NAHB
RESEARCH
CENTER
BUILDER
PRACTICES
REPORT
201
X
PREPARED BY:
- 74
Phone: 301 -
F3X-.30V430-618C
www.nahbrc.com
BUILDER PRACTICES REPORT
RADON-RESISTANT
CONSTRUCTION PRACTICES
IN NEW U.S. HOMES
2011
Prepared for
U.S. Environmental Protection Agency
Indoor Environments Division
1200 Pennsylvania Avenue, NW
Washington, DC 20460
Prepared by
NAHB Research Center, Inc.
400 Prince George's Boulevard
Upper Marlboro, MD 20774
www.nahbrc.com
Annual Builder and
Consumer Practices Surveys
October 2012
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Mission Statement
The NAHB Research Center's mission is to promote innovation in housing technology to
improve the quality, durability, affordability, and environmental performance of homes and home
building products.
About the NAHB Research Center
Created in 1964 as a subsidiary of the National Association of Home Builders (NAHB), the
NAHB Research Center has established itself as an important source for reliable, objective
information and research on housing construction and development issues.
Disclaimer
Neither the NAHB Research Center, Inc., nor any person acting in its behalf, makes any
warranty, express or implied, with respect to the use of any information, apparatus, method, or
process disclosed in this publication or that such use may not infringe privately owned rights, or
assumes any liabilities with respect to the use of, or for damages resulting from the use of any
information, apparatus, method, or process disclosed in this publication, or is responsible for
statements made or opinions expressed by individual authors.
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BUILDER PRACTICES REPORT
RADON-RESISTANT CONSTRUCTION PRACTICES
IN NEW U.S. HOMES
2011
Prepared for:
U.S. Environmental Protection Agency
Indoor Environments Division
1200 Pennsylvania Avenue, NW
Washington, DC 20460
Prepared by:
NAHB Research Center, Inc.
400 Prince George's Boulevard
Upper Marlboro, MD 20774
www.nahbrc.com
Annual Builder and Consumer Practices Surveys
October 2012
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TABLE OF CONTENTS
INTRODUCTION 1
GEOGRAPHIC SAMPLING 2
METHODOLOGY 3
STATISTICAL ESTIMATES 4
DETAILED DATA TABULATIONS 5
REPORT DATA TABLES 6
WEIGHTING PROCEDURES FOR TABULATIONS 7
DEMOGRAPHIC SAMPLING 8
BUILDERS AND THEIR HOMES 9
CHARACTERISTICS OF NEW SINGLE-FAMILY DETACHED HOMES 10
RESIDENTIAL STRUCTURE TYPES 12
HOUSING DESIGNS 13
FOUNDATION TYPES 15
OVERVIEW OF THE RESULTS 16
SIZE OF BUILDERS IN THE RADON SAMPLE 16
RADON REDUCING FEATURES IN SINGLE-FAMILY DETACHED HOUSING 18
RADON REDUCING FEATURES IN MULTIFAMILY HOUSING 20
SUBSLAB PREPARATION IN SINGLE-FAMILY DETACHED HOMES 20
SEALING METHODS IN SINGLE-FAMILY DETACHED HOMES 20
COSTS OF INSTALLING PASSIVE OR ACTIVE SUB-SLAB OR SUB-MEMBRANE VENTILATION 21
Appendix A: Single-Family Detached Usage Coefficient Tables by the Nine Census Divisions
Appendix B: Multifamily Usage Coefficient Tables by the Nine Census Divisions
Appendix C: Single-Family Detached Usage Coefficient Tables by the 32 State-Market-Areas
Appendix D: Single-Family Detached Usage Coefficient Tables by the Three Radon Exposure Zones
Appendix E: Multifamily Usage Coefficient Tables by the Three Radon Exposure Zones
Appendix F: Single-Family Detached Product Usage Tables by the Three Radon Exposure Zones
Appendix G: Total Product Usage Tables for All Houses by the Three Radon Exposure Zones
Appendix H: Annual Builder Practices Questionnaire
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LIST OF FIGURES
FIGURE 1: UNITED STATES CENSUS DIVISION MAP 2
FIGURE 2: SAM RLE OF THE RADON COEFFICIENT TABLES 6
FIGURE 3: DISTRIBUTION OF NEW SINGLE-FAMILY DETACHED HOMES BY PRICE-POINT, 2009 TO 2011... 9
FIGURE 4: AVERAGE SIZE OF SINGLE-FAMILY DETACHED HOMES BY PRICE-POINT, 2009 TO 2011 10
FIGURE 5: AVERAGE PRICE OF SINGLE-FAMILY DETACHED HOMES BY PRICE-POINT, 2009 TO 2011 11
FIGURE 6: DESIGN OF SINGLE-FAMILY DETACHED HOMES BUILT FROM 2009 TO 2011 13
FIGURE 7: FOUNDATION TYPES IN SINGLE-FAMILY DETACHED HOMES BUILT FROM 2009 TO 2011 15
FIGURES: COMPOSITION OF RADON SAMPLE BY HOMES PER BUILDER PER YEAR, 2009 TO 2011 16
FIGURE 9: COMPOSITION OF ZONE 1 SINGLE-FAMILY DETACHED HOUSES WITH RADON-REDUCING
FEATURES 17
FIGURE 10: RADON-REDUCING FEATURES IN SINGLE-FAMILY DETACHED HOUSES BY CENSUS DIVISION 19
LIST OF TABLES
TABLE 1: BUILDER PRACTICES SURVEY RESPONSES BY REGION 3
TABLE 2: ANNUAL BUILDER PRACTICES SURVEY DISTRIBUTION OF ALL RESPONSES BY CENSUS
DIVISION 8
TABLES: COMPOSITION OF ZONE 1 SAMPLE BY SIZE OF BUILDER 17
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BUILDER PRACTICES REPORT Radon-Resistant Construction Practices
INTRODUCTION
The NAHB Research Center's Builder Practices Reports provide a comprehensive look into new
home characteristics and the products and materials purchased by home builders nationwide. The
reports are based on data obtained through the Annual Builder Practices Survey, a nationally
disseminated paper survey of home builders. The resulting data are tabulated using a robust
methodology that includes balancing on geographic and demographic variables to provide an
accurate picture of the characteristics of homes built each calendar year.
The Builder Practices Reports present data on materials purchased for single-family detached
homes and Multifamily dwelling units. These data are shown as "coefficients," which are per-
house averages, and "product usage," which is the total volume of homes with certain
characteristics built in each geographic area.
Coefficients for single-family detached homes are calculated for 32 separate U.S. geographic
areas, referred to as "State-Market-Areas", which are individual states, portions of states, or
clusters of states with similar geography and climate. States with relatively low housing starts
have been grouped with another state or states to create one State-Market-Area, while three
states with a high level of new home construction activity (California, Florida, and Texas) are
split into two State-Market-Areas. Where a state is split, the dividing line typically occurs along
changes in climate, topography, or dominant construction practices, and always along county
lines. This generally assures that geographic similarities, climatic characteristics, or architectural
preferences are maintained within a distinct reporting area.
The data are reported by 32 State-Market-Area data for single-family detached dwellings, by 9
Census Divisions and national totals for both multifamily and single-family detached dwellings.
Weights are assigned to each record, based on either housing starts or number of radon-
resistant construction systems installed, to assure larger builders get proportionally greater
weight than smaller builders. Further, totals for each 32 State-Market-Area receive weights that
are proportional to their housing starts when calculating averages for each of the nine U.S.
Census Divisions. U.S. averages are a weighted total of the nine Census Divisions. Data are
also presented for the three Radon Exposure Zones established by the United States
Environmental Protection Agency.
The Multifamily data, which include single-family attached dwellings (Apartments, Duplexes,
Townhouses and Row Houses) are tabulated by the nine U.S. Census Divisions and by the
three Radon Exposure Zones. National coefficients are weighted averages of coefficients at the
Census Division, weighted by the proportion of multifamily starts they represent to total U.S.
multifamily starts.
Historic and forecasted housing starts are provided by the National Association of Home
Builders and are based on U.S. Census Bureau data.
Product Usage is the total estimated volume or amount of material used and is tabulated by the
three Radon Exposure Zones and the U.S. as a whole. One set of tabulations presents data for
both single-family and multifamily dwellings and another set of tabulations presents data for only
single-family detached dwellings. These data are estimated using the coefficients described
previously, along with the housing start data for each Radon Exposure Zone. Product usage
data are calculated for each zone and summed to produce totals for the U.S. as a whole.
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BUILDER PRACTICES REPORT
Radon-Resistant Construction Practices
GEOGRAPHIC SAMPLING
The data are presented by geographic areas established by the U.S. Census Bureau in 1910,
called Census Divisions. The Census Divisions include all 50 states, and the District of
Columbia. The nine U.S. Census Divisions are shown in Figure 1 below.
Figure 1: United States Census Division Map
The 32 State-Market-Areas established by the NAHB Research Center are listed below within their
respective Census Divisions. Numbers is parenthesis show percentage of single-family detached
housing starts for each State-Market-Area within its Census Division:
New England
• Connecticut, Massachusetts, and Rhode Island (63.2%)
• Maine, New Hampshire, and Vermont (36.8%)
Mid-Atlantic
• New Jersey (23.9%)
•New York (29.1%)
• Pennsylvania (47.0%)
South Atlantic
• Delaware, Maryland and District of Columbia (9.9%)
• Northern Florida (Tampa and north) (17.7%)
• Southern Florida (south of Tampa) (10.9%)
• Georgia (12.6%)
• North Carolina and South Carolina (33.5%)
• Virginia and West Virginia (15.5%)
East North Central
•Illinois (17.2%)
• Indiana (23.4%)
•Michigan (19.8%)
• Ohio (23.0%)
•Wisconsin (16.5%)
East South Central
• Alabama and Mississippi (44.1%)
• Kentucky and Tennessee (55.9%)
West North Central
• Iowa and Nebraska (31.6%)
• Kansas and Missouri (32.1%)
•Minnesota (21.7%)
• North Dakota and South Dakota (14.5%)
West South Central
• Arkansas and Oklahoma (12.1%)
• Louisiana and East Texas (Houston to Corpus
Christi, and west to the semi-arid plains) (42.6%)
• West Texas (Dallas to San Antonio and west) (45.3%)
Mountain
• Arizona, Nevada, and New Mexico (46.7%)
• Colorado and Utah (38.6%)
• Idaho, Montana, and Wyoming (14.7%)
Pacific
•Northern California (counties north of Kern,
San Luis Obispo, and San Bernardino) (24.2%)
•Southern California (Kern, San Luis Obispo, San
Bernardino and south: the ten southern-most
counties) and Hawaii (32.2%)
•Oregon (11.1%)
•Washington and Alaska (32.5%)
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BUILDER PRACTICES REPORT
Radon-Resistant Construction Practices
METHODOLOGY
In order to gather data for the material usage coefficients, the NAHB Research Center mailed the
Annual Builder Practices Survey to nearly 29,500 active home building companies nationwide. The
sample frame was generated randomly from a pool of NAHB members who indicated that new
home construction was their primary occupation. Over 900 questionnaires were sent to companies
in each of the 32 State-Market-Areas. Approximately 1,400 usable responses were received for the
2011 survey where 1,323 respondents reported building single-family detached homes and 160
reported building multifamily dwellings (Apartments, Duplexes, and Single-Family Attached -
Townhouses and Row Houses). The survey design enabled individual builders to respond
separately to questions about Single-Family Detached as well as multifamily dwellings. The
number of responses, by geography, is illustrated in Table 1.
Counts by Census Division and 32 State-Market-Area
New England
CT, MA, Rl
ME, NH, VT
Mid-Atlantic
NJ
NY
PA
East North Central
IL
IN
Ml
OH
Wl
91
60
31
131
32
43
56
207
34
47
48
37
41
West North Central
IA, NE
KS, MO
MN
ND, SD
East South Central
AL, MS
KY, TN
South Atlantic
DE, MD, DC
North FL
South FL
GA
NC, SC
VA, WV
179
43
43
52
41
106
49
57
271
41
52
28
44
64
42
West South Central
AR, OK
LA & East TX
West TX
Mountain
AZ, NV, NM
CO, UT
ID, MT, WY
Pacific
North CA
HI, South CA
OR
WA, AK
165
47
44
74
95
28
37
30
142
25
27
37
53
Table 1: Builder Practices Survey Responses by Region
Since numerous U.S. home building companies have multiple offices throughout the country, each
local building establishment of multi-regional and national firms is recognized as a separate entity.
Hence, questionnaires were sent to local home building establishments, not to regional offices or
national headquarters. To assure that local offices are reporting only on homes built by their own
operations and not the homes constructed by operations in other areas, the programming
methodology allows a maximum of 120 single-family detached homes built by a respondent's local
operation and 250 single-family attached homes and multifamily dwellings.
To encourage participation, respondents were offered a selection of gift choices valued at about
$20. Discounting a percentage of surveys that were undeliverable, that reached non-builders or
multiple persons within a single company, the overall response rate was six percent.
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BUILDER PRACTICES REPORT Radon-Resistant Construction Practices
STATISTICAL ESTIMATES
The uncertainty in the estimates presented in this report generally decreases as the sample size
increases. The underlying distribution of survey responses is either binomial or multinomial in
nature, so the standard deviation of any proportion p estimated from the survey is:
n
where: ap = the standard deviation of the estimated proportion,
P= the true proportion, and
n = the sample size (number of responses).
Based on a normal approximation to the binomial distribution, a symmetrical 95 percent
confidence interval estimate of the true proportion P would be:
P=p±(1.96 x crp)
While p for the sample is known, the true proportion P is unknown, so ap cannot be computed
exactly. Still, a reasonable approximation can be made by using the observed proportion p to
estimate ap. For example, a 95 percent confidence interval for P, for the inclusion of two car
garages in single-family detached houses built in the United States, based on a sample size of
n = 1,323 builders and an observed usage rate of p = 0.540 (or 54.0 percent), would be
computed as follows:
^
1,323
As a result, the 95 percent confidence interval is:
P = 0.540 ± (1.96x0.0137), or 0.5131 25 and p is not too
close to 0 or 100 percent. Other methods can be used to compute confidence intervals where
these conditions are not met.
Usage rates can be interpreted as proportions of a total, and confidence limits for the proportion
multiplied by the total may be used to derive a confidence limit for the coefficient.
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BUILDER PRACTICES REPORT Radon-Resistant Construction Practices
DETAILED DATA TABULATIONS
This report, Radon-Resistant Construction Practices in New U.S. Homes, includes eight
appendices that contain general and detailed radon-related construction data calculated from
builders' responses.
& Appendix A: contains data on the usage rates of radon-reducing features for single-
family detached houses for each of the nine Census Divisions and the U.S. Total.
• Appendix B: contains data on the usage rates of radon-reducing features for
multifamily (townhouses and apartments) housing units for each of the nine Census
Divisions and the U.S. Total.
£ Appendix C: contains data on the usage rates of radon-reducing features for single-
family detached houses for the 32 State-Market-Areas.
£ Appendix D: contains data on the usage rates of radon-reducing features for single-
family detached houses for each of the three EPA Radon Exposure Zones and the
U.S. Total.
• Appendix E: contains data on the usage rates of radon-reducing features for
multifamily housing units (Apartments, Duplexes, and Single-family Attached -
Townhouses and Row Houses) for each of the three EPA Radon Exposure Zones
and the U.S. Total.
• Appendix F: contains product usage data for single-family detached houses for the
three EPA Radon Exposure Zones and the United States as a whole.
£ Appendix G: contains product usage data for all representative houses for the three
EPA Radon Exposure Zones and the United States as a whole.
• Appendix H: contains a copy of the 2011 Annual Builder Practices Survey
questionnaire used to gather the information from home builders.
The data tables that accompany this report present the usage coefficients and product usage for
radon-reducing features in new homes. The tabulations are for both single-family detached and
multifamily housing. Multifamily data include townhouses and duplexes (both are called "single
family attached" in this report), apartments, and condominiums.
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BUILDER PRACTICES REPORT
Radon-Resistant Construction Practices
REPORT DATA TABLES
Figure 2 provides an example of the general layout of each of the data tables of coefficients
presented in Appendices A through E.
The first page of the material usage coefficient tables in Appendices A though C contains an
overview of the radon-reducing features of new homes based on the results gathered from the
2011 survey. Near the top of Page 1 of each table (except Product Usage tables) is a section
titled "Sample Size" (©) for that table which summarizes the house-building activity for the
sample of respondents in the survey year who answered the radon-related questions, followed
by the number of units in the sample (®) and the number of builders represented in the sample
The lines that follow on Page 1 of the example show the distribution of homes built with and
without radon-reducing features in one-story homes within each foundation type (®), and the
coefficient for each (®). The data continues beyond this example to include two- and three-story
houses, as well as a summary by foundation type and a total for all dwellings. The bottom row,
or Total, is the sum of all coefficients in that category (®). In Appendices A and B, data are
given for each of the nine Census Divisions. The example below shows the New England, Mid-
Atlantic, and East North Central Census Divisions (©). The six additional Census Divisions are
found further to the right on the same page. In Appendix C, data are given for each of the 32
State-Market-Areas and the nine Census Divisions. Appendices D and E provide the data for
each of the three EPA Radon Exposure Zones for single-family detached houses and
multifamily dwellings.
BUILDER PRACTICES REPORT
Copyright 201 2, NAHB Research Center, Inc.
SAMPLE SIZE ®
Units ®
Builders (3)
WEIGHTED AVERAGE UNITS PER
TYPE OF HOUSE: WITH RADON-REDUCING
One Story Dwellings With Basements ®
With radon-reducing features
No radon-reducing features
One Story Dwellings With Crawl Spaces ®
With radon-reducing features
No radon-reducing features
One Story Dwellings On Slabs ®
With radon-reducing features
No radon-reducing features
ONEWENG
186
81
2.3
FEATURES
CD
7.8%
29.2%
0.0%
0.4%
2.8%
2.1%
® MID ATL
354
121
2.9
®
6.1%
29.0%
0.0%
1 .3%
0.3%
1 .8%
1
® E N CEN
871
199
4.4
®
12.1%
35.5%
3.9%
3.7%
0.3%
6.0%
•
Houses on piers ®
TOTAL ®
0.5%
©100.0%
0.6%
100.0%
0.3%
100.0%
Figure 2: Sample of the Radon Coefficient Tables
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BUILDER PRACTICES REPORT Radon-Resistant Construction Practices
The subsequent pages of each set of data tables follow this format and present additional
tabulations. Page 2, for example, shows tabulations for houses tested for radon by foundation type,
radon-reducing features by construction method, and radon-reducing features by size of builder.
Page 3 continues by providing a breakout of the different methods employed to reduce radon in
houses with basements, crawl spaces, and slabs and includes tabulations of sealing methods used
in basements and slabs. Page 4 gives data on the methods used in the sub-slab preparation of
basements and slabs and the sum of both foundation types. Finally, Page 5 shows results for the
estimated costs for builders to include radon-reducing design features.
WEIGHTING PROCEDURES FOR TABULATIONS
In Appendices A through E, data for single-family detached homes are presented as averages of
builder responses for each of the 32 State-Market-Areas with each response weighted by the
number of homes constructed in 2011. Multifamily data are presented as weighted averages of
each of the nine U.S. Census Divisions. When combined to create Census Division or U.S. totals,
individual State-Market-Area and Census Division averages for single-family detached homes are
weighted by the number of housing starts in each geographic area (except in Appendices D and E,
see below). For example, Pennsylvania had 47.0 percent of all single-family detached (SFD) starts
in the Mid-Atlantic States in 2011; and new SFD home starts in Mid-Atlantic were 6.0 percent of
total U.S. SFD starts. Consequently, the Pennsylvania average has a weight of 2.8 percent when
developing U.S. total averages (47.0% x 6.0% = 2.8%).
In Appendices D and E, the coefficients by Radon Zone for single-family detached and multifamily
homes, the data are presented as weighted averages of the responses from each of the three
Radon Zones. These are weighted by the number of homes constructed per respondent but are
not weighted by the number of starts in each geographic area within a Radon Zone. Therefore,
weighting the zones tabulations by housing starts to achieve the U.S. totals would produce results
different from the U.S. totals reported here.
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BUILDER PRACTICES REPORT
Radon-Resistant Construction Practices
DEMOGRAPHIC SAMPLING
The complete Annual Builder Practices Survey respondent database for 2011 includes 1,323
builders who constructed 9,051 SFD homes, and 160 builders of 4,443 multifamily units.
Builders in the sample ranged from those who constructed a single home in 2011 to national
companies whose combined regional and local offices built thousands of homes in 2011.
The distribution of all Single-family Detached homes built by survey respondents, in each Census
Division, measured by housing units, is compared to national housing start activity in 2011, and is
shown in Table 2. Any differences between the survey sample and actual starts are corrected
by the weighting procedure explained previously.
Census Division Percent of 201 1 Sample Percent of 201 1 Starts
New England
Mid-Atlantic
East North Central
West North Central
South Atlantic
East South Central
West South Central
Mountain
Pacific
United States Total
2.7%
5.1%
13.4%
10.9%
21 .5%
9.6%
20.7%
5.8%
10.3%
100.0%
2.7%
6.0%
9.8%
7.5%
26.5%
7.0%
20.5%
9.5%
10.5%
100.0%
Table 2: Annual Builder Practices Survey Distribution of All Responses by Census Division
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BUILDER PRACTICES REPORT
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BUILDERS AND THEIR HOMES
AVERAGE UNITS PER BUILDER IN 2011
In 2011, the average number of homes constructed by single-family detached (SFD) builders in
the entire survey sample was 6.8. In 2010 and 2009, the averages were 6.9 and 8.5 homes per
respondent.
The average single-family attached/multifamily builder in the sample constructed 27.8 units. In
2010 and 2009, the averages were 28.9 and 24.1 units per respondent.
PRICE DISTRIBUTION OF SINGLE-FAMILY DETACHED HOMES IN 2011
The Builder Practices Survey routinely gathers information on the average square footage and
sales price of starter, move-up, and luxury homes built in the survey year. Figure 3 shows the
percentage distribution of all single-family detached homes built along these price-points (i.e.,
starter, move-up, and luxury) for 2011, 2010, and 2009.
Figure 3 shows the distribution by starter, move-up, and luxury home categories, for the past
three years.
Price Distribution of Single Family Detached Homes
Luxury
Move-Up
18.3%
14.6%
16.7%
39.8%
| 47 '
41 .9%
41 .9%
Starter
38.0%
41.4%
0.0%
10.0%
20.0%
30.0%
40.0%
50.0%
Figure 3: Distribution of New Single-family Detached Homes by Price-Point, 2009 to 2011
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BUILDER PRACTICES REPORT
Radon-Resistant Construction Practices
CHARACTERISTICS OF NEW SINGLE-FAMILY DETACHED HOMES
AVERAGE SIZE OF NEW HOMES
Results from the Annual Builder Practices Survey show that the average size of new single-
family detached homes in the sample for 2011 was 2,443 square feet, up from 2010 (2,249
square feet) and 2009 (2,235 square feet).
Figure 4 shows the results by starter, move-up, and luxury home categories, for the past three
years.
Luxury
Move-Up
Starter
Average Size of Single Family Detached Homes
1,615
1,550
1,550
2,345
2,2
2,!
91
03
3,908
3,766
3,71
3
500
1000
1500
2000
2500
3000
3500
4000
4500
Figure 4: Average Size of Single-family Detached Homes by Price-Point, 2009 to 2011
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BUILDER PRACTICES REPORT
Radon-Resistant Construction Practices
AVERAGE PRICE OF NEW HOMES
In 2011, a new single-family detached home (including land) averaged $348,516. In 2010 the
average price of a new single-family detached home was $323,061, and in 2009 it was $301,607.
Figure 5 gives average prices for starter, move-up, and luxury homes, for the past three years.
Luxury
Move-Up
Starter
$100
Average Price of Single Family Detached Homes
$733,28
$721 ,487
$663,364
$166,617
$165,664
$161,089
$293,215
$292,454
$283,859
,000 $300,000 $500,000 $700,000
D2011
5
D2010
• 2009
Figure 5: Average Price of Single-family Detached Homes by Price-Point, 2009 to 2011
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BUILDER PRACTICES REPORT Radon-Resistant Construction Practices
RESIDENTIAL STRUCTURE TYPES
Just as in previous reports regarding radon-reducing features in new construction and all Builder
Practices Reports, "single-family detached" is defined as a single dwelling unit that does not
share any common walls or foundation with another dwelling unit.
"Single-family attached" are generally defined as sharing one or more common walls, with each
unit resting on a separate foundation. "Multifamily" dwellings, on the other hand, are defined as
sharing a common foundation with another unit. Typically, both single-family attached and
multifamily units require two-hour fire-rated walls between buildings. However, multifamily units
generally have one-hour fire rated floors and walls between units in some buildings.
This study uses the term multifamily housing to refer to all structures that contain more than one
dwelling unit. It also combines into one category the market segment that was, prior to 1994,
differentiated into single-family attached and multifamily low-rise units. This was done in order to
assure a sufficient number of responses for reliable estimates.
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BUILDER PRACTICES REPORT
Radon-Resistant Construction Practices
HOUSING DESIGNS
SINGLE-FAMILY DETACHED HOUSING DESIGNS
Single-family detached housing tabulations are disaggregated into one-, two-, and three-story
houses. In 2011, the share of one story homes continued to represent more than half of all new
homes.
Figure 6 shows the national levels of all of these single-family detached housing designs, for the
past three years.
One-story
Two-story
Three-story and
On piers
O.C
Housing Design of Single Family Detached Homes
| 55.9%
| 53.2%
| 54.8%
| 42.2%
| 44.7%
| 43.8%
] 1.9%
] 2.1%
| 1.4%
D2011
• 2010
• 2009
)% 20.0% 40.0% 60.0% 80.0%
Figure 6: Design of Single-family Detached Homes Built from 2009 to 2011
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BUILDER PRACTICES REPORT Radon-Resistant Construction Practices
MULTIFAMILY HOUSING DESIGNS
In this study, a multifamily unit is defined as a townhouse, duplex, or apartment and is generally
less costly to construct than a single-family detached house by sharing foundations and roof
structures. They further conserve building materials with adjoining walls between units and are
typically built at higher densities to conserve land cost. The average multifamily unit is smaller than
a single-family detached house. In 2011, the average multifamily dwelling had 1,360 square feet of
finished space with an average selling price of $204,424 (including land).
Due to the relationship between radon level and proximity of the living unit (apartment) to the
ground, the data are presented separately by percentage of living units located on the first, second,
and third floors. To calculate the number of living units on the first, second, and third floors, the
assumption is made that half of the units of a two-story multifamily building are on the first floor,
and half the units are on the second floor. In a three-story multifamily building, one-third of the units
is credited to being on each of the first, second, and third floors.
Townhouses, which are also known as single-family attached houses, are included in the
multifamily count. They are also tabulated according to the number of stories they have. In 2011,
one-story townhouses accounted for 34.1 percent, two-story townhouses for 43.5 percent, three-
story townhouses for 22.3 percent.
NAHB Research Center, Inc. Page 14
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BUILDER PRACTICES REPORT
Radon-Resistant Construction Practices
FOUNDATION TYPES
Foundation types in the radon samples are shown in Figure 7 below for 2011, 2010, and 2009.
The incidence of pier foundations is reported in the data tables, but they are excluded from the
analysis of radon-venting practices.
Foundation Types in Single Family Detached Homes
Piers
Slabs
Crawl Spaces
Basements
1 .6%
1 .6%
1 .2%
I 44.4%
49.8%
I 53.2%
I 15.3%
I 10.5%
I 10.5%
I 38.7%
I 3
I 35.1%
8.2%
D2011 D2010
• 2009
0.0% 10.0% 20.0% 30.0% 40.0% 50.0% 60.0%
Percent of single family detached homes in radon sample
Figure 7: Foundation Types in Single-family Detached Homes Built from 2009 to 2011
The Builder Practices Survey questionnaire asks if a house has a split foundation - partially
basement and partially slab or crawlspace. If a house has a partial basement, it is included in
the basement count. This considered, 51.9 percent of single-family detached dwellings with
basements built in 2011 were two- or three-story homes. This may be considered important
because bedrooms are generally located on the upper floor(s) of a house and therefore furthest
from the basement.
Among the EPA Radon Zones, Zone 1 has the greatest likelihood of radon occurrence. In 2011
about 26.0 percent of all new U.S. single-family detached homes were built in Zone 1, 29.5
percent in Zone 2, and 44.5 percent in Zone 3. The breakdown by foundation types shows that
78.2 percent of single-family detached homes built in 2011 in Zone 1 had basements. This is
compared to 79.7 percent in 2010 and 75.9 percent in 2009. In contrast, only 9.6 percent of
single-family detached homes built in Zone 3 had basements compared to 6.1 percent in 2010
and 9.5 percent in 2009.
Of all single-family detached homes built in Zone 1 in 2011, 8.5 percent had concrete slab
foundations. In comparison, slab foundations accounted for 10.6 percent in 2010 and 13.0
percent in 2009. In Zone 3, 74.6 percent of all single-family detached homes built in 2011 had
concrete slab foundations compared to 84.9 percent in 2010 and 80.0 percent in 2009.
NAHB Research Center, Inc.
Page 15
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BUILDER PRACTICES REPORT
Radon-Resistant Construction Practices
OVERVIEW OF THE RESULTS
This report includes detailed tabulations of the use of various radon-reducing methods in new
home construction, the preparation of the sub-slab in basements and slabs, and the sealing
methods in basements, crawl spaces, and slabs.
In 2011, 16.6 percent of all new single-family detached homes, excluding those on piers, included
a radon-reduction system. In 2010, this number was 16.8 percent, and was 13.7 percent in 2009.
Installation of radon-reducing features in multifamily buildings in 2011 was 19.4 percent, up from
15.3 percent in 2010 and even 10.7 percent in 2009. This continues the long-term trend of flat to
upward movement in radon-reducing feature installation in new residential construction.
SIZE OF BUILDERS
Single-family detached home builders were classified into four groups according to the number of
units they built in a single year. Figure 8 shows the sample composition according to the percent of
single-family detached houses built for the years 2009, 2010, and 2011.
Overall, the average size of builder, measured by annual housing starts, has declined somewhat
over the past year.
Size of Builder of Single Family Detached Homes
Over 100
26 to 100
1 1 to 25
1 to 10
0.0% 10.
I 14.3%
I
19.7%
I 23.7%
I 21.2%
I 25.3%
I 26.
I 13.2%
I 13.2%
I 13.4%
!%
I 51.4%
I 41.8%
n
| 36.1
%
0% 20.0% 30.0% 40.0% 50.0% 60.
Percent of single family detached homes in sample
a 2011
• 2010
• 2009
0%
Figure 8: Composition of Radon Sample by Homes per Builder per Year, 2009 to 2011
NAHB Research Center, Inc.
Page 16
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BUILDER PRACTICES REPORT
Radon-Resistant Construction Practices
Zone 1: Percent of Builders in Sample by Size of Builder: The table below shows the
composition of the sample for single-family detached dwellings constructed in Zone 1 by size of
builder.
2010
2009
53.5%
44.1%
20.2%
15.3%
11.8%
26 to 100
15.6%
20.3%
21.4%
Over 100
8.7%
11.0%
22.7%
Table 3: Composition of Zone 1 Sample by Size of Builder
Builders in Zone 1 Using Radon-Reducing Features
Over 100
26 to 100
1 1 to 25
1 to 10
| 6.8%
0.0%
I 27.7%
I 15.8%
I 26.5%
I 12.5%
I 23.1%
I 23.4%
I 15.60/
'„
I 54.3%
| 44.1%
50.1%
-10.0% 0.0% 10.0% 20.0% 30.0% 40.0% 50.0% 60.0%
Percent of Zone 1 Single Family Detached Homes with Radon-Reducing Features
Figure 9: Composition of Zone 1 Single-family Detached Houses with Radon-Reducing Features
Zone 1: Percent of Builders Using Radon-Reducing Features, by Size of Builder: Figure 9
shows the distribution of single-family detached dwellings built with radon-reducing features in
Zone 1 by builders in each size category.
NAHB Research Center, Inc.
Page 17
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BUILDER PRACTICES REPORT Radon-Resistant Construction Practices
RADON-REDUCING FEATURES IN SINGLE-FAMILY DETACHED HOUSING
A permeable layer under a basement or an on-grade slab can be vented to reduce the entry of
radon gas into the home. The majority of new U.S. homes has at least four inches of gravel or
crushed stone as a base for their concrete floors. However, to qualify as having radon-reducing
features, a house must have either a passive stack ventilation pipe or an active system (fan-
driven). Starting in 2004, "rough-in for future installation of a ventilation stack" no longer qualifies in
this report as a radon-reducing feature. The rough-in itself does not reduce the level of radon, but it
does allow for low-cost venting of the sub-slab cavity in the event that post-construction testing
finds high levels of radon in the completed home.
In 2011, this study showed that 16.6 percent of new single-family homes had radon-reducing
features, down slightly from 16.8 percent in 2010. Passive stack depressurization systems in
U.S. single- family detached homes in 2011 had a reported usage rate of 13.9 percent. This is
an down from reported usage rates in 2010 of 15.3 percent and 11.1 percent in 2009. Fan-
driven sub-slab depressurization or ventilation of single-family detached homes built in 2011
was 2.7 percent, up from rates of 1.5 percent in 2010 and 2.6 percent reported in 2009.
While not included in the total share of homes with radon-reducing features, roughed-in systems
were found in 8.1 percent of the single-family detached houses in the 2011 radon sample of
homes with a basement or slab, up from 5.3 percent in 2010.
Radon-reducing features continue to be more prevalent in single-family detached homes with
basements than with any other type of foundation. In 2011, 30.5 percent of single-family homes
with basements were reported to have radon-reducing features, compared to 13.1 percent of
homes built on crawlspace foundations and 5.9 percent built on concrete slab foundations. Further,
25.2 percent of single-family detached homes with basements reported having passive stack sub-
slab ventilation installed; fan-driven sub-slab depressurization was installed in 5.3 percent of
homes with basements. In single-family detached homes built on concrete slab foundations,
passive and active systems were installed at rates of 5.3 percent and 0.5 percent, respectively.
Rough-ins for sub-slab ventilation were installed in 19.9 percent of single-family detached homes
with basements and in 0.8 percent of single-family detached homes built on slabs in 2011.
NAHB Research Center, Inc. Page 18
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BUILDER PRACTICES REPORT
Radon-Resistant Construction Practices
Figure 10 shows the incidence of radon-reducing features across the nine Census Divisions for all
single-family detached houses (excluding pier foundations).
Radon-Re
Pacific
Mountain
West South Central
East South Central
South Atlantic
West North Central
East North Central
Mid Atlantic
New England
0(
ducing Features in Single Family Detached Houses by Census Division
—
i
I 7 .;
1 1
>%
L
~U 7.2
~l 6.£
d 1.8%
• 1.3%
• 1.4%
>%
%
14.5%
I
I
• 11. C
13.9%
%
I 16.1
1
• 11.2
14.6%
%
19.3%
1
%
24.2%
1 40.4U/
I 40.6"
I 26.1
5%
1
I
1 ^
24.7%
'3.5%
34.7%
1
1 Z
1 1
8.2%
2.8%
29.4%
28.9%
39.4%
'o
h
|
49.2%
D2011
D2010
• 2009
/o 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55%
Figure 10: Radon-Reducing Features in Single-family Detached Houses by Census Division
A very important consideration is the distribution of radon-reducing features within the three EPA
Radon Exposure Zones1, with much higher inclusion rates of radon-reducing measures in zones
with greater radon exposure. In 2011, shares of new single-family homes (excluding those on pier
foundations) with radon-resistant features in Zones 1, 2 and 3 were 38.2, 21.8, and 3.9 percent,
respectively. This correlates well with 2010 survey results, where shares of single-family detached
homes with radon-reducing features in Zones 1, 2 and 3 were 40.1, 17.9, and 2.1 percent,
respectively.
1 Zone assignment is based on the county where builder constructed most of their homes.
NAHB Research Center, Inc.
Page 19
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BUILDER PRACTICES REPORT Radon-Resistant Construction Practices
RADON-REDUCING FEATURES IN MULTIFAMILY HOUSING
The overall incidence of radon-reducing features in multifamily living units and townhouses without
pier foundations was 19.4 percent in 2011 compared to 15.3 percent in 2010. Like single-family
homes, multifamily homes in zones with higher likelihood of exposure were more likely to have
radon-resistant features. In 2011 the share of units in Zone 1 with radon-resistant features was
29.5 percent; in Zone 2, the rate was 18.2 percent; and, in Zone 3, the rate was 5.0 percent which
is up from 2010, where the share of units in Zones 1, 2 and 3 were 18.9, 16.0, and 1.9 percent,
respectively, with an increase in every zone.
SUBSLAB PREPARATION IN SINGLE-FAMILY DETACHED HOMES
Reducing radon levels in a house generally requires providing a permeable layer under the
basement or first floor slab that can be vented or depressurized in order to remove the radon gas
that originates in the surrounding soil. A vent exhausts the radon gas into the outside air so that it
will not be drawn into the basement or finished living area. For basement and slab foundations, the
layer is typically created by spreading four inches or more of gravel or crushed stone before the
foundation is poured. Four inches of gravel or stone base is standard construction practice for
drainage purposes in many areas of the country, making the incremental cost of a full radon-
resistant system significantly lower.
For single-family detached homes in the United States in 2011, four inches or more of aggregate
was used in 56.3 percent of the single-family detached homes with basements or slabs. This
compares to 52.6 percent in 2010 and 46.1 percent in 2009.
The use of crushed aggregate increases as the risk of radon exposure rises. In Zone 1, the usage
rate of four inches or more of aggregate under basements and slabs for single-family detached
homes was 82.0 percent, compared to 70.3 percent in Zone 2 and 25.7 percent in Zone 3. This
relationship held true for the years 2010 and 2009 as well.
SEALING METHODS IN SINGLE-FAMILY DETACHED HOMES
While polyethylene and other membranes placed directly beneath a concrete slab-on-grade floor
are useful in radon-reduction, they are primarily used as vapor barriers to keep moisture from
wicking from the ground, through the concrete floor, and into the home. In both basement and slab
foundation dwellings, the placement of a membrane on top of the ground surface or aggregate
before the slab is poured is the most frequently employed sealing method. The membrane is most
commonly a 6-mil polyethylene sheet. Not only does the membrane provide a seal for the ground
floor, it keeps the concrete from seeping into the crushed aggregate during the pour so that the
crushed rock produces an effective air cavity.
Nationally, the percent of single-family detached homes with basements that used a polyethylene
or other membranes under the concrete slab floor specifically for the purpose of sealing the slab
against radon increased to 57.0 percent in 2011, up from 52.8 percent in 2010 and also up from
35.6 percent in 2009.
In single-family detached homes with slabs, 44.7 percent used a polyethylene or other membrane
under the concrete slab to seal the slab against radon. In 2010, 42.7 percent used this method and
35.7 percent used this method in 2009. An interesting note here is that builders reported using a
plastic or other vapor barrier that was not necessarily related to radon gas reduction in 66.3 percent
of the sample. This compares to 70.9 percent and 54.1 percent in 2010 and 2009 respectively.
NAHB Research Center, Inc. Page 20
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BUILDER PRACTICES REPORT Radon-Resistant Construction Practices
Less common, but used in conjunction with a vapor barrier membrane, is caulking around the slab
edges, wall and floor openings, and joints. As concrete ages, it contracts slightly, so joints that
were originally flush may form small gaps. Because most of this shrinkage occurs during the first
several weeks, caulking a foundation toward the end of a home's construction cycle will more
properly seal any gaps that develop.
In 2011, 16.5 percent of the single-family detached houses with basements were sealed with
caulking. This is compared to 13.4 percent in 2010 and 8.3 percent in 2009. These results indicate
a continued rise after what seemed to be a period of declining popularity for this practice.
In houses on slabs, 15.9 percent of the single-family detached houses on slabs used caulking as a
sealing method. This is up from the 7.9 percent reported in 2010 and 4.9 percent reported in 2009.
The use of polyethylene membranes under the slab does not correlate as strongly with radon
exposure zones as does the presence of fully operable systems. In the 2011 sample, 59.4
percent of single-family detached homes with basements in Zone 1 were sealed with
polyethylene or another membrane under the basement, as were 48.5 percent in Zone 2, and
56.7 percent in Zone 3.
In 2011, among single-family detached houses with slabs, membranes were used in 71.6
percent of homes Zone 1, 45.9 percent in Zone 2, and 41.1 percent in Zone 3. This compares to
the sample in 2010 where 47.3 percent in Zone 1, 45.9 percent in Zone 2, and 31.4 percent in
Zone 3 used a membrane under slab as a sealing method. These values continue to be an
indicator that these sealing techniques are used primarily for benefits not related to radon-
reduction.
COSTS OF INSTALLING PASSIVE OR ACTIVE SUB SLAB OR SUB-MEMBRANE VENTILATION
The cost of installing radon-reducing systems in single-family detached homes has been noted
as a barrier to their increased usage. In 2011, the average installation cost for a passive system
in a single-family detached home was approximately $296. This cost has remained about the
same over the past several years, comparing to $297 in 2010, $290 in 2009, and $295 in 2008.
The average cost of an active radon-reduction system in new SFD homes in 2011 was $707,
which represents an increase in the cost of fan-driven systems which was $662 in 2010 and
$618 in 2009.
NAHB Research Center, Inc. Page 21
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APPENDICES
-------
APPENDIX A
SINGLE-FAMILY DETACHED
USAGE COEFFICIENT TABLES
BY THE NINE CENSUS DIVISIONS
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2011 DATA
PAGE1
SAMPLE SIZE
Units
Builders
WGHTD AVERAGE UNITS PER BLDR
NEW ENG
186
81
2.3
MID ATL
354
121
2.9
ENCEN
871
199
4.4
W N CEN
753
171
4.7
SATL
1294
261
4.7
ESCEN
581
98
5.9
W S CEN
1332
158
8.8
MTN
236
92
2.7
PAC
487
135
3.9
US TOTAL I
6092
1316
5.2
TYPE OF HOUSE: WITH RADON REDUCING FEATURES
One Story Dwellings With Basements
With radon reducing features
No radon reducing features
One story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
One Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Two Story Dwellings With Basements
With radon reducing features
No radon reducing features
Two Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Three Story Dwellings With Basements
With radon reducing features
No radon reducing features
Three Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATION -- EXCEPT PIERS
Basements
With radon reducing features
No radon reducing features
Crawl Spaces
With radon reducing features
No radon reducing features
Slabs on Grade
With radon reducing features
No radon reducing features
TOTAL
ALL DWELLINGS -- EXCEPT ON PIERS
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
7.8%
29.2%
0.0%
0.4%
2.8%
2.1%
11.3%
42.3%
0.0%
0.1%
0.7%
0.9%
0.0%
1.9%
0.0%
0.0%
0.0%
0.0%
0.5%
100.0%
19.2%
73.7%
0.0%
0.4%
3.6%
3.0%
100.0%
22.8%
77.2%
100.0%
6.1%
29.0%
0.0%
1.3%
0.3%
1.8%
16.9%
37.5%
0.0%
2.1%
0.1%
3.5%
0.0%
0.2%
0.0%
0.7%
0.0%
0.0%
0.6%
100.0%
23.1%
67.2%
0.0%
4.1%
0.4%
5.3%
100.0%
23.5%
76.5%
100.0%
12.1%
35.5%
3.9%
3.7%
0.3%
6.0%
9.3%
24.4%
0.6%
2.8%
0.1%
0.6%
0.1%
0.3%
0.0%
0.0%
0.0%
0.0%
0.3%
100.0%
21.5%
60.3%
4.6%
6.5%
0.5%
6.6%
100.0%
26.5%
73.5%
100.0%
23.8%
40.4%
0.0%
3.0%
0.9%
1.5%
14.4%
13.8%
0.0%
0.3%
0.8%
0.2%
0.4%
0.0%
0.0%
0.0%
0.0%
0.0%
0.5%
100.0%
38.7%
54.6%
0.0%
3.4%
1.7%
1.7%
100.0%
40.4%
59.6%
100.0%
1.0%
8.1%
0.7%
8.5%
2.2%
25.6%
9.5%
11.4%
1.3%
9.5%
0.4%
17.7%
0.7%
1.2%
0.0%
0.2%
0.0%
0.2%
1.6%
100.0%
11.3%
20.8%
2.0%
18.4%
2.7%
44.8%
100.0%
16.1%
83.9%
100.0%
5.5%
5.6%
1.6%
25.0%
4.2%
25.3%
6.0%
3.5%
3.1%
7.8%
3.5%
7.8%
0.2%
0.0%
0.0%
0.0%
0.0%
0.1%
0.8%
100.0%
11.7%
9.1%
4.7%
33.1%
7.8%
33.7%
100.0%
24.2%
75.8%
100.0%
0.0%
2.9%
0.0%
0.9%
1.1%
58.0%
0.1%
0.7%
0.0%
0.7%
0.6%
30.0%
0.0%
0.0%
0.0%
0.0%
0.0%
1.0%
4.0%
100.0%
0.1%
3.7%
0.0%
1.7%
1.7%
92.8%
100.0%
1.8%
98.2%
100.0%
4.9%
12.1%
1.8%
7.3%
5.7%
23.2%
1.5%
14.0%
2.6%
8.7%
0.6%
13.5%
2.1%
0.7%
0.0%
1.0%
0.0%
0.3%
0.0%
100.0%
8.5%
26.7%
4.5%
17.0%
6.3%
37.0%
100.0%
19.3%
80.7%
100.0%
1.5%
4.2%
1.6%
13.3%
1.1%
29.0%
1.4%
7.7%
1.0%
16.3%
0.6%
18.1%
0.0%
2.2%
0.0%
0.1%
0.0%
0.3%
1.7%
100.0%
2.9%
14.2%
2.7%
29.8%
1.7%
48.7%
100.0%
7.2%
92.8%
100.0%
4.8%
13.8%
1.0%
6.9%
2.0%
26.6%
6.6%
12.4%
1.0%
6.2%
0.7%
14.9%
0.4%
0.7%
0.0%
0.2%
0.0%
0.3%
1.6%
100.0%
11.9%
27.0%
2.0%
13.4%
2.7%
43.0%
100.0%
16.6%
83.4%
100.0%
APPENDIX A
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2011 DATA
PAGE 2
TESTING OF DWELLINGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units With Basements
Tested For Radon Levels
Tested Units Needing More Work
Units With Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units With Slabs
Tested For Radon Levels
Tested Units Needing More Work
NEW ENG
40.7%
12.9%
40.8%
13.8%
31.4%
0.0%
39.4%
0.0%
MID ATL
24.9%
16.0%
24.2%
18.3%
72.7%
0.0%
3.4%
5.0%
ENCEN
21.5%
26.2%
22.6%
30.0%
25.1%
0.7%
3.1%
26.8%
W N CEN
25.0%
26.1%
25.5%
27.5%
10.4%
0.5%
27.8%
1.2%
SATL
7.7%
9.3%
11.8%
9.9%
5.4%
8.3%
5.9%
8.8%
ESCEN
3.7%
8.6%
6.8%
10.0%
3.7%
11.5%
2.1%
1.4%
W S CEN
2.6%
0.0%
9.0%
0.0%
0.0%
0.0%
2.4%
0.0%
MTN
17.4%
5.8%
17.6%
6.7%
42.5%
5.5%
4.9%
4.6%
PAC
4.4%
0.0%
7.1%
0.0%
6.8%
0.0%
1.8%
0.0%
US TOTAL
11.5%
15.0%
20.1%
20.0%
12.8%
4.3%
3.8%
4.8%
CONSTRUCTION METHOD
DWELLINGS WITH RADON REDUCING FEATURES
Conventional Constructed On Site
With radon reducing features
No radon reducing features
Prefabricated Units (Panelized)
With radon reducing features
No radon reducing features
Modular
With radon reducing features
No radon reducing features
ALL Dwellings
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
22.8%
77.2%
0.0%
0.0%
0.0%
0.0%
23.5%
76.5%
0.0%
0.0%
0.0%
0.0%
26.5%
73.5%
0.0%
0.0%
0.0%
0.0%
40.4%
59.6%
0.0%
0.0%
0.0%
0.0%
16.1%
83.9%
0.0%
0.0%
0.0%
0.0%
24.2%
75.8%
0.0%
0.0%
0.0%
0.0%
1.8%
98.2%
0.0%
0.0%
0.0%
0.0%
19.3%
80.7%
0.0%
0.0%
0.0%
0.0%
7.2%
92.8%
0.0%
0.0%
0.0%
0.0%
16.6%
83.4%
0.0%
0.0%
0.0%
0.0%
22.8%
77.2%
100.0%
23.5%
76.5%
100.0%
26.5%
73.5%
100.0%
40.4%
59.6%
100.0%
16.1%
83.9%
100.0%
24.2%
75.8%
100.0%
1.8%
98.2%
100.0%
19.3%
80.7%
100.0%
7.2%
92.8%
100.0%
16.6%
83.4%
100.0%
SIZE OF BUILDER
DWELLINGS WITH RADON REDUCING FEATURES
One to Ten Dwellings Per Year
With radon reducing features 22.8% 23.1% 13.2% 22.5% 9.0% 6.5% 0.6% 12.3% 3.0% 9.4%
No radon reducing features 56.1% 53.2% 43.9% 38.4% 40.8% 31.3% 28.3% 57.7% 54.7% 41.9%
Eleven To Twenty-Five Dwellings Per Year
With radon reducing features 0.0% 0.0% 10.4% 6.2% 1.4% 3.3% 0.0% 0.0% 0.0% 2.1%
No radon reducing features 8.8% 16.7% 6.8% 9.6% 15.5% 13.2% 11.7% 5.8% 4.4% 11.1%
Twenty-Six To 100 Dwellings Per Year
With radon reducing features 0.0% 0.4% 2.3% 8.3% 3.2% 14.4% 1.2% 7.0% 0.0% 3.6%
No radon reducing features 12.2% 3.0% 17.1% 11.6% 14.1% 25.5% 23.7% 10.7% 29.6% 17.5%
Over 100 Dwellings Per Year
With radon reducing features 0.0% 0.0% 0.6% 3.4% 2.5% 0.0% 0.0% 0.0% 4.3% 1.4%
No radon reducing features 0.0% 3.7% 5.7% 0.0% 13.5% 5.9% 34.5% 6.5% 4.0% 12.9%
APPENDIX A
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2011 DATA
PAGES
METHODS EMPLOYED TO REDUCE RADON
Dwellings With Basements
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - BASEMENTS
Dwellings With Crawl Spaces
Passive stack subslab ventilation
Fan-driven (active) ventilation
Foundation Wall Vents
None
SUBTOTAL - CRAWL SPACES
Dwellings With Slabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALING METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings With Basements
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
SEALING METHODS - SLABS
(Multiple Answers Possible)
Dwellings With Slabs
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
NEW ENG
39.7%
13.2%
6.0%
5.3%
28.7%
93.0%
0.0%
0.0%
0.0%
0.4%
0.4%
0.0%
2.3%
1.3%
0.0%
3.0%
6.6%
100.0%
25.8%
9.4%
13.2%
6.7%
1.0%
7.8%
3.5%
58.8%
126.4%
35.3%
9.0%
19.6%
9.0%
0.0%
0.0%
0.0%
64.7%
137.6%
MID ATL
24.2%
19.7%
3.4%
20.0%
23.0%
90.3%
0.0%
0.0%
0.7%
3.4%
4.1%
0.0%
0.4%
0.0%
1.7%
3.6%
5.7%
100.0%
58.9%
8.4%
18.7%
3.8%
2.2%
20.2%
0.0%
36.5%
148.8%
56.6%
23.5%
23.5%
0.0%
0.0%
0.0%
0.0%
43.4%
147.0%
ENCEN
16.3%
17.1%
4.3%
20.4%
23.6%
81.8%
4.6%
0.0%
1.7%
4.9%
11.1%
0.5%
0.4%
0.0%
3.4%
2.8%
7.1%
100.0%
51.9%
12.6%
25.3%
11.5%
1.1%
27.4%
0.0%
36.5%
166.4%
58.9%
23.2%
6.8%
0.8%
0.0%
32.0%
0.0%
32.8%
154.5%
W N CEN
20.3%
35.0%
3.7%
15.1%
19.2%
93.3%
0.0%
0.0%
0.0%
3.4%
3.4%
0.4%
1.7%
0.0%
1.0%
0.3%
3.3%
100.0%
57.5%
18.1%
20.4%
11.4%
0.6%
25.8%
0.2%
31.2%
165.2%
42.4%
8.4%
22.1%
4.6%
3.5%
19.5%
0.0%
7.5%
108.0%
SATL
6.2%
10.0%
1.3%
8.5%
6.1%
32.1%
2.0%
0.0%
2.2%
16.1%
20.4%
0.5%
2.5%
0.3%
27.1%
17.2%
47.5%
100.0%
50.9%
3.3%
14.3%
12.5%
1.4%
10.2%
0.0%
40.3%
132.9%
56.1%
6.3%
6.3%
3.1%
0.3%
0.0%
0.0%
36.9%
109.0%
ESCEN
1.5%
10.4%
1.3%
5.7%
2.0%
20.9%
4.6%
0.1%
10.3%
22.7%
37.7%
0.4%
7.8%
0.0%
23.5%
9.8%
41.4%
100.0%
85.6%
13.2%
37.6%
3.0%
0.0%
32.8%
0.0%
14.4%
186.5%
69.1%
2.1%
18.9%
2.1%
0.0%
8.3%
0.0%
23.5%
124.0%
W S CEN
0.0%
0.1%
0.0%
3.3%
0.3%
3.8%
0.0%
0.0%
0.2%
1.5%
1.7%
0.1%
1.7%
0.0%
43.8%
48.9%
94.5%
100.0%
79.5%
8.0%
7.4%
0.7%
0.7%
0.7%
0.0%
9.3%
106.3%
39.0%
2.0%
11.5%
8.5%
0.0%
0.0%
0.0%
51.9%
112.9%
MTN
2.4%
5.4%
3.2%
4.3%
20.1%
35.3%
1.6%
2.9%
1.7%
15.3%
21.4%
0.4%
6.3%
0.1%
7.3%
29.3%
43.3%
100.0%
27.1%
5.5%
13.2%
8.1%
0.0%
4.8%
0.0%
63.5%
122.1%
5.6%
12.1%
37.4%
2.6%
1.7%
3.9%
0.0%
48.3%
111.8%
PAC
1.0%
0.5%
2.3%
8.6%
4.6%
17.1%
1.6%
1.1%
8.6%
21.2%
32.5%
1.0%
0.5%
1.2%
18.1%
29.6%
50.4%
100.0%
48.0%
12.9%
17.1%
9.4%
0.0%
0.0%
0.0%
45.8%
133.2%
30.2%
5.6%
26.2%
1.1%
0.0%
0.0%
0.0%
48.5%
111.5%
US TOTAL
7.7%
9.8%
2.1%
9.1%
10.1%
38.9%
1.6%
0.4%
2.6%
10.8%
15.4%
0.4%
2.4%
0.2%
20.9%
21.8%
45.7%
100.0%
57.0%
8.7%
16.5%
7.8%
0.8%
11.6%
0.1%
34.1%
136.7%
44.7%
8.5%
15.9%
3.7%
0.5%
5.6%
0.0%
39.9%
118.8%
APPENDIX A
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2011 DATA
PAGE 4
SUBSLAB PREPARATION -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
77.4%
2.5%
17.7%
8.8%
30.7%
32.5%
41.2%
0.7%
22.5%
233.9%
85.1%
6.2%
2.5%
0.6%
32.9%
51.3%
73.4%
4.1%
8.4%
264.5%
77.0%
7.9%
17.4%
4.0%
32.6%
39.2%
64.5%
1.7%
11.4%
255.8%
85.4%
3.7%
18.3%
2.1%
23.2%
54.9%
75.4%
7.2%
10.0%
280.1%
47.7%
5.4%
37.3%
1.5%
24.2%
22.9%
80.2%
6.9%
5.7%
231.8%
65.0%
10.4%
18.6%
0.6%
18.6%
41.8%
76.4%
16.6%
2.9%
250.9%
20.2%
6.0%
68.7%
0.6%
3.6%
2.0%
62.6%
3.5%
9.8%
177.0%
87.3%
4.3%
16.5%
8.3%
32.4%
13.2%
30.2%
7.8%
8.6%
208.6%
52.8%
9.6%
62.6%
2.2%
36.7%
17.3%
62.2%
3.9%
7.8%
255.2%
56.3%
6.3%
37.1%
2.4%
23.1%
24.4%
66.3%
5.8%
8.4%
230.1%
SUBSLAB PREPARATION -- BASEMENTS
(Multiple Answers Possible)
Dwellings On Basements
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
75.3%
2.5%
16.1%
6.2%
28.6%
30.6%
40.0%
0.8%
22.9%
223.1%
86.4%
5.7%
2.6%
0.6%
32.2%
53.3%
74.1%
4.6%
7.6%
267.2%
76.4%
8.1%
15.3%
4.4%
28.5%
38.8%
62.9%
2.0%
12.4%
248.9%
85.3%
3.8%
18.7%
2.0%
22.7%
54.6%
75.1%
7.1%
10.2%
279.6%
63.6%
8.4%
13.6%
2.1%
22.9%
20.8%
77.9%
8.8%
30.0%
248.1%
93.4%
0.0%
5.4%
3.0%
12.2%
46.8%
77.8%
27.9%
15.0%
281.5%
13.6%
4.9%
82.7%
9.2%
5.7%
26.1%
33.7%
0.0%
54.1%
229.8%
78.3%
2.6%
3.4%
4.8%
44.8%
26.4%
42.6%
6.9%
32.2%
242.1%
71.7%
4.5%
46.6%
11.6%
47.2%
36.4%
62.1%
20.1%
25.6%
325.9%
62.2%
5.4%
29.6%
5.1%
24.5%
32.4%
60.9%
8.1%
28.9%
257.2%
SUBSLAB PREPARATION -- SLABS
(Multiple Answers Possible)
Dwellings On Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
100.0%
0.0%
21.1%
42.9%
53.4%
57.1%
35.3%
0.0%
32.3%
342.1%
70.6%
19.9%
0.0%
0.0%
52.6%
26.8%
79.8%
0.0%
9.5%
259.2%
64.6%
11.4%
33.8%
0.0%
68.4%
63.3%
72.8%
0.0%
32.3%
346.5%
64.9%
0.0%
9.9%
2.0%
26.7%
37.3%
54.5%
7.9%
2.7%
205.8%
35.4%
0.6%
53.4%
0.5%
29.8%
14.3%
87.0%
3.4%
3.9%
228.3%
53.9%
11.5%
22.7%
0.0%
25.9%
29.1%
72.6%
5.7%
0.9%
222.5%
20.5%
6.2%
67.7%
0.4%
3.5%
1.3%
63.9%
3.7%
8.8%
175.8%
94.8%
2.6%
40.1%
5.2%
50.4%
3.9%
36.9%
8.7%
7.8%
250.3%
53.7%
12.0%
73.4%
0.0%
39.0%
10.6%
61.4%
5.2%
1.7%
256.9%
50.1%
6.1%
45.7%
2.0%
32.6%
19.7%
68.1%
4.0%
8.6%
237.0%
APPENDIX A
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2011 DATA
PAGES
COST OF PASSIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
NEW ENG
39
15.3%
22.9%
9.5%
16.7%
29.3%
0.0%
6.2%
100.0%
MID ATL
47
20.6%
38.3%
23.0%
10.2%
3.3%
0.9%
3.8%
100.0%
ENCEN
80
33.1%
32.1%
16.1%
12.0%
1.2%
1.3%
4.2%
100.0%
W N CEN
92
26.3%
34.6%
12.3%
7.3%
12.6%
1.6%
5.3%
100.0%
SATL
70
37.9%
27.3%
15.4%
4.0%
12.5%
1.1%
1.7%
100.0%
ESCEN
26
74.8%
7.8%
17.4%
0.0%
0.0%
0.0%
0.0%
100.0%
W S CEN
19
43.8%
14.2%
27.2%
0.0%
14.8%
0.0%
0.0%
100.0%
MTN
25
25.2%
8.6%
32.5%
1.8%
0.0%
3.7%
28.2%
100.0%
PAC
25
51.4%
4.9%
30.8%
8.3%
3.2%
1.5%
0.0%
100.0%
US TOTAL
423
36.2%
25.6%
17.8%
6.1%
7.8%
1.3%
5.3%
100.0%
COST OF ACTIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
12
0.0%
4.1%
42.6%
0.0%
27.0%
4.1%
22.3%
100.0%
22
24.3%
44.5%
12.9%
2.7%
0.0%
13.5%
2.1%
100.0%
35
18.2%
7.9%
9.7%
19.2%
27.5%
15.5%
1.9%
100.0%
40
21.8%
18.1%
9.6%
7.2%
4.6%
23.8%
15.0%
100.0%
29
43.4%
7.7%
15.2%
10.2%
0.0%
0.2%
23.5%
100.0%
10
20.6%
58.8%
7.4%
0.0%
7.4%
5.9%
0.0%
100.0%
5
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
14
5.1%
0.0%
6.3%
12.9%
0.0%
42.4%
33.3%
100.0%
10
10.3%
69.0%
0.0%
10.3%
0.0%
10.3%
0.0%
100.0%
177
17.6%
21.6%
10.9%
10.2%
7.2%
17.6%
14.8%
100.0%
APPENDIX A
-------
APPENDIX B
MULTI FAMILY
USAGE COEFFICIENT TABLES
BY THE NINE CENSUS DIVISIONS
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
MULTIFAMILY DWELLINGS -2011 DATA
PAGE1
SAMPLE SIZE
Units
Builders
WGHTD AVERAGE UNITS PER BLDR
NEW ENG
188
18
10.5
MID ATL
126
10
12.6
ENCEN
290
26
11.2
W N CEN
173
18
9.6
SATL
811
28
28.9
ESCEN
153
12
12.8
W S CEN
242
16
15.1
MTN
62
9
6.9
PAC
686
23
29.8
US TOTAL I
2731
160
18.6
TYPE OF HOUSE: WITH RADON REDUCING FEATURES
One Story Dwellings With Basements
With radon reducing features
No radon reducing features
One story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
One Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Two Story Dwellings With Basements
With radon reducing features
No radon reducing features
Two Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Three Story Dwellings With Basements
With radon reducing features
No radon reducing features
Three Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATION -- EXCEPT PIERS
Basements
With radon reducing features
No radon reducing features
Crawl Spaces
With radon reducing features
No radon reducing features
Slabs on Grade
With radon reducing features
No radon reducing features
TOTAL
ALL DWELLINGS -- EXCEPT ON PIERS
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
4.2%
33.1%
0.0%
0.1%
0.0%
5.6%
17.8%
27.7%
0.0%
0.4%
0.0%
3.4%
1.4%
3.7%
0.0%
0.6%
0.0%
1.9%
0.1%
100.0%
23.5%
64.5%
0.0%
1.1%
0.0%
11.0%
100.0%
23.5%
76.5%
100.0%
20.8%
2.4%
0.0%
0.0%
2.8%
14.8%
20.3%
19.9%
0.0%
0.0%
3.9%
6.5%
8.6%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
49.8%
22.2%
0.0%
0.0%
6.7%
21.3%
100.0%
56.5%
43.5%
100.0%
3.2%
20.8%
0.0%
2.6%
2.3%
31.3%
0.7%
8.1%
0.0%
1.6%
0.3%
18.7%
0.2%
2.7%
0.0%
0.1%
0.0%
7.1%
0.4%
100.0%
4.1%
31.7%
0.0%
4.3%
2.5%
57.4%
100.0%
6.6%
93.4%
100.0%
11.3%
29.9%
0.0%
6.0%
4.6%
19.5%
0.6%
13.6%
0.0%
0.0%
4.6%
5.8%
0.0%
0.2%
0.0%
0.0%
1.2%
2.6%
0.0%
100.0%
11.9%
43.7%
0.0%
6.0%
10.5%
27.9%
100.0%
22.4%
77.6%
100.0%
0.4%
4.2%
0.0%
3.8%
3.6%
15.5%
3.9%
4.2%
0.0%
5.8%
3.6%
7.2%
0.2%
4.2%
0.0%
4.4%
14.4%
13.3%
11.4%
100.0%
5.0%
14.2%
0.0%
15.8%
24.4%
40.6%
100.0%
29.4%
70.6%
100.0%
0.0%
1.1%
0.0%
15.5%
0.0%
28.2%
0.0%
1.2%
0.0%
10.3%
11.7%
17.9%
0.0%
5.9%
0.0%
0.1%
0.0%
8.0%
0.2%
100.0%
0.0%
8.1%
0.0%
26.0%
11.8%
54.1%
100.0%
11.8%
88.2%
100.0%
0.0%
2.9%
0.0%
0.3%
1.2%
41.0%
0.0%
3.2%
0.0%
0.3%
1.2%
15.1%
0.0%
3.5%
0.0%
0.4%
0.0%
22.7%
8.0%
100.0%
0.0%
10.4%
0.0%
1.2%
2.7%
85.7%
100.0%
2.7%
97.3%
100.0%
0.5%
4.5%
0.0%
0.2%
5.7%
10.9%
0.6%
20.7%
0.0%
0.2%
6.3%
35.8%
0.6%
1.6%
0.0%
0.2%
6.9%
5.0%
0.3%
100.0%
1.7%
26.9%
0.0%
0.7%
19.0%
51.7%
100.0%
20.7%
79.3%
100.0%
0.0%
4.3%
0.0%
2.0%
0.0%
29.3%
1.2%
4.5%
0.4%
2.5%
2.1%
23.2%
0.0%
4.7%
0.0%
2.6%
0.0%
12.7%
10.6%
100.0%
1.3%
15.1%
0.5%
7.9%
2.3%
72.9%
100.0%
4.1%
95.9%
100.0%
3.8%
7.8%
0.0%
2.6%
2.3%
24.0%
4.2%
8.8%
0.1%
2.4%
3.2%
14.7%
1.2%
3.1%
0.0%
1.5%
3.7%
10.8%
5.7%
100.0%
9.4%
20.5%
0.1%
7.1%
9.9%
53.0%
100.0%
19.4%
80.6%
100.0%
APPENDIX B
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
MULTIFAMILY DWELLINGS -2011 DATA
PAGE 2
TESTING OF DWELLINGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units With Basements
Tested For Radon Levels
Tested Units Needing More Work
Units With Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units With Slabs
Tested For Radon Levels
Tested Units Needing More Work
NEW ENG
29.8%
13.1%
23.9%
18.0%
100.0%
10.0%
69.8%
0.0%
MID ATL
44.1%
24.7%
57.9%
23.7%
0.0%
0.0%
8.9%
42.8%
ENCEN
16.4%
29.7%
16.6%
25.5%
31.6%
16.3%
15.2%
34.5%
W N CEN
19.9%
13.5%
13.3%
29.2%
0.0%
0.0%
32.6%
4.2%
SATL
3.3%
5.9%
6.1%
16.8%
0.8%
0.0%
3.1%
0.0%
ESCEN
1.2%
0.0%
0.0%
0.0%
0.0%
0.0%
1.8%
0.0%
W S CEN
2.9%
0.0%
0.0%
0.0%
0.0%
0.0%
3.3%
0.0%
MTN
0.4%
82.4%
0.1%
1.0%
0.3%
1.0%
0.5%
86.9%
PAC
0.4%
0.0%
0.4%
0.0%
2.1%
0.0%
0.2%
0.0%
US TOTAL
10.6%
20.4%
24.2%
23.4%
3.1%
11.3%
5.5%
14.5%
CONSTRUCTION METHOD
DWELLINGS WITH RADON REDUCING FEATURES
Conventional Constructed On Site
With radon reducing features
No radon reducing features
Prefabricated Units (Panelized)
With radon reducing features
No radon reducing features
Modular
With radon reducing features
No radon reducing features
ALL Dwellings
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
23.5%
76.5%
0.0%
0.0%
0.0%
0.0%
56.5%
43.5%
0.0%
0.0%
0.0%
0.0%
6.6%
93.4%
0.0%
0.0%
0.0%
0.0%
22.4%
77.6%
0.0%
0.0%
0.0%
0.0%
29.4%
70.6%
0.0%
0.0%
0.0%
0.0%
11.8%
88.2%
0.0%
0.0%
0.0%
0.0%
2.7%
97.3%
0.0%
0.0%
0.0%
0.0%
20.7%
79.3%
0.0%
0.0%
0.0%
0.0%
4.1%
95.9%
0.0%
0.0%
0.0%
0.0%
19.4%
80.6%
0.0%
0.0%
0.0%
0.0%
23.5%
76.5%
100.0%
56.5%
43.5%
100.0%
6.6%
93.4%
100.0%
22.4%
77.6%
100.0%
29.4%
70.6%
100.0%
11.8%
88.2%
100.0%
2.7%
97.3%
100.0%
20.7%
79.3%
100.0%
4.1%
95.9%
100.0%
19.4%
80.6%
100.0%
SIZE OF BUILDER
DWELLINGS WITH RADON REDUCING FEATURES
One to Ten Dwellings Per Year
With radon reducing features 9.0% 9.7% 3.1% 11.9% 3.7% 0.0% 2.7% 20.7% 0.0% 5.4%
No radon reducing features 17.0% 5.5% 15.0% 6.6% 4.6% 14.4% 16.0% 59.6% 4.9% 12.9%
Eleven To Twenty-Five Dwellings Per Year
With radon reducing features 14.4% 18.6% 1.5% 10.5% 2.8% 11.8% 0.0% 0.0% 0.0% 4.8%
No radon reducing features 29.2% 17.8% 30.9% 40.0% 10.6% 38.9% 4.3% 19.8% 9.2% 16.6%
Twenty-Six To 100 Dwellings Per Year
With radon reducing features 0.0% 28.1% 2.0% 0.0% 0.0% 0.0% 0.0% 0.0% 4.1% 4.3%
No radon reducing features 30.4% 20.2% 47.5% 31.0% 14.3% 35.0% 77.0% 0.0% 48.7% 36.8%
Over 100 Dwellings Per Year
With radon reducing features 0.0% 0.0% 0.0% 0.0% 22.9% 0.0% 0.0% 0.0% 0.0% 4.9%
No radon reducing features 0.0% 0.0% 0.0% 0.0% 41.1% 0.0% 0.0% 0.0% 33.1% 14.2%
APPENDIX B
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
MULTIFAMILY DWELLINGS -2011 DATA
PAGES
METHODS EMPLOYED TO REDUCE RADON
Dwellings With Basements
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - BASEMENTS
Dwellings With Crawl Spaces
Passive stack subslab ventilation
Fan-driven (active) ventilation
Foundation Wall Vents
None
SUBTOTAL - CRAWL SPACES
Dwellings With Slabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALING METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings With Basements
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
SEALING METHODS - SLABS
(Multiple Answers Possible)
Dwellings With Slabs
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
NEW ENG
20.7%
19.2%
4.3%
7.4%
36.4%
88.0%
0.0%
0.0%
0.0%
1.1%
1.1%
7.3%
0.0%
0.0%
2.1%
1.6%
11.0%
100.0%
42.2%
6.0%
15.7%
0.0%
0.0%
0.0%
0.0%
51.7%
115.7%
19.3%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
80.7%
100.0%
MID ATL
7.2%
31.1%
18.6%
2.4%
12.7%
72.0%
0.0%
0.0%
0.0%
0.0%
0.0%
13.0%
6.7%
0.0%
8.3%
0.0%
28.0%
100.0%
49.9%
42.6%
36.0%
0.0%
0.0%
53.7%
0.0%
43.5%
225.6%
70.5%
29.6%
29.6%
0.0%
0.0%
51.7%
0.0%
0.0%
181.3%
ENCEN
18.2%
2.5%
1.6%
5.9%
7.6%
35.8%
0.0%
0.0%
0.0%
4.3%
4.3%
24.6%
0.7%
1.9%
14.6%
18.2%
59.9%
100.0%
61.9%
5.8%
34.6%
24.6%
0.0%
29.7%
0.0%
24.8%
181.3%
59.1%
1.6%
32.8%
11.2%
0.0%
25.2%
0.0%
30.4%
160.3%
W N CEN
24.5%
10.7%
1.2%
5.5%
13.8%
55.6%
0.0%
0.0%
6.0%
0.0%
6.0%
6.6%
10.5%
0.0%
19.1%
2.3%
38.4%
100.0%
65.9%
47.1%
5.2%
3.1%
0.0%
6.3%
0.0%
30.0%
157.5%
94.1%
46.4%
47.0%
0.0%
0.0%
47.0%
0.0%
5.9%
240.4%
SATL
0.2%
4.5%
0.5%
0.4%
13.6%
19.2%
0.0%
0.0%
13.5%
2.3%
15.8%
14.7%
23.9%
0.5%
13.7%
12.3%
65.0%
100.0%
24.4%
0.0%
21.2%
6.4%
0.0%
23.4%
0.0%
70.9%
146.2%
36.5%
0.0%
21.9%
0.7%
0.0%
42.2%
0.0%
19.6%
120.9%
ESCEN
0.0%
0.0%
0.0%
0.0%
8.1%
8.1%
0.0%
0.0%
0.0%
26.0%
26.0%
0.0%
11.8%
0.0%
17.5%
36.6%
65.9%
100.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
100.0%
26.6%
0.0%
20.6%
0.0%
0.0%
20.6%
0.0%
73.4%
141.3%
W S CEN
0.0%
0.0%
0.0%
5.6%
4.8%
10.4%
0.0%
0.0%
0.0%
1.2%
1.2%
0.0%
2.7%
0.0%
52.9%
32.9%
88.4%
100.0%
0.0%
54.1%
0.0%
0.0%
0.0%
0.0%
0.0%
46.0%
100.0%
45.9%
17.0%
22.0%
19.2%
0.0%
0.0%
0.0%
37.2%
141.2%
MTN
0.0%
1.6%
0.0%
0.0%
26.9%
28.6%
0.0%
0.0%
0.0%
0.7%
0.7%
0.0%
4.4%
14.6%
0.0%
51.8%
70.8%
100.0%
0.0%
5.8%
0.0%
0.0%
0.0%
0.0%
0.0%
94.2%
100.0%
0.0%
6.2%
0.0%
20.7%
0.0%
0.0%
0.0%
73.1%
100.0%
PAC
0.0%
0.0%
1.3%
0.0%
15.1%
16.4%
0.4%
0.1%
2.0%
5.9%
8.4%
0.0%
0.0%
2.3%
26.6%
46.3%
75.2%
100.0%
0.0%
0.0%
8.1%
0.0%
0.0%
0.0%
0.0%
91.9%
100.0%
35.4%
2.0%
3.0%
0.0%
0.0%
0.0%
0.0%
61.6%
102.0%
US TOTAL
4.9%
6.5%
2.9%
2.6%
13.1%
29.9%
0.1%
0.0%
3.6%
3.4%
7.2%
7.6%
8.1%
1.7%
21.6%
23.8%
62.9%
100.0%
22.7%
19.6%
14.2%
3.7%
0.0%
14.6%
0.0%
62.1%
136.8%
44.4%
10.9%
20.0%
6.2%
0.0%
21.8%
0.0%
36.1%
139.4%
APPENDIX B
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
MULTIFAMILY DWELLINGS -2011 DATA
PAGE 4
SUBSLAB PREPARATION -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
SUBSLAB PREPARATION -- BASEMENTS
(Multiple Answers Possible)
Dwellings On Basements
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
SUBSLAB PREPARATION -- SLABS
(Multiple Answers Possible)
Dwellings On Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
NEW ENG
63.0%
5.4%
2.2%
16.7%
33.6%
26.9%
35.6%
4.3%
50.0%
237.7%
60.8%
3.6%
0.6%
18.8%
33.6%
28.5%
35.8%
4.8%
54.4%
241.0%
80.7%
19.3%
14.5%
0.0%
33.8%
14.5%
33.8%
0.0%
14.5%
211.2%
MID ATL
79.1%
8.3%
9.6%
0.0%
69.0%
75.9%
81.8%
9.6%
13.5%
346.6%
70.9%
11.5%
13.3%
0.0%
61.4%
82.4%
74.7%
13.3%
18.7%
346.1%
100.0%
0.0%
0.0%
0.0%
88.6%
59.1%
100.0%
0.0%
0.0%
347.7%
ENCEN
82.7%
16.0%
6.5%
0.0%
48.2%
26.8%
58.8%
0.0%
19.3%
258.3%
89.0%
7.6%
17.4%
0.0%
52.1%
49.1%
57.4%
0.0%
0.0%
272.5%
79.0%
21.0%
0.0%
0.0%
45.9%
13.5%
59.6%
0.0%
30.8%
249.8%
W N CEN
100.0%
0.0%
16.3%
0.0%
23.5%
98.2%
84.2%
1.2%
7.0%
330.3%
100.0%
0.0%
7.3%
0.0%
3.1%
96.9%
77.3%
2.1%
0.0%
286.7%
100.0%
0.0%
29.4%
0.0%
52.8%
100.0%
94.1%
0.0%
17.1%
393.4%
SATL
76.3%
0.0%
24.9%
0.0%
62.7%
22.0%
43.9%
0.3%
1.0%
231.1%
98.0%
0.0%
4.3%
0.0%
24.6%
21.2%
24.4%
0.0%
2.0%
174.5%
69.9%
0.0%
31.0%
0.0%
73.9%
22.2%
49.7%
0.4%
0.7%
247.8%
ESCEN
76.0%
0.0%
7.1%
0.0%
55.9%
21.9%
85.9%
12.4%
12.8%
271.9%
100.0%
0.0%
0.0%
0.0%
100.0%
0.0%
100.0%
0.0%
0.0%
300.0%
73.0%
0.0%
7.9%
0.0%
50.4%
24.6%
84.1%
13.9%
14.4%
268.4%
W S CEN
7.7%
0.0%
48.2%
0.0%
0.0%
2.7%
39.6%
42.2%
11.3%
151.7%
0.0%
0.0%
54.1%
0.0%
0.0%
0.0%
0.0%
43.2%
100.0%
197.3%
8.6%
0.0%
47.5%
0.0%
0.0%
3.0%
44.2%
42.1%
0.9%
146.3%
MTN
73.2%
26.8%
0.0%
0.0%
35.2%
0.0%
16.2%
19.4%
12.1%
182.9%
84.6%
15.4%
0.0%
0.0%
5.8%
0.0%
56.4%
15.4%
26.6%
204.1%
68.6%
31.4%
0.0%
0.0%
47.1%
0.0%
0.0%
21.1%
6.2%
174.4%
PAC
69.5%
11.1%
59.8%
1.7%
24.4%
0.0%
63.2%
0.0%
18.8%
248.5%
85.6%
0.0%
29.0%
0.0%
8.1%
0.0%
29.0%
0.0%
68.8%
220.6%
66.0%
13.5%
66.5%
2.0%
28.0%
0.0%
70.7%
0.0%
7.9%
254.6%
US TOTAL
64.4%
6.4%
27.3%
0.8%
38.2%
25.6%
54.8%
11.3%
12.4%
241.3%
71.8%
3.3%
19.3%
0.6%
25.4%
26.6%
39.9%
11.0%
36.2%
234.3%
64.9%
7.1%
29.2%
0.3%
46.1%
22.4%
59.7%
10.1%
7.2%
247.0%
APPENDIX B
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
MULTIFAMILY DWELLINGS -2011 DATA
PAGES
COST OF PASSIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
NEW ENG
9
20.0%
23.2%
12.6%
0.0%
33.7%
0.0%
10.5%
100.0%
MID ATL
6
4.5%
68.3%
6.8%
0.0%
14.6%
0.0%
5.9%
100.0%
ENCEN
12
35.5%
19.2%
10.8%
34.5%
0.0%
0.0%
0.0%
100.0%
W N CEN
11
55.7%
26.7%
11.5%
0.0%
2.7%
0.0%
3.5%
100.0%
SATL
12
17.2%
54.2%
0.0%
1.7%
26.9%
0.0%
0.0%
100.0%
ESCEN
0
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
W S CEN
2
0.0%
0.0%
0.0%
0.0%
100.0%
0.0%
0.0%
100.0%
MTN
1
0.0%
0.0%
100.0%
0.0%
0.0%
0.0%
0.0%
100.0%
PAC
0
0.0%
26.9%
0.0%
0.0%
0.0%
0.0%
0.0%
26.9%
US TOTAL
53
15.7%
48.0%
7.1%
1.4%
20.8%
0.0%
2.6%
95.6%
COST OF ACTIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
6
0.0%
0.0%
49.1%
0.0%
0.0%
38.2%
12.7%
100.0%
0
53.2%
0.0%
0.0%
8.5%
0.0%
21.3%
0.0%
83.0%
8
40.6%
0.0%
22.2%
35.0%
2.2%
0.0%
0.0%
100.0%
0
0.0%
55.6%
0.0%
0.0%
0.0%
0.0%
44.4%
100.0%
3
90.4%
0.0%
6.4%
0.0%
3.3%
0.0%
0.0%
100.0%
0
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
1
0.0%
100.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
18
32.2%
13.8%
3.2%
6.4%
0.3%
11.4%
1.1%
68.4%
APPENDIX B
-------
APPENDIX C
SINGLE-FAMILY DETACHED
USAGE COEFFICIENT TABLES
BY THE 32 STATE-MARKET-AREAS
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE1
SAMPLE SIZE
Units
Builders
WGHTD AVERAGE UNITS PER BLDR
TYPE OF HOUSE: WITH RADON REDUCING FEATURES
One Story Dwellings With Basements
With radon reducing features
No radon reducing features
One story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
One Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Two Story Dwellings With Basements
With radon reducing features
No radon reducing features
Two Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Three Story Dwellings With Basements
With radon reducing features
No radon reducing features
Three Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATION -- EXCEPT PIERS
Basements
With radon reducing features
No radon reducing features
Crawl Spaces
With radon reducing features
No radon reducing features
Slabs on Grade
With radon reducing features
No radon reducing features
TOTAL
ALL DWELLINGS -- EXCEPT ON PIERS
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
CT & RI & MA
130
51
2.5
10.6%
24.4%
0.0%
0.6%
0.3%
2.3%
14.4%
42.9%
0.0%
0.1%
0.1%
0.4%
0.0%
3.1%
0.0%
0.0%
0.0%
0.0%
0.8%
100.0%
25.2%
70.9%
0.0%
0.7%
0.5%
2.7%
100.0%
25.7%
74.3%
100.0%
ME&NH&VT
56
30
1.9
3.0%
37.4%
0.0%
0.0%
7.1%
1.8%
5.9%
41.1%
0.0%
0.0%
1.8%
1.8%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
8.9%
78.6%
0.0%
0.0%
8.9%
3.6%
100.0%
17.9%
82.1%
100.0%
NEW ENG
186
81
2.3
7.8%
29.2%
0.0%
0.4%
2.8%
2.1%
11.3%
42.3%
0.0%
0.1%
0.7%
0.9%
0.0%
1.9%
0.0%
0.0%
0.0%
0.0%
0.5%
100.0%
19.2%
73.7%
0.0%
0.4%
3.6%
3.0%
100.0%
22.8%
77.2%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 2
CT & RI & MA
ME&NH&VT
TESTING OF DWELLINGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units With Basements
Tested For Radon Levels
Tested Units Needing More Work
Units With Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units With Slabs
Tested For Radon Levels
Tested Units Needing More Work
52.8%
12.8%
53.6%
13.1%
31.4%
0.0%
31.4%
0.0%
20.1%
13.3%
16.8%
18.2%
0.0%
0.0%
42.9%
0.0%
40.7%
12.9%
40.8%
13.8%
31.4%
0.0%
39.4%
0.0%
CONSTRUCTION METHOD
DWELLINGS WITH RADON REDUCING FEATURES
Conventional Constructed On Site
With radon reducing features
No radon reducing features
Prefabricated Units (Panelized)
With radon reducing features
No radon reducing features
Modular
With radon reducing features
No radon reducing features
ALL Dwellings
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
25.7%
74.3%
0.0%
0.0%
0.0%
0.0%
25.7%
74.3%
100.0%
17.9%
82.1%
0.0%
0.0%
0.0%
0.0%
17.9%
82.1%
100.0%
22.8%
77.2%
0.0%
0.0%
0.0%
0.0%
22.8%
77.2%
100.0%
SIZE OF BUILDER
DWELLINGS WITH RADON REDUCING FEATURES
One to Ten Dwellings Per Year
With radon reducing features
No radon reducing features
Eleven To Twenty-Five Dwellings Per Year
With radon reducing features
No radon reducing features
Twenty-Six To 100 Dwellings Per Year
With radon reducing features
No radon reducing features
Over 100 Dwellings Per Year
With radon reducing features
No radon reducing features
25.7%
56.6%
0.0%
7.7%
0.0%
10.0%
0.0%
0.0%
17.9%
55.4%
0.0%
10.7%
0.0%
16.1%
0.0%
0.0%
22.8%
56.1%
0.0%
0.0%
12.2%
0.0%
0.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGES
METHODS EMPLOYED TO REDUCE RADON
Dwellings With Basements
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - BASEMENTS
Dwellings With Crawl Spaces
Passive stack subslab ventilation
Fan-driven (active) ventilation
Foundation Wall Vents
None
SUBTOTAL - CRAWL SPACES
Dwellings With Slabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALING METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings With Basements
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
SEALING METHODS - SLABS
(Multiple Answers Possible)
Dwellings With Slabs
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
CT & RI & MA
43.1%
16.8%
8.5%
7.3%
20.5%
96.2%
0.0%
0.0%
0.0%
0.7%
0.7%
0.0%
0.5%
0.0%
0.0%
2.7%
3.2%
100.0%
26.6%
4.2%
13.8%
10.6%
1.6%
8.8%
5.6%
59.8%
131.1%
14.3%
14.3%
14.3%
14.3%
0.0%
0.0%
0.0%
85.7%
142.9%
ME&NH&VT
33.9%
7.1%
1.8%
1.8%
42.9%
87.5%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
5.4%
3.6%
0.0%
3.6%
12.5%
100.0%
24.5%
18.4%
12.2%
0.0%
0.0%
6.1%
0.0%
57.1%
118.4%
71.4%
0.0%
28.6%
0.0%
0.0%
0.0%
0.0%
28.6%
128.6%
NEW ENG
39.7%
13.2%
6.0%
5.3%
28.7%
93.0%
0.0%
0.0%
0.0%
0.4%
0.4%
0.0%
2.3%
1.3%
0.0%
3.0%
6.6%
100.0%
25.8%
9.4%
13.2%
6.7%
1.0%
7.8%
3.5%
58.8%
126.4%
35.3%
9.0%
19.6%
9.0%
0.0%
0.0%
0.0%
64.7%
137.6%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 4
SUBSLAB PREPARATION -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
CT & RI & MA
83.0%
3.9%
15.5%
9.7%
26.8%
33.7%
43.3%
0.0%
16.9%
232.8%
ME&NH&VT
67.9%
0.0%
21.4%
7.1%
37.5%
30.4%
37.5%
1.8%
32.1%
235.7%
NEW ENG
77.4%
2.5%
17.7%
8.8%
30.7%
32.5%
41.2%
0.7%
22.5%
233.9%
SUBSLAB PREPARATION -- BASEMENTS
(Multiple Answers Possible)
Dwellings On Basements
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
82.4%
4.0%
16.0%
8.7%
26.3%
32.9%
44.3%
0.0%
16.1%
230.6%
63.3%
0.0%
16.3%
2.0%
32.7%
26.5%
32.7%
2.0%
34.7%
210.2%
75.3%
2.5%
16.1%
6.2%
28.6%
30.6%
40.0%
0.8%
22.9%
223.1%
SUBSLAB PREPARATION -- SLABS
(Multiple Answers Possible)
Dwellings On Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
100.0%
0.0%
0.0%
42.9%
42.9%
57.1%
14.3%
0.0%
42.9%
300.0%
100.0%
0.0%
57.1%
42.9%
71.4%
57.1%
71.4%
0.0%
14.3%
414.3%
100.0%
0.0%
21.1%
42.9%
53.4%
57.1%
35.3%
0.0%
32.3%
342.1%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGES
CT & RI & MA
ME&NH&VT
COST OF PASSIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
26
14.7%
16.2%
8.8%
19.1%
32.4%
0.0%
100.0%
13
16.7%
38.9%
11.1%
11.1%
22.2%
0.0%
0.0%
100.0%
39
15.3%
22.9%
9.5%
16.7%
29.3%
0.0%
6.2%
100.0%
COST OF ACTIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
11
0.0%
5.6%
58.3%
0.0%
0.0%
5.6%
30.6%
100.0%
0.0%
0.0%
0.0%
0.0%
100.0%
0.0%
0.0%
100.0%
12
0.0%
4.1%
42.6%
0.0%
27.0%
4.1%
22.3%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGES
SAMPLE SIZE
Units
Builders
WGHTD AVERAGE UNITS PER BLDR
TYPE OF HOUSE: WITH RADON REDUCING FEATURES
One Story Dwellings With Basements
With radon reducing features
No radon reducing features
One story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
One Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Two Story Dwellings With Basements
With radon reducing features
No radon reducing features
Two Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Three Story Dwellings With Basements
With radon reducing features
No radon reducing features
Three Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATION -- EXCEPT PIERS
Basements
With radon reducing features
No radon reducing features
Crawl Spaces
With radon reducing features
No radon reducing features
Slabs on Grade
With radon reducing features
No radon reducing features
TOTAL
ALL DWELLINGS -- EXCEPT ON PIERS
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
-
73
32
2.3
0.0%
15.1%
0.0%
2.7%
0.0%
0.0%
21.9%
37.0%
0.0%
6.8%
0.0%
13.7%
0.0%
0.0%
0.0%
2.7%
0.0%
0.0%
0.0%
100.0%
21.9%
52.1%
0.0%
12.3%
0.0%
13.7%
100.0%
21.9%
78.1%
100.0%
NY
158
40
3.9
2.0%
33.5%
0.0%
1.0%
0.0%
4.7%
11.2%
42.5%
0.0%
1.5%
0.0%
0.7%
0.0%
0.6%
0.0%
0.0%
0.0%
0.0%
2.2%
100.0%
13.5%
78.4%
0.0%
2.5%
0.0%
5.6%
100.0%
13.5%
86.5%
100.0%
PA
123
49
2.5
11.7%
33.3%
0.0%
0.8%
0.5%
0.8%
17.9%
34.6%
0.0%
0.0%
0.3%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
29.6%
68.0%
0.0%
0.8%
0.8%
0.8%
100.0%
30.4%
69.6%
100.0%
MID ATL 1
354
121
2.9
6.1%
29.0%
0.0%
1.3%
0.3%
1.8%
16.9%
37.5%
0.0%
2.1%
0.1%
3.5%
0.0%
0.2%
0.0%
0.7%
0.0%
0.0%
0.6%
100.0%
23.1%
67.2%
0.0%
4.1%
0.4%
5.3%
100.0%
23.5%
76.5%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 7
TESTING OF DWELLINGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units With Basements
Tested For Radon Levels
Tested Units Needing More Work
Units With Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units With Slabs
Tested For Radon Levels
Tested Units Needing More Work
-
40.4%
5.1%
38.0%
7.3%
100.0%
0.0%
0.0%
0.0%
NY
10.8%
0.0%
11.8%
0.0%
0.0%
0.0%
0.0%
0.0%
PA
25.9%
28.8%
26.1%
29.2%
0.0%
0.0%
25.0%
5.0%
MID ATL
24.9%
16.0%
24.2%
18.3%
72.7%
0.0%
3.4%
5.0%
CONSTRUCTION METHOD
DWELLINGS WITH RADON REDUCING FEATURES
Conventional Constructed On Site
With radon reducing features
No radon reducing features
Prefabricated Units (Panelized)
With radon reducing features
No radon reducing features
Modular
With radon reducing features
No radon reducing features
ALL Dwellings
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
21.9%
78.1%
0.0%
0.0%
0.0%
0.0%
21.9%
78.1%
100.0%
13.5%
86.5%
0.0%
0.0%
0.0%
0.0%
13.5%
86.5%
100.0%
30.4%
69.6%
0.0%
0.0%
0.0%
0.0%
30.4%
69.6%
100.0%
23.5%
76.5%
0.0%
0.0%
0.0%
0.0%
23.5%
76.5%
100.0%
SIZE OF BUILDER
DWELLINGS WITH RADON REDUCING FEATURES
One to Ten Dwellings Per Year
With radon reducing features
No radon reducing features
Eleven To Twenty-Five Dwellings Per Year
With radon reducing features
No radon reducing features
Twenty-Six To 100 Dwellings Per Year
With radon reducing features
No radon reducing features
Over 100 Dwellings Per Year
With radon reducing features
No radon reducing features
21.9%
68.5%
0.0%
9.6%
0.0%
0.0%
0.0%
0.0%
12.3%
48.4%
0.0%
15.2%
1.3%
10.2%
0.0%
12.7%
30.4%
48.5%
0.0%
21.1%
0.0%
0.0%
0.0%
0.0%
23.1%
53.2%
0.0%
16.7%
0.4%
3.0%
0.0%
3.7%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGES
METHODS EMPLOYED TO REDUCE RADON
Dwellings With Basements
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - BASEMENTS
Dwellings With Crawl Spaces
Passive stack subslab ventilation
Fan-driven (active) ventilation
Foundation Wall Vents
None
SUBTOTAL - CRAWL SPACES
Dwellings With Slabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALING METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings With Basements
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
SEALING METHODS - SLABS
(Multiple Answers Possible)
Dwellings With Slabs
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
-
13.7%
13.7%
8.2%
9.6%
28.8%
74.0%
0.0%
0.0%
2.7%
9.6%
12.3%
0.0%
0.0%
0.0%
5.5%
8.2%
13.7%
100.0%
48.2%
7.4%
25.9%
5.6%
9.3%
29.6%
0.0%
46.3%
172.2%
40.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
60.0%
100.0%
NY
16.5%
12.7%
0.8%
30.5%
31.3%
91.9%
0.0%
0.0%
0.0%
2.5%
2.5%
0.0%
0.0%
0.0%
0.0%
5.6%
5.6%
100.0%
44.6%
18.7%
6.6%
3.1%
0.0%
0.7%
0.0%
48.5%
122.1%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
100.0%
PA
34.3%
27.1%
2.5%
18.7%
15.0%
97.6%
0.0%
0.0%
0.0%
0.8%
0.8%
0.0%
0.8%
0.0%
0.8%
0.0%
1.6%
100.0%
73.3%
2.5%
22.5%
3.3%
0.0%
27.5%
0.0%
24.2%
153.3%
100.0%
50.0%
50.0%
0.0%
0.0%
0.0%
0.0%
0.0%
200.0%
MID ATL
24.2%
19.7%
3.4%
20.0%
23.0%
90.3%
0.0%
0.0%
0.7%
3.4%
4.1%
0.0%
0.4%
0.0%
1.7%
3.6%
5.7%
100.0%
58.9%
8.4%
18.7%
3.8%
2.2%
20.2%
0.0%
36.5%
148.8%
56.6%
23.5%
23.5%
0.0%
0.0%
0.0%
0.0%
43.4%
147.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGES
SUBSLAB PREPARATION -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
-
70.3%
12.5%
0.0%
0.0%
14.1%
28.1%
70.3%
7.8%
17.2%
220.3%
NY
79.8%
7.2%
8.5%
0.7%
31.3%
53.8%
47.6%
7.8%
8.1%
244.6%
PA
95.9%
2.5%
0.0%
0.8%
43.4%
61.5%
91.0%
0.0%
4.1%
299.2%
MID ATL
85.1%
6.2%
2.5%
0.6%
32.9%
51.3%
73.4%
4.1%
8.4%
264.5%
SUBSLAB PREPARATION -- BASEMENTS
(Multiple Answers Possible)
Dwellings On Basements
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
72.2%
14.8%
0.0%
0.0%
16.7%
33.3%
75.9%
9.3%
13.0%
235.2%
82.7%
3.5%
9.0%
0.7%
27.1%
56.3%
45.6%
8.3%
8.6%
241.8%
95.8%
2.5%
0.0%
0.8%
43.3%
61.7%
90.8%
0.0%
4.2%
299.2%
86.4%
5.7%
2.6%
0.6%
32.2%
53.3%
74.1%
4.6%
7.6%
267.2%
SUBSLAB PREPARATION -- SLABS
(Multiple Answers Possible)
Dwellings On Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
60.0%
0.0%
0.0%
0.0%
0.0%
0.0%
40.0%
0.0%
40.0%
140.0%
31.7%
68.4%
0.0%
0.0%
100.0%
11.4%
79.8%
0.0%
0.0%
291.1%
100.0%
0.0%
0.0%
0.0%
50.0%
50.0%
100.0%
0.0%
0.0%
300.0%
70.6%
19.9%
0.0%
0.0%
52.6%
26.8%
79.8%
0.0%
9.5%
259.2%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 10
COST OF PASSIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
10
25.0%
8.3%
16.7%
33.3%
12.5%
0.0%
4.2%
100.0%
27.9%
41.2%
27.9%
0.0%
1.5%
0.0%
1.5%
100.0%
29
17.4%
44.9%
23.2%
7.3%
1.5%
1.5%
4.4%
100.0%
47
20.6%
38.3%
23.0%
10.2%
3.3%
0.9%
3.8%
100.0%
COST OF ACTIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
10
20.8%
58.3%
8.3%
0.0%
0.0%
12.5%
0.0%
100.0%
70.6%
0.0%
0.0%
0.0%
0.0%
0.0%
29.4%
100.0%
20.5%
30.8%
23.1%
7.7%
0.0%
18.0%
0.0%
100.0%
22
24.3%
44.5%
12.9%
2.7%
0.0%
13.5%
2.1%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 11
SAMPLE SIZE
Units
Builders
WGHTD AVERAGE UNITS PER BLDR
TYPE OF HOUSE: WITH RADON REDUCING FEATURES
One Story Dwellings With Basements
With radon reducing features
No radon reducing features
One story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
One Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Two Story Dwellings With Basements
With radon reducing features
No radon reducing features
Two Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Three Story Dwellings With Basements
With radon reducing features
No radon reducing features
Three Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATION -- EXCEPT PIERS
Basements
With radon reducing features
No radon reducing features
Crawl Spaces
With radon reducing features
No radon reducing features
Slabs on Grade
With radon reducing features
No radon reducing features
TOTAL
ALL DWELLINGS -- EXCEPT ON PIERS
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
"
185
32
5.8
8.8%
43.7%
2.7%
2.7%
0.0%
0.5%
6.9%
33.1%
1.1%
0.5%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
15.7%
76.8%
3.8%
3.2%
0.0%
0.5%
100.0%
19.5%
80.5%
100.0%
-
177
47
3.8
6.3%
35.8%
11.9%
6.3%
0.6%
16.1%
1.7%
14.7%
0.7%
2.9%
0.0%
1.9%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
1.1%
100.0%
8.1%
51.1%
12.8%
9.3%
0.6%
18.3%
100.0%
21.4%
78.6%
100.0%
MI
118
43
2.7
8.8%
37.5%
2.8%
6.0%
0.2%
3.6%
8.7%
21.8%
0.6%
8.6%
0.2%
0.2%
0.0%
0.9%
0.0%
0.0%
0.0%
0.2%
0.0%
100.0%
17.5%
60.2%
3.4%
14.6%
0.4%
3.9%
100.0%
21.3%
78.7%
100.0%
«
192
37
5.2
10.2%
30.5%
0.0%
1.3%
0.2%
5.4%
14.4%
37.4%
0.0%
0.5%
0.0%
0.1%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.1%
100.0%
24.6%
67.9%
0.0%
1.9%
0.2%
5.5%
100.0%
24.7%
75.3%
100.0%
WI
199
40
5.0
30.1%
31.3%
0.8%
1.6%
0.7%
0.9%
16.3%
13.9%
0.8%
1.4%
0.5%
0.5%
0.4%
0.6%
0.0%
0.0%
0.0%
0.0%
0.1%
100.0%
46.9%
45.9%
1.6%
3.1%
1.2%
1.4%
100.0%
49.7%
50.3%
100.0%
E N CEN 1
871
199
4.4
12.1%
35.5%
3.9%
3.7%
0.3%
6.0%
9.3%
24.4%
0.6%
2.8%
0.1%
0.6%
0.1%
0.3%
0.0%
0.0%
0.0%
0.0%
0.3%
100.0%
21.5%
60.3%
4.6%
6.5%
0.5%
6.6%
100.0%
26.5%
73.5%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 12
TESTING OF DWELLINGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units With Basements
Tested For Radon Levels
Tested Units Needing More Work
Units With Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units With Slabs
Tested For Radon Levels
Tested Units Needing More Work
"
41.1%
55.1%
44.5%
55.1%
0.0%
0.0%
0.0%
0.0%
-
11.4%
10.3%
6.3%
31.5%
33.6%
0.0%
1.5%
0.0%
MI
24.9%
10.3%
25.9%
12.8%
24.1%
0.0%
9.9%
0.0%
«
12.7%
19.6%
12.7%
18.2%
32.8%
14.1%
5.0%
88.6%
WI
23.4%
9.2%
24.8%
9.3%
8.4%
0.0%
0.0%
0.0%
ENCEN
21.5%
26.2%
22.6%
30.0%
25.1%
0.7%
3.1%
26.8%
CONSTRUCTION METHOD
DWELLINGS WITH RADON REDUCING FEATURES
Conventional Constructed On Site
With radon reducing features
No radon reducing features
Prefabricated Units (Panelized)
With radon reducing features
No radon reducing features
Modular
With radon reducing features
No radon reducing features
ALL Dwellings
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
19.5%
80.5%
0.0%
0.0%
0.0%
0.0%
19.5%
80.5%
100.0%
21.4%
78.6%
0.0%
0.0%
0.0%
0.0%
21.4%
78.6%
100.0%
21.3%
78.7%
0.0%
0.0%
0.0%
0.0%
21.3%
78.7%
100.0%
24.7%
75.3%
0.0%
0.0%
0.0%
0.0%
24.7%
75.3%
100.0%
49.7%
50.3%
0.0%
0.0%
0.0%
0.0%
49.7%
50.3%
100.0%
26.5%
73.5%
0.0%
0.0%
0.0%
0.0%
26.5%
73.5%
100.0%
SIZE OF BUILDER
DWELLINGS WITH RADON REDUCING FEATURES
One to Ten Dwellings Per Year
With radon reducing features
No radon reducing features
Eleven To Twenty-Five Dwellings Per Year
With radon reducing features
No radon reducing features
Twenty-Six To 100 Dwellings Per Year
With radon reducing features
No radon reducing features
Over 100 Dwellings Per Year
With radon reducing features
No radon reducing features
11.4%
32.4%
6.0%
16.2%
2.2%
31.9%
0.0%
0.0%
9.0%
52.0%
12.4%
5.7%
0.0%
6.8%
0.0%
14.1%
18.6%
63.7%
0.8%
6.9%
2.0%
8.1%
0.0%
0.0%
13.9%
32.9%
4.4%
1.9%
3.9%
30.0%
2.6%
10.4%
13.8%
35.9%
32.0%
5.2%
3.9%
9.2%
0.0%
0.0%
13.2%
43.9%
10.4%
6.8%
2.3%
17.1%
0.6%
5.7%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 13
METHODS EMPLOYED TO REDUCE RADON
Dwellings With Basements
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - BASEMENTS
Dwellings With Crawl Spaces
Passive stack subslab ventilation
Fan-driven (active) ventilation
Foundation Wall Vents
None
SUBTOTAL - CRAWL SPACES
Dwellings With Slabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALING METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings With Basements
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
SEALING METHODS - SLABS
(Multiple Answers Possible)
Dwellings With Slabs
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
"
16.8%
13.0%
2.7%
11.9%
48.1%
92.5%
3.8%
0.0%
0.0%
3.2%
7.0%
0.5%
0.0%
0.0%
0.0%
0.0%
0.5%
100.0%
30.4%
1.8%
6.4%
5.3%
0.0%
8.8%
0.0%
65.5%
118.1%
100.0%
0.0%
0.0%
0.0%
0.0%
100.0%
0.0%
0.0%
200.0%
-
6.0%
7.5%
0.6%
25.6%
19.5%
59.1%
12.8%
0.0%
1.7%
7.6%
22.0%
0.0%
0.6%
0.0%
10.5%
7.7%
18.8%
100.0%
47.2%
27.1%
10.5%
9.6%
4.8%
14.7%
0.0%
40.4%
154.2%
59.0%
37.9%
15.0%
0.0%
0.0%
40.9%
0.0%
41.1%
193.9%
MI
18.7%
15.5%
2.0%
15.9%
25.7%
77.7%
3.4%
0.0%
5.9%
8.7%
18.0%
0.9%
0.4%
0.0%
1.7%
1.3%
4.3%
100.0%
50.6%
6.6%
35.3%
19.6%
0.0%
43.0%
0.0%
37.4%
192.5%
29.6%
39.3%
9.9%
0.0%
0.0%
9.9%
0.0%
31.1%
119.8%
«
27.5%
22.8%
1.8%
19.1%
21.4%
92.5%
0.0%
0.0%
0.5%
1.3%
1.9%
0.8%
0.2%
0.0%
2.1%
2.6%
5.7%
100.0%
47.6%
5.5%
33.1%
18.4%
0.0%
19.7%
0.0%
31.0%
155.3%
54.3%
14.3%
3.3%
3.3%
0.0%
0.0%
0.0%
45.8%
121.0%
WI
12.1%
29.3%
17.6%
29.3%
4.4%
92.8%
1.6%
0.0%
0.0%
3.1%
4.7%
0.3%
1.0%
0.3%
0.6%
0.5%
2.6%
100.0%
88.5%
20.6%
43.1%
1.6%
0.0%
56.9%
0.0%
7.5%
218.2%
57.3%
19.6%
3.3%
0.0%
0.0%
19.6%
0.0%
39.4%
139.2%
ENCEN
16.3%
17.1%
4.3%
20.4%
23.6%
81.8%
4.6%
0.0%
1.7%
4.9%
11.1%
0.5%
0.4%
0.0%
3.4%
2.8%
7.1%
100.0%
51.9%
12.6%
25.3%
11.5%
1.1%
27.4%
0.0%
36.5%
166.4%
58.9%
23.2%
6.8%
0.8%
0.0%
32.0%
0.0%
32.8%
154.5%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 14
SUBSLAB PREPARATION -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
"
83.2%
15.7%
22.1%
9.9%
16.9%
47.7%
65.7%
1.2%
1.7%
263.9%
-
71.7%
8.7%
23.9%
3.6%
37.7%
50.0%
76.1%
3.6%
17.4%
292.8%
MI
77.3%
3.1%
30.0%
0.0%
48.6%
36.2%
59.7%
0.0%
10.1%
264.9%
«
80.2%
5.8%
2.3%
6.4%
27.3%
40.5%
52.2%
0.0%
12.5%
227.2%
WI
73.2%
7.4%
9.5%
0.0%
29.8%
17.1%
69.8%
4.2%
12.9%
224.1%
ENCEN
77.0%
7.9%
17.4%
4.0%
32.6%
39.2%
64.5%
1.7%
11.4%
255.8%
SUBSLAB PREPARATION -- BASEMENTS
(Multiple Answers Possible)
Dwellings On Basements
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
83.1%
15.8%
22.2%
9.9%
17.0%
47.4%
65.5%
1.2%
1.2%
263.1%
64.7%
11.5%
18.5%
4.8%
27.1%
51.9%
68.5%
4.8%
22.9%
274.6%
80.4%
3.3%
27.3%
0.0%
46.9%
36.0%
61.8%
0.0%
10.1%
265.8%
82.1%
4.0%
1.0%
6.8%
22.8%
37.4%
51.5%
0.0%
12.4%
217.9%
73.6%
7.2%
9.2%
0.0%
28.4%
16.4%
69.5%
4.3%
11.7%
220.3%
76.4%
8.1%
15.3%
4.4%
28.5%
38.8%
62.9%
2.0%
12.4%
248.9%
SUBSLAB PREPARATION -- SLABS
(Multiple Answers Possible)
Dwellings On Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
100.0%
0.0%
0.0%
0.0%
0.0%
100.0%
100.0%
0.0%
100.0%
400.0%
94.0%
0.0%
40.9%
0.0%
71.0%
43.9%
100.0%
0.0%
0.0%
349.8%
21.4%
0.0%
78.6%
0.0%
78.6%
39.3%
21.4%
0.0%
9.9%
249.2%
49.1%
36.6%
23.5%
0.0%
100.0%
90.9%
63.4%
0.0%
14.3%
377.7%
59.3%
17.8%
19.6%
0.0%
80.2%
42.7%
80.4%
0.0%
59.3%
359.3%
64.6%
11.4%
33.8%
0.0%
68.4%
63.3%
72.8%
0.0%
32.3%
346.5%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 15
"
-
MI
«
WI
ENCEN
COST OF PASSIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
19
23.0%
41.9%
4.7%
2.0%
0.0%
0.0%
28.4%
100.0%
13
50.0%
21.9%
12.5%
15.6%
0.0%
0.0%
0.0%
100.0%
15
37.9%
31.8%
22.7%
0.0%
0.0%
7.6%
0.0%
100.0%
13
38.5%
43.9%
0.8%
15.4%
1.5%
0.0%
0.0%
100.0%
20
14.1%
24.4%
36.3%
19.3%
3.7%
0.0%
2.2%
100.0%
80
33.1%
32.1%
16.1%
12.0%
1.2%
1.3%
4.2%
100.0%
COST OF ACTIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
0.0%
19.5%
12.6%
0.0%
28.7%
37.9%
1.2%
100.0%
21.1%
0.0%
15.8%
5.3%
57.9%
0.0%
0.0%
100.0%
14.7%
0.0%
61.8%
0.0%
2.9%
20.6%
0.0%
100.0%
0.0%
23.1%
0.0%
38.5%
19.2%
0.0%
19.2%
100.0%
13
23.9%
5.4%
3.3%
22.8%
30.4%
14.1%
0.0%
100.0%
35
18.2%
7.9%
9.7%
19.2%
27.5%
15.5%
1.9%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 16
SAMPLE SIZE
Units
Builders
WGHTD AVERAGE UNITS PER BLDR
TYPE OF HOUSE: WITH RADON REDUCING FEATURES
One Story Dwellings With Basements
With radon reducing features
No radon reducing features
One story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
One Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Two Story Dwellings With Basements
With radon reducing features
No radon reducing features
Two Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Three Story Dwellings With Basements
With radon reducing features
No radon reducing features
Three Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATION -- EXCEPT PIERS
Basements
With radon reducing features
No radon reducing features
Crawl Spaces
With radon reducing features
No radon reducing features
Slabs on Grade
With radon reducing features
No radon reducing features
TOTAL
ALL DWELLINGS -- EXCEPT ON PIERS
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
IA & NE
280
41
6.8
24.8%
50.0%
0.0%
0.0%
0.0%
0.0%
10.9%
14.3%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
35.7%
64.3%
0.0%
0.0%
0.0%
0.0%
100.0%
35.7%
64.3%
100.0%
KS&MO
177
42
4.2
14.7%
47.9%
0.0%
6.9%
0.0%
3.6%
2.1%
22.9%
0.0%
0.0%
0.0%
0.3%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
1.6%
100.0%
17.1%
72.0%
0.0%
7.0%
0.0%
4.0%
100.0%
17.1%
83.0%
100.0%
MN
155
51
3.0
32.2%
8.4%
0.0%
0.0%
3.3%
0.0%
47.3%
1.8%
0.0%
1.3%
3.5%
0.3%
1.7%
0.2%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
81.2%
10.4%
0.0%
1.3%
6.8%
0.3%
100.0%
88.0%
12.0%
100.0%
ND&SD
141
37
3.8
29.3%
50.8%
0.0%
5.8%
1.2%
2.1%
0.2%
10.4%
0.0%
0.0%
0.2%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
29.5%
61.2%
0.1%
5.8%
1.4%
2.1%
100.0%
31.0%
69.1%
100.0%
W N CEN I
753
171
4.7
23.8%
40.4%
0.0%
3.0%
0.9%
1.5%
14.4%
13.8%
0.0%
0.3%
0.8%
0.2%
0.4%
0.0%
0.0%
0.0%
0.0%
0.0%
0.5%
100.0%
38.7%
54.6%
0.0%
3.4%
1.7%
1.7%
100.0%
40.4%
59.6%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 17
TESTING OF DWELLINGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units With Basements
Tested For Radon Levels
Tested Units Needing More Work
Units With Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units With Slabs
Tested For Radon Levels
Tested Units Needing More Work
34.4%
26.1%
34.4%
26.1%
0.0%
0.0%
0.0%
0.0%
19.1%
15.6%
21.0%
15.7%
0.8%
10.0%
9.0%
10.0%
19.3%
4.9%
17.2%
6.1%
100.0%
0.0%
31.8%
0.0%
26.5%
65.6%
26.5%
72.5%
5.5%
0.0%
63.2%
0.0%
25.0%
26.1%
25.5%
27.5%
10.4%
0.5%
27.8%
1.2%
CONSTRUCTION METHOD
DWELLINGS WITH RADON REDUCING FEATURES
Conventional Constructed On Site
With radon reducing features
No radon reducing features
Prefabricated Units (Panelized)
With radon reducing features
No radon reducing features
Modular
With radon reducing features
No radon reducing features
ALL Dwellings
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
35.7%
64.3%
0.0%
0.0%
0.0%
0.0%
35.7%
64.3%
100.0%
17.1%
83.0%
0.0%
0.0%
0.0%
0.0%
17.1%
83.0%
100.0%
88.0%
12.0%
0.0%
0.0%
0.0%
0.0%
88.0%
12.0%
100.0%
31.0%
69.1%
0.0%
0.0%
0.0%
0.0%
31.0%
69.1%
100.0%
40.4%
59.6%
0.0%
0.0%
0.0%
0.0%
40.4%
59.6%
100.0%
SIZE OF BUILDER
DWELLINGS WITH RADON REDUCING FEATURES
One to Ten Dwellings Per Year
With radon reducing features
No radon reducing features
Eleven To Twenty-Five Dwellings Per Year
With radon reducing features
No radon reducing features
Twenty-Six To 100 Dwellings Per Year
With radon reducing features
No radon reducing features
Over 100 Dwellings Per Year
With radon reducing features
No radon reducing features
13.8%
20.5%
5.4%
17.4%
16.4%
26.4%
0.0%
0.0%
2.9%
67.6%
14.1%
5.2%
0.0%
10.2%
0.0%
0.0%
58.3%
12.0%
0.0%
0.0%
14.2%
0.0%
15.5%
0.0%
31.0%
52.0%
0.0%
17.0%
0.0%
0.0%
0.0%
0.0%
22.5%
38.4%
6.2%
9.6%
8.3%
11.6%
3.4%
0.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 18
METHODS EMPLOYED TO REDUCE RADON
Dwellings With Basements
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - BASEMENTS
Dwellings With Crawl Spaces
Passive stack subslab ventilation
Fan-driven (active) ventilation
Foundation Wall Vents
None
SUBTOTAL - CRAWL SPACES
Dwellings With Slabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALING METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings With Basements
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
SEALING METHODS - SLABS
(Multiple Answers Possible)
Dwellings With Slabs
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
IA & NE
39.8%
29.0%
6.7%
3.9%
20.7%
100.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
57.5%
27.9%
4.6%
0.4%
0.0%
23.2%
0.4%
39.3%
153.2%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
KS&MO
12.7%
15.9%
1.1%
30.1%
29.1%
89.0%
0.0%
0.0%
0.0%
7.0%
7.0%
0.6%
0.0%
0.0%
2.9%
0.6%
4.0%
100.0%
45.0%
7.0%
10.6%
1.3%
0.0%
15.9%
0.0%
43.1%
122.8%
56.1%
0.0%
29.9%
0.0%
0.0%
0.0%
0.0%
14.0%
100.0%
MN
3.9%
75.8%
5.4%
2.6%
3.9%
91.6%
0.0%
0.0%
0.0%
1.3%
1.3%
0.0%
6.8%
0.0%
0.3%
0.0%
7.1%
100.0%
68.3%
27.5%
67.6%
46.5%
1.4%
54.9%
0.0%
8.5%
274.7%
72.7%
18.2%
45.5%
9.1%
9.1%
63.6%
0.0%
0.0%
218.2%
ND&SD
19.2%
29.2%
0.3%
25.0%
17.0%
90.7%
0.1%
0.0%
0.0%
5.8%
5.9%
1.4%
1.4%
0.0%
0.0%
0.7%
3.5%
100.0%
68.7%
7.3%
6.1%
5.3%
1.9%
10.0%
0.8%
21.1%
121.3%
59.2%
30.7%
18.3%
18.3%
10.3%
38.7%
0.0%
20.4%
196.0%
WNCEN
20.3%
35.0%
3.7%
15.1%
19.2%
93.3%
0.0%
0.0%
0.0%
3.4%
3.4%
0.4%
1.7%
0.0%
1.0%
0.3%
3.3%
100.0%
57.5%
18.1%
20.4%
11.4%
0.6%
25.8%
0.2%
31.2%
165.2%
42.4%
8.4%
22.1%
4.6%
3.5%
19.5%
0.0%
7.5%
108.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 19
SUBSLAB PREPARATION -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
75.0%
7.1%
12.9%
4.3%
12.1%
65.7%
78.6%
8.6%
12.1%
276.4%
90.3%
0.6%
4.9%
0.0%
17.0%
43.0%
70.3%
0.0%
11.5%
237.5%
92.2%
3.9%
49.7%
3.3%
58.8%
51.0%
81.1%
19.0%
7.2%
366.0%
87.3%
3.0%
12.8%
0.0%
7.5%
63.3%
71.5%
2.3%
6.2%
253.9%
85.4%
3.7%
18.3%
2.1%
23.2%
54.9%
75.4%
7.2%
10.0%
280.1%
SUBSLAB PREPARATION -- BASEMENTS
(Multiple Answers Possible)
Dwellings On Basements
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
75.0%
7.1%
12.9%
4.3%
12.1%
65.7%
78.6%
8.6%
12.1%
276.4%
89.9%
0.6%
5.1%
0.0%
17.8%
43.6%
69.6%
0.0%
12.1%
238.5%
92.3%
4.2%
52.1%
2.8%
57.0%
49.3%
80.3%
19.7%
7.8%
365.5%
87.2%
3.1%
11.7%
0.0%
5.5%
62.6%
72.3%
0.8%
5.8%
249.0%
85.3%
3.8%
18.7%
2.0%
22.7%
54.6%
75.1%
7.1%
10.2%
279.6%
SUBSLAB PREPARATION -- SLABS
(Multiple Answers Possible)
Dwellings On Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
0.0%
0.0%
0.0%
0.0%
29.9%
86.0%
0.0%
0.0%
215.9%
90.9%
0.0%
18.2%
9.1%
81.8%
72.7%
90.9%
9.1%
0.0%
372.7%
89.7%
0.0%
40.8%
0.0%
61.3%
81.7%
48.8%
40.8%
18.3%
381.5%
64.9%
0.0%
9.9%
2.0%
26.7%
37.3%
54.5%
7.9%
2.7%
205.8%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 20
COST OF PASSIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
20
58.6%
10.5%
26.8%
0.0%
1.8%
0.0%
2.3%
100.0%
15
58.6%
24.3%
1.4%
0.0%
12.9%
2.9%
0.0%
100.0%
44
6.2%
40.0%
11.0%
12.4%
19.3%
1.4%
9.7%
100.0%
13
3.9%
74.5%
0.0%
9.8%
7.8%
3.9%
0.0%
100.0%
92
26.3%
34.6%
12.3%
7.3%
12.6%
1.6%
5.3%
100.0%
COST OF ACTIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
12
30.0%
29.2%
3.3%
4.2%
1.7%
31.7%
0.0%
100.0%
21.7%
1.7%
15.0%
23.3%
35.0%
3.3%
0.0%
100.0%
16
7.8%
2.0%
19.6%
7.8%
0.0%
15.7%
47.1%
100.0%
0.0%
57.1%
0.0%
0.0%
14.3%
28.6%
0.0%
100.0%
40
21.8%
18.1%
9.6%
7.2%
4.6%
23.8%
15.0%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 21
SAMPLE SIZE
Units
Builders
WGHTD AVERAGE UNITS PER BLDR
TYPE OF HOUSE: WITH RADON REDUCING FEATURES
One Story Dwellings With Basements
With radon reducing features
No radon reducing features
One story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
One Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Two Story Dwellings With Basements
With radon reducing features
No radon reducing features
Two Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Three Story Dwellings With Basements
With radon reducing features
No radon reducing features
Three Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATION -- EXCEPT PIERS
Basements
With radon reducing features
No radon reducing features
Crawl Spaces
With radon reducing features
No radon reducing features
Slabs on Grade
With radon reducing features
No radon reducing features
TOTAL
ALL DWELLINGS -- EXCEPT ON PIERS
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
DE & MD
355
38
9.3
2.8%
8.1%
0.0%
7.9%
0.3%
3.8%
50.6%
20.0%
0.0%
3.4%
0.0%
1.2%
1.4%
0.0%
0.0%
0.2%
0.0%
0.0%
0.3%
100.0%
55.0%
28.2%
0.0%
11.5%
0.3%
5.0%
100.0%
55.2%
44.8%
100.0%
NOFL
274
50
5.5
0.0%
0.3%
0.0%
0.5%
0.0%
73.7%
0.0%
1.1%
0.0%
0.2%
0.0%
21.6%
0.0%
0.0%
0.0%
0.0%
0.0%
0.4%
2.2%
100.0%
0.0%
1.4%
0.0%
0.7%
0.0%
97.8%
100.0%
0.0%
100.0%
100.0%
SOFL
72
28
2.6
0.0%
1.6%
0.0%
0.7%
7.8%
55.8%
0.0%
5.8%
0.0%
0.4%
0.0%
20.0%
0.0%
0.0%
0.0%
0.0%
0.0%
1.3%
6.6%
100.0%
0.0%
7.9%
0.0%
1.2%
8.3%
82.6%
100.0%
8.3%
91.7%
100.0%
«
146
43
3.4
3.0%
16.8%
0.0%
4.4%
2.1%
14.6%
3.8%
30.1%
0.0%
6.6%
0.4%
15.7%
1.4%
1.2%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
8.2%
48.1%
0.0%
11.0%
2.5%
30.3%
100.0%
10.7%
89.3%
100.0%
NC & SC
225
62
3.6
0.9%
3.2%
2.2%
17.6%
3.3%
12.8%
4.4%
2.0%
3.6%
20.2%
0.4%
26.1%
0.9%
0.9%
0.0%
0.0%
0.0%
0.0%
1.5%
100.0%
6.2%
6.2%
5.9%
38.4%
3.8%
39.5%
100.0%
15.9%
84.1%
100.0%
VA&WV
222
40
5.5
0.5%
24.9%
0.0%
7.0%
0.0%
0.3%
16.5%
26.8%
0.5%
9.7%
1.4%
5.7%
0.9%
5.0%
0.0%
0.9%
0.0%
0.0%
0.0%
100.0%
17.8%
56.7%
0.5%
17.6%
1.4%
6.1%
100.0%
19.6%
80.4%
100.0%
SATL 1
1294
261
4.7
1.0%
8.1%
0.7%
8.5%
2.2%
25.6%
9.5%
11.4%
1.3%
9.5%
0.4%
17.7%
0.7%
1.2%
0.0%
0.2%
0.0%
0.2%
1.6%
100.0%
11.3%
20.8%
2.0%
18.4%
2.7%
44.8%
100.0%
16.1%
83.9%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 22
TESTING OF DWELLINGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units With Basements
Tested For Radon Levels
Tested Units Needing More Work
Units With Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units With Slabs
Tested For Radon Levels
Tested Units Needing More Work
7.7%
6.6%
8.7%
7.0%
1.0%
0.0%
7.1%
0.0%
2.9%
0.0%
0.0%
0.0%
0.0%
0.0%
3.0%
0.0%
7.0%
0.0%
0.0%
0.0%
0.0%
0.0%
7.7%
0.0%
12.7%
15.1%
17.1%
15.0%
1.3%
50.0%
9.1%
13.9%
10.5%
10.7%
34.8%
7.0%
7.0%
8.0%
7.2%
18.6%
3.7%
7.6%
3.6%
10.3%
1.8%
0.0%
9.1%
0.0%
7.7%
9.3%
11.8%
9.9%
5.4%
8.3%
5.9%
8.8%
CONSTRUCTION METHOD
DWELLINGS WITH RADON REDUCING FEATURES
Conventional Constructed On Site
With radon reducing features 55.2%
No radon reducing features 44.8%
Prefabricated Units (Panelized)
With radon reducing features 0.0%
No radon reducing features 0.0%
Modular
With radon reducing features 0.0%
No radon reducing features 0.0%
ALL Dwellings
With radon reducing features 55.2%
No radon reducing features 44.8%
TOTAL -- ALL DWELLINGS 100.0%
0.0%
100.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
100.0%
8.3%
91.7%
0.0%
0.0%
0.0%
0.0%
8.3%
91.7%
100.0%
10.7%
89.3%
0.0%
0.0%
0.0%
0.0%
10.7%
89.3%
100.0%
15.9%
84.1%
0.0%
0.0%
0.0%
0.0%
15.9%
84.1%
100.0%
19.6%
80.4%
0.0%
0.0%
0.0%
0.0%
19.6%
80.4%
100.0%
16.1%
83.9%
0.0%
0.0%
0.0%
0.0%
16.1%
83.9%
100.0%
SIZE OF BUILDER
DWELLINGS WITH RADON REDUCING FEATURES
One to Ten Dwellings Per Year
With radon reducing features
No radon reducing features
Eleven To Twenty-Five Dwellings Per Year
With radon reducing features
No radon reducing features
Twenty-Six To 100 Dwellings Per Year
With radon reducing features
No radon reducing features
Over 100 Dwellings Per Year
With radon reducing features
No radon reducing features
4.8%
15.8%
13.2%
11.3%
11.8%
16.6%
25.4%
1.1%
0.0%
31.7%
0.0%
25.6%
0.0%
29.2%
0.0%
13.5%
8.3%
47.3%
0.0%
44.4%
0.0%
0.0%
0.0%
0.0%
10.1%
46.8%
0.6%
30.2%
0.0%
12.3%
0.0%
0.0%
15.9%
46.5%
0.0%
0.0%
0.0%
11.1%
0.0%
26.6%
6.5%
45.7%
0.0%
8.1%
13.1%
13.1%
0.0%
13.5%
9.0%
40.8%
1.4%
15.5%
3.2%
14.1%
2.5%
13.5%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 23
METHODS EMPLOYED TO REDUCE RADON
Dwellings With Basements
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - BASEMENTS
Dwellings With Crawl Spaces
Passive stack subslab ventilation
Fan-driven (active) ventilation
Foundation Wall Vents
None
SUBTOTAL - CRAWL SPACES
Dwellings With Slabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALING METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings With Basements
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
SEALING METHODS - SLABS
(Multiple Answers Possible)
Dwellings With Slabs
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
DE & MD
17.5%
53.3%
1.7%
4.7%
6.1%
83.2%
0.0%
0.0%
0.0%
11.5%
11.5%
0.0%
0.3%
0.0%
4.1%
0.9%
5.3%
100.0%
63.5%
1.4%
47.8%
13.6%
0.0%
27.5%
0.0%
17.8%
171.5%
77.0%
0.0%
5.3%
0.0%
0.0%
0.0%
0.0%
17.7%
100.0%
NOFL
0.0%
0.0%
0.0%
0.2%
1.3%
1.4%
0.0%
0.0%
0.2%
0.6%
0.7%
0.0%
0.0%
0.0%
62.1%
35.8%
97.8%
100.0%
12.7%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
87.3%
100.0%
52.3%
11.6%
3.4%
0.4%
0.0%
0.0%
0.0%
36.6%
104.1%
SOFL
5.6%
0.0%
0.0%
1.8%
0.5%
7.9%
0.0%
0.0%
0.2%
1.0%
1.2%
0.0%
8.3%
0.0%
54.9%
27.7%
90.9%
100.0%
93.3%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
6.7%
100.0%
65.0%
10.7%
3.1%
3.1%
0.0%
0.0%
0.0%
30.4%
112.2%
«
7.5%
2.7%
5.5%
26.1%
14.5%
56.3%
0.0%
0.0%
1.6%
9.4%
11.0%
3.7%
0.4%
2.1%
10.2%
16.4%
32.7%
100.0%
63.4%
14.6%
32.8%
30.4%
11.0%
12.2%
0.0%
25.7%
190.0%
29.1%
0.0%
31.4%
10.5%
0.0%
0.0%
0.0%
50.0%
120.9%
NC & SC
1.8%
4.9%
1.3%
2.4%
2.1%
12.4%
5.9%
0.0%
3.9%
34.5%
44.3%
0.0%
3.8%
0.0%
23.9%
15.6%
43.3%
100.0%
54.9%
3.6%
10.7%
21.4%
0.0%
0.0%
0.0%
45.1%
135.6%
59.9%
9.2%
2.6%
4.1%
1.0%
0.0%
0.0%
36.0%
112.8%
VA&WV
14.8%
17.6%
0.2%
24.1%
17.8%
74.5%
0.5%
0.0%
4.5%
13.1%
18.1%
0.0%
1.4%
0.0%
2.7%
3.4%
7.4%
100.0%
37.5%
1.2%
12.1%
1.2%
0.0%
38.1%
0.0%
26.2%
116.3%
54.5%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
45.5%
100.0%
SATL
6.2%
10.0%
1.3%
8.5%
6.1%
32.1%
2.0%
0.0%
2.2%
16.1%
20.4%
0.5%
2.5%
0.3%
27.1%
17.2%
47.5%
100.0%
50.9%
3.3%
14.3%
12.5%
1.4%
10.2%
0.0%
40.3%
132.9%
56.1%
6.3%
6.3%
3.1%
0.3%
0.0%
0.0%
36.9%
109.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 24
SUBSLAB PREPARATION -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Slabs
Crushed aggregate 4" or more deep 96.8%
Crushed aggregate less than 4" deep 1.4%
Sand 1.3%
Strips of geotextile drainage mat 0.6%
Sheets of rigid foam insulation 85.7%
Perforated plastic pipe 64.0%
Plastic sheet (vapor barrier) 85.7%
Other 16.7%
None 2.2%
TOTAL (may exceed 100%) 354.4%
2.2%
0.0%
60.0%
0.4%
0.0%
0.0%
84.7%
12.5%
3.7%
163.4%
18.3%
0.0%
66.6%
0.0%
0.0%
8.5%
63.0%
0.0%
8.1%
164.4%
67.7%
11.5%
13.1%
10.0%
3.1%
26.9%
82.8%
11.5%
4.6%
231.3%
49.2%
1.6%
50.2%
0.0%
20.7%
26.6%
90.7%
4.8%
8.6%
252.2%
69.2%
20.9%
6.1%
0.5%
54.4%
21.9%
58.8%
0.0%
3.5%
235.2%
47.7%
5.4%
37.3%
1.5%
24.2%
22.9%
80.2%
6.9%
5.7%
231.8%
SUBSLAB PREPARATION -- BASEMENTS
(Multiple Answers Possible)
Dwellings On Basements
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
97.6%
1.1%
0.0%
0.7%
86.6%
68.1%
86.2%
17.5%
1.9%
359.8%
0.0%
0.0%
50.9%
0.0%
0.0%
0.0%
87.3%
0.0%
100.0%
238.2%
70.8%
0.0%
17.7%
0.0%
0.0%
0.0%
88.5%
0.0%
29.2%
206.2%
74.5%
18.3%
0.0%
15.8%
4.9%
31.8%
82.0%
18.3%
3.7%
249.1%
76.3%
7.1%
7.1%
0.0%
17.8%
19.3%
76.3%
14.3%
23.7%
241.9%
73.4%
23.0%
1.8%
0.2%
49.8%
23.2%
54.7%
0.0%
3.9%
229.9%
63.6%
8.4%
13.6%
2.1%
22.9%
20.8%
77.9%
8.8%
30.0%
248.1%
SUBSLAB PREPARATION -- SLABS
(Multiple Answers Possible)
Dwellings On Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
84.0%
6.2%
21.2%
0.0%
71.7%
0.0%
77.0%
4.4%
6.2%
270.8%
2.2%
0.0%
60.1%
0.4%
0.0%
0.0%
84.7%
12.7%
2.2%
162.3%
13.8%
0.0%
70.8%
0.0%
0.0%
9.2%
60.8%
0.0%
6.3%
160.8%
56.0%
0.0%
35.6%
0.0%
0.0%
18.6%
84.2%
0.0%
6.3%
200.7%
41.5%
0.0%
62.6%
0.0%
21.5%
28.6%
94.8%
2.1%
4.2%
255.2%
27.3%
0.0%
48.5%
3.1%
100.0%
9.1%
100.0%
0.0%
0.0%
287.9%
35.4%
0.6%
53.4%
0.5%
29.8%
14.3%
87.0%
3.4%
3.9%
228.3%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 25
COST OF PASSIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
DE & MD
14
26.9%
17.9%
24.9%
6.5%
22.4%
0.0%
1.5%
100.0%
NOFL
5
100.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
SOFL
6
83.3%
0.0%
8.3%
0.0%
0.0%
8.3%
0.0%
100.0%
«
15
64.8%
1.9%
5.6%
11.1%
13.0%
0.0%
3.7%
100.0%
NC & SC
18
47.5%
22.0%
13.6%
3.4%
11.9%
1.7%
0.0%
100.0%
VA&WV
12
24.7%
63.9%
5.2%
1.0%
0.0%
0.0%
5.2%
100.0%
SATL
70
37.9%
27.3%
15.4%
4.0%
12.5%
1.1%
1.7%
100.0%
COST OF ACTIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
85.7%
2.0%
12.2%
0.0%
0.0%
0.0%
0.0%
100.0%
100.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
50.0%
50.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
25.7%
5.7%
20.0%
17.1%
0.0%
0.0%
31.4%
100.0%
64.3%
14.3%
7.1%
0.0%
0.0%
0.0%
14.3%
100.0%
51.9%
3.7%
0.0%
0.0%
0.0%
7.4%
37.0%
100.0%
29
43.4%
7.7%
15.2%
10.2%
0.0%
0.2%
23.5%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 26
SAMPLE SIZE
Units
Builders
WGHTD AVERAGE UNITS PER BLDR
TYPE OF HOUSE: WITH RADON REDUCING FEATURES
One Story Dwellings With Basements
With radon reducing features
No radon reducing features
One story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
One Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Two Story Dwellings With Basements
With radon reducing features
No radon reducing features
Two Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Three Story Dwellings With Basements
With radon reducing features
No radon reducing features
Three Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATION -- EXCEPT PIERS
Basements
With radon reducing features
No radon reducing features
Crawl Spaces
With radon reducing features
No radon reducing features
Slabs on Grade
With radon reducing features
No radon reducing features
TOTAL
ALL DWELLINGS -- EXCEPT ON PIERS
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
AL & MS
297
46
6.5
0.2%
2.7%
0.6%
33.6%
5.2%
42.7%
1.7%
1.7%
0.3%
1.2%
1.3%
6.9%
0.0%
0.0%
0.0%
0.0%
0.0%
0.3%
1.7%
100.0%
1.9%
4.4%
0.9%
35.4%
6.7%
50.8%
100.0%
9.4%
90.6%
100.0%
KY&TN
284
52
5.5
9.8%
7.9%
2.4%
18.1%
3.4%
11.6%
9.3%
5.0%
5.4%
13.1%
5.2%
8.5%
0.4%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
19.5%
12.9%
7.7%
31.2%
8.6%
20.1%
100.0%
35.8%
64.2%
100.0%
ESCEN
581
98
5.9
5.5%
5.6%
1.6%
25.0%
4.2%
25.3%
6.0%
3.5%
3.1%
7.8%
3.5%
7.8%
0.2%
0.0%
0.0%
0.0%
0.0%
0.1%
0.8%
100.0%
11.7%
9.1%
4.7%
33.1%
7.8%
33.7%
100.0%
24.2%
75.8%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 27
TESTING OF DWELLINGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units With Basements
Tested For Radon Levels
Tested Units Needing More Work
Units With Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units With Slabs
Tested For Radon Levels
Tested Units Needing More Work
0.3%
0.0%
5.4%
0.0%
0.0%
0.0%
0.0%
0.0%
6.3%
7.0%
11.2%
6.5%
11.5%
5.4%
1.4%
3.7%
8.6%
6.8%
10.0%
3.7%
11.5%
2.1%
1.4%
CONSTRUCTION METHOD
DWELLINGS WITH RADON REDUCING FEATURES
Conventional Constructed On Site
With radon reducing features
No radon reducing features
Prefabricated Units (Panelized)
With radon reducing features
No radon reducing features
Modular
With radon reducing features
No radon reducing features
ALL Dwellings
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
9.4%
90.6%
0.0%
0.0%
0.0%
0.0%
9.4%
90.6%
100.0%
35.8%
64.2%
0.0%
0.0%
0.0%
0.0%
35.8%
64.2%
100.0%
24.2%
75.8%
0.0%
0.0%
0.0%
0.0%
24.2%
75.8%
100.0%
SIZE OF BUILDER
DWELLINGS WITH RADON REDUCING FEATURES
One to Ten Dwellings Per Year
With radon reducing features
No radon reducing features
Eleven To Twenty-Five Dwellings Per Year
With radon reducing features
No radon reducing features
Twenty-Six To 100 Dwellings Per Year
With radon reducing features
No radon reducing features
Over 100 Dwellings Per Year
With radon reducing features
No radon reducing features
2.0%
23.9%
7.4%
0.0%
43.5%
0.0%
13.5%
10.1%
37.1%
0.0%
15.9%
25.7%
11.3%
0.0%
0.0%
6.5%
31.3%
3.3%
13.2%
14.4%
25.5%
0.0%
5.9%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 28
METHODS EMPLOYED TO REDUCE RADON
Dwellings With Basements
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - BASEMENTS
Dwellings With Crawl Spaces
Passive stack subslab ventilation
Fan-driven (active) ventilation
Foundation Wall Vents
None
SUBTOTAL - CRAWL SPACES
Dwellings With Slabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALING METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings With Basements
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
SEALING METHODS - SLABS
(Multiple Answers Possible)
Dwellings With Slabs
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
AL & MS
0.0%
1.9%
0.0%
3.0%
1.4%
6.2%
0.9%
0.0%
18.5%
16.9%
36.3%
0.0%
6.7%
0.0%
35.4%
15.5%
57.5%
100.0%
78.4%
21.6%
5.4%
0.0%
0.0%
0.0%
0.0%
21.6%
127.0%
71.9%
0.0%
7.0%
0.0%
0.0%
0.0%
0.0%
26.9%
105.9%
KY&TN
2.7%
17.2%
2.3%
7.8%
2.4%
32.4%
7.5%
0.3%
3.9%
27.3%
38.9%
0.7%
8.6%
0.0%
14.1%
5.3%
28.7%
100.0%
91.3%
6.5%
63.0%
5.4%
0.0%
58.6%
0.0%
8.7%
233.5%
66.9%
3.7%
28.4%
3.7%
0.0%
14.9%
0.0%
20.9%
138.3%
ESCEN
1.5%
10.4%
1.3%
5.7%
2.0%
20.9%
4.6%
0.1%
10.3%
22.7%
37.7%
0.4%
7.8%
0.0%
23.5%
9.8%
41.4%
100.0%
85.6%
13.2%
37.6%
3.0%
0.0%
32.8%
0.0%
14.4%
186.5%
69.1%
2.1%
18.9%
2.1%
0.0%
8.3%
0.0%
23.5%
124.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 29
SUBSLAB PREPARATION -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
42.6%
23.6%
34.9%
0.5%
0.0%
21.1%
63.9%
1.1%
4.0%
191.7%
82.7%
0.0%
5.8%
0.6%
33.3%
58.1%
86.2%
28.8%
2.1%
297.6%
65.0%
10.4%
18.6%
0.6%
18.6%
41.8%
76.4%
16.6%
2.9%
250.9%
SUBSLAB PREPARATION -- BASEMENTS
(Multiple Answers Possible)
Dwellings On Basements
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
89.2%
0.0%
10.8%
5.4%
0.0%
5.4%
59.4%
5.4%
29.8%
205.4%
96.7%
0.0%
1.1%
1.1%
21.8%
79.6%
92.4%
45.7%
3.3%
341.6%
93.4%
0.0%
5.4%
3.0%
12.2%
46.8%
77.8%
27.9%
15.0%
281.5%
SUBSLAB PREPARATION -- SLABS
(Multiple Answers Possible)
Dwellings On Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
37.5%
26.2%
37.5%
0.0%
0.0%
22.9%
64.4%
0.6%
1.2%
190.2%
66.9%
0.0%
11.0%
0.0%
46.4%
34.0%
79.2%
9.8%
0.7%
248.0%
53.9%
11.5%
22.7%
0.0%
25.9%
29.1%
72.6%
5.7%
0.9%
222.5%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 30
COST OF PASSIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
16.7%
10.0%
73.3%
0.0%
0.0%
0.0%
0.0%
100.0%
21
87.8%
7.3%
4.9%
0.0%
0.0%
0.0%
0.0%
100.0%
26
74.8%
7.8%
17.4%
0.0%
0.0%
0.0%
0.0%
100.0%
COST OF ACTIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
0
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
10
20.6%
58.8%
7.4%
0.0%
7.4%
5.9%
0.0%
100.0%
10
20.6%
58.8%
7.4%
0.0%
7.4%
5.9%
0.0%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 31
SAMPLE SIZE
Units
Builders
WGHTD AVERAGE UNITS PER BLDR
TYPE OF HOUSE: WITH RADON REDUCING FEATURES
One Story Dwellings With Basements
With radon reducing features
No radon reducing features
One story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
One Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Two Story Dwellings With Basements
With radon reducing features
No radon reducing features
Two Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Three Story Dwellings With Basements
With radon reducing features
No radon reducing features
Three Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATION -- EXCEPT PIERS
Basements
With radon reducing features
No radon reducing features
Crawl Spaces
With radon reducing features
No radon reducing features
Slabs on Grade
With radon reducing features
No radon reducing features
TOTAL
ALL DWELLINGS -- EXCEPT ON PIERS
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
AR & OK
386
46
8.4
0.0%
2.7%
0.0%
2.3%
5.7%
70.5%
0.0%
1.7%
0.0%
1.4%
4.1%
11.3%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.3%
100.0%
0.0%
4.4%
0.0%
3.8%
9.8%
82.0%
100.0%
9.8%
90.2%
100.0%
LA&ETX
449
41
10.9
0.0%
1.3%
0.0%
0.6%
0.0%
63.7%
0.0%
0.6%
0.0%
1.1%
0.0%
27.4%
0.0%
0.0%
0.0%
0.0%
0.0%
0.1%
5.2%
100.0%
0.0%
2.1%
0.0%
1.8%
0.0%
96.2%
100.0%
0.0%
100.0%
100.0%
WTX
497
71
7.0
0.0%
4.5%
0.0%
0.8%
1.0%
49.2%
0.2%
0.5%
0.0%
0.2%
0.2%
37.5%
0.0%
0.0%
0.0%
0.0%
0.0%
2.1%
3.9%
100.0%
0.2%
5.1%
0.0%
1.0%
1.2%
92.5%
100.0%
1.4%
98.6%
100.0%
W S CEN I
1332
158
8.8
0.0%
2.9%
0.0%
0.9%
1.1%
58.0%
0.1%
0.7%
0.0%
0.7%
0.6%
30.0%
0.0%
0.0%
0.0%
0.0%
0.0%
1.0%
4.0%
100.0%
0.1%
3.7%
0.0%
1.7%
1.7%
92.8%
100.0%
1.8%
98.2%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 32
TESTING OF DWELLINGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units With Basements
Tested For Radon Levels
Tested Units Needing More Work
Units With Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units With Slabs
Tested For Radon Levels
Tested Units Needing More Work
13.7%
0.0%
0.0%
0.0%
0.0%
0.0%
15.0%
0.0%
0.9%
0.0%
0.0%
0.0%
0.0%
0.0%
0.9%
0.0%
1.2%
0.0%
14.3%
0.0%
0.0%
0.0%
0.4%
0.0%
2.6%
0.0%
9.0%
0.0%
0.0%
0.0%
2.4%
0.0%
CONSTRUCTION METHOD
DWELLINGS WITH RADON REDUCING FEATURES
Conventional Constructed On Site
With radon reducing features
No radon reducing features
Prefabricated Units (Panelized)
With radon reducing features
No radon reducing features
Modular
With radon reducing features
No radon reducing features
ALL Dwellings
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
9.8%
90.2%
0.0%
0.0%
0.0%
0.0%
9.8%
90.2%
100.0%
0.0%
100.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
100.0%
1.4%
98.6%
0.0%
0.0%
0.0%
0.0%
1.4%
98.6%
100.0%
1.8%
98.2%
0.0%
0.0%
0.0%
0.0%
1.8%
98.2%
100.0%
SIZE OF BUILDER
DWELLINGS WITH RADON REDUCING FEATURES
One to Ten Dwellings Per Year
With radon reducing features
No radon reducing features
Eleven To Twenty-Five Dwellings Per Year
With radon reducing features
No radon reducing features
Twenty-Six To 100 Dwellings Per Year
With radon reducing features
No radon reducing features
Over 100 Dwellings Per Year
With radon reducing features
No radon reducing features
0.0%
24.1%
0.0%
24.9%
9.8%
16.8%
0.0%
24.4%
0.0%
23.6%
0.0%
8.0%
0.0%
29.6%
0.0%
38.7%
1.4%
33.9%
0.0%
11.6%
0.0%
19.9%
0.0%
33.2%
0.6%
28.3%
0.0%
11.7%
1.2%
23.7%
0.0%
34.5%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 33
METHODS EMPLOYED TO REDUCE RADON
Dwellings With Basements
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - BASEMENTS
Dwellings With Crawl Spaces
Passive stack subslab ventilation
Fan-driven (active) ventilation
Foundation Wall Vents
None
SUBTOTAL - CRAWL SPACES
Dwellings With Slabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALING METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings With Basements
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
SEALING METHODS - SLABS
(Multiple Answers Possible)
Dwellings With Slabs
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
AR & OK
0.0%
0.0%
0.0%
2.9%
1.6%
4.4%
0.0%
0.0%
1.4%
2.3%
3.8%
0.0%
9.8%
0.0%
42.3%
39.6%
91.8%
100.0%
64.7%
23.5%
5.9%
5.9%
5.9%
5.9%
0.0%
35.3%
147.1%
39.1%
15.0%
29.1%
10.7%
0.0%
0.0%
0.0%
43.2%
137.0%
LA&ETX
0.0%
0.0%
0.0%
2.0%
0.1%
2.1%
0.0%
0.0%
0.0%
1.8%
1.8%
0.0%
0.0%
0.0%
51.8%
44.3%
96.2%
100.0%
81.0%
0.0%
14.2%
0.0%
0.0%
0.0%
0.0%
4.8%
100.0%
53.2%
0.0%
1.9%
1.2%
0.0%
0.0%
0.0%
46.1%
102.3%
WTX
0.1%
0.2%
0.0%
4.8%
0.3%
5.3%
0.0%
0.0%
0.0%
1.0%
1.0%
0.1%
1.2%
0.0%
36.6%
55.7%
93.7%
100.0%
82.1%
11.3%
1.4%
0.0%
0.0%
0.0%
0.0%
6.6%
101.4%
25.8%
0.4%
15.8%
14.8%
0.0%
0.0%
0.0%
59.6%
116.4%
WSCEN
0.0%
0.1%
0.0%
3.3%
0.3%
3.8%
0.0%
0.0%
0.2%
1.5%
1.7%
0.1%
1.7%
0.0%
43.8%
48.9%
94.5%
100.0%
79.5%
8.0%
7.4%
0.7%
0.7%
0.7%
0.0%
9.3%
106.3%
39.0%
2.0%
11.5%
8.5%
0.0%
0.0%
0.0%
51.9%
112.9%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 34
SUBSLAB PREPARATION -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
25.7%
3.5%
84.8%
0.0%
29.5%
4.0%
49.4%
1.2%
10.0%
208.0%
7.4%
0.6%
93.2%
1.4%
0.0%
2.0%
70.3%
0.2%
3.2%
178.4%
30.8%
11.8%
41.4%
0.0%
0.0%
1.4%
58.9%
7.1%
16.0%
167.3%
20.2%
6.0%
68.7%
0.6%
3.6%
2.0%
62.6%
3.5%
9.8%
177.0%
SUBSLAB PREPARATION -- BASEMENTS
(Multiple Answers Possible)
Dwellings On Basements
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
64.7%
23.5%
58.8%
0.0%
47.1%
58.8%
88.2%
0.0%
17.7%
358.8%
0.0%
4.8%
81.0%
21.5%
0.0%
40.5%
40.5%
0.0%
100.0%
288.3%
12.7%
0.0%
90.6%
0.0%
0.0%
3.8%
12.7%
0.0%
20.7%
140.5%
13.6%
4.9%
82.7%
9.2%
5.7%
26.1%
33.7%
0.0%
54.1%
229.8%
SUBSLAB PREPARATION -- SLABS
(Multiple Answers Possible)
Dwellings On Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
23.8%
2.5%
86.1%
0.0%
28.6%
1.4%
47.5%
1.3%
9.6%
200.8%
7.6%
0.6%
93.5%
0.9%
0.0%
1.2%
71.0%
0.2%
1.2%
176.0%
31.8%
12.5%
38.6%
0.0%
0.0%
1.3%
61.5%
7.5%
15.7%
168.9%
20.5%
6.2%
67.7%
0.4%
3.5%
1.3%
63.9%
3.7%
8.8%
175.8%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 35
COST OF PASSIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
29.7%
17.6%
41.8%
0.0%
11.0%
0.0%
0.0%
100.0%
61.5%
0.0%
0.0%
0.0%
38.5%
0.0%
0.0%
100.0%
70.0%
8.0%
0.0%
0.0%
22.0%
0.0%
0.0%
100.0%
19
43.8%
14.2%
27.2%
0.0%
14.8%
0.0%
0.0%
100.0%
COST OF ACTIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
33.3%
0.0%
66.7%
0.0%
0.0%
0.0%
0.0%
100.0%
100.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
0
0.0%
0.0%
0.0%
23.9%
0.0%
0.0%
0.0%
23.9%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 36
SAMPLE SIZE
Units
Builders
WGHTD AVERAGE UNITS PER BLDR
TYPE OF HOUSE: WITH RADON REDUCING FEATURES
One Story Dwellings With Basements
With radon reducing features
No radon reducing features
One story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
One Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Two Story Dwellings With Basements
With radon reducing features
No radon reducing features
Two Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Three Story Dwellings With Basements
With radon reducing features
No radon reducing features
Three Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATION -- EXCEPT PIERS
Basements
With radon reducing features
No radon reducing features
Crawl Spaces
With radon reducing features
No radon reducing features
Slabs on Grade
With radon reducing features
No radon reducing features
TOTAL
ALL DWELLINGS -- EXCEPT ON PIERS
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
AZ & NM & NV
72
28
2.6
1.5%
1.9%
0.0%
7.1%
0.1%
46.3%
0.1%
6.8%
0.0%
6.9%
0.0%
27.7%
0.0%
0.0%
0.0%
1.4%
0.0%
0.0%
0.0%
100.0%
1.7%
8.7%
0.0%
15.5%
0.1%
74.1%
100.0%
1.8%
98.2%
100.0%
CO & UT
109
35
3.1
8.2%
17.8%
0.0%
6.4%
13.0%
1.8%
2.8%
23.5%
5.5%
11.0%
0.8%
0.9%
5.5%
1.8%
0.0%
0.9%
0.0%
0.0%
0.0%
100.0%
16.5%
43.1%
5.5%
18.4%
13.8%
2.8%
100.0%
35.8%
64.2%
100.0%
ID&MT&WY
55
29
1.9
6.7%
29.3%
12.5%
9.9%
4.5%
5.8%
2.7%
11.6%
3.4%
8.1%
1.9%
1.6%
0.0%
0.0%
0.0%
0.0%
0.0%
1.8%
0.2%
100.0%
9.4%
41.0%
15.9%
18.1%
6.4%
9.2%
100.0%
31.7%
68.3%
100.0%
MTN I
236
92
2.7
4.9%
12.1%
1.8%
7.3%
5.7%
23.2%
1.5%
14.0%
2.6%
8.7%
0.6%
13.5%
2.1%
0.7%
0.0%
1.0%
0.0%
0.3%
0.0%
100.0%
8.5%
26.7%
4.5%
17.0%
6.3%
37.0%
100.0%
19.3%
80.7%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 37
AZ & NM & NV
ID&MT&WY
TESTING OF DWELLINGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units With Basements
Tested For Radon Levels
Tested Units Needing More Work
Units With Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units With Slabs
Tested For Radon Levels
Tested Units Needing More Work
11.1%
0.0%
13.4%
0.0%
35.9%
0.0%
5.6%
0.0%
26.1%
6.0%
20.0%
7.3%
57.3%
3.4%
2.8%
50.0%
14.9%
18.8%
12.7%
8.3%
24.5%
26.2%
0.9%
54.4%
17.4%
5.8%
17.6%
6.7%
42.5%
5.5%
4.9%
4.6%
CONSTRUCTION METHOD
DWELLINGS WITH RADON REDUCING FEATURES
Conventional Constructed On Site
With radon reducing features
No radon reducing features
Prefabricated Units (Panelized)
With radon reducing features
No radon reducing features
Modular
With radon reducing features
No radon reducing features
ALL Dwellings
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
1.8%
98.2%
0.0%
0.0%
0.0%
0.0%
1.8%
98.2%
100.0%
35.8%
64.2%
0.0%
0.0%
0.0%
0.0%
35.8%
64.2%
100.0%
31.7%
68.3%
0.0%
0.0%
0.0%
0.0%
31.7%
68.3%
100.0%
19.3%
80.7%
0.0%
0.0%
0.0%
0.0%
19.3%
80.7%
100.0%
SIZE OF BUILDER
DWELLINGS WITH RADON REDUCING FEATURES
One to Ten Dwellings Per Year
With radon reducing features
No radon reducing features
Eleven To Twenty-Five Dwellings Per Year
With radon reducing features
No radon reducing features
Twenty-Six To 100 Dwellings Per Year
With radon reducing features
No radon reducing features
Over 100 Dwellings Per Year
With radon reducing features
No radon reducing features
1.8%
71.8%
0.0%
12.5%
0.0%
0.0%
0.0%
13.9%
21.1%
44.0%
0.0%
0.0%
14.7%
20.2%
0.0%
0.0%
22.3%
48.7%
0.0%
0.0%
9.4%
19.6%
0.0%
0.0%
12.3%
57.7%
0.0%
5.8%
7.0%
10.7%
0.0%
6.5%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 38
METHODS EMPLOYED TO REDUCE RADON
Dwellings With Basements
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - BASEMENTS
Dwellings With Crawl Spaces
Passive stack subslab ventilation
Fan-driven (active) ventilation
Foundation Wall Vents
None
SUBTOTAL - CRAWL SPACES
Dwellings With Slabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALING METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings With Basements
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
SEALING METHODS - SLABS
(Multiple Answers Possible)
Dwellings With Slabs
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
AZ & NM & NV
0.0%
1.4%
0.3%
2.5%
6.2%
10.3%
0.0%
0.0%
2.8%
12.7%
15.5%
0.0%
0.0%
0.1%
15.2%
58.9%
74.2%
100.0%
40.3%
0.0%
13.4%
13.4%
0.0%
0.0%
0.0%
59.7%
126.9%
7.5%
13.1%
7.5%
5.6%
3.8%
3.8%
0.0%
79.4%
120.6%
CO & UT
2.3%
8.8%
7.7%
4.6%
36.2%
59.6%
0.0%
5.5%
0.9%
17.4%
23.9%
0.9%
13.8%
0.0%
0.0%
1.8%
16.5%
100.0%
20.0%
9.2%
13.8%
4.6%
0.0%
12.3%
0.0%
64.7%
124.6%
5.6%
0.0%
83.4%
0.0%
0.0%
5.6%
0.0%
11.1%
105.6%
ID&MT&WY
10.1%
8.9%
0.5%
9.1%
21.8%
50.4%
10.9%
5.0%
0.2%
17.8%
34.0%
0.0%
6.4%
0.0%
1.8%
7.4%
15.6%
100.0%
3.6%
13.1%
10.8%
0.0%
0.0%
0.0%
0.0%
72.4%
100.0%
0.0%
40.9%
11.7%
0.0%
0.0%
0.0%
0.0%
47.4%
100.0%
MTN
2.4%
5.4%
3.2%
4.3%
20.1%
35.3%
1.6%
2.9%
1.7%
15.3%
21.4%
0.4%
6.3%
0.1%
7.3%
29.3%
43.3%
100.0%
27.1%
5.5%
13.2%
8.1%
0.0%
4.8%
0.0%
63.5%
122.1%
5.6%
12.1%
37.4%
2.6%
1.7%
3.9%
0.0%
48.3%
111.8%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 39
AZ & NM & NV
ID&MT&WY
SUBSLAB PREPARATION -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
88.5%
4.9%
14.8%
9.9%
14.8%
3.3%
14.5%
14.8%
7.3%
172.8%
88.0%
2.4%
19.3%
7.2%
43.4%
19.3%
51.8%
1.2%
8.4%
241.0%
81.9%
7.4%
14.7%
6.4%
59.3%
28.5%
23.0%
2.8%
13.5%
237.5%
87.3%
4.3%
16.5%
8.3%
32.4%
13.2%
30.2%
7.8%
8.6%
208.6%
SUBSLAB PREPARATION -- BASEMENTS
(Multiple Answers Possible)
Dwellings On Basements
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
73.1%
0.0%
0.0%
0.0%
53.8%
26.9%
46.3%
13.4%
59.7%
273.1%
84.6%
3.1%
1.5%
9.2%
29.2%
23.1%
43.1%
1.5%
10.7%
206.1%
78.2%
19.3%
8.4%
57.5%
33.7%
30.1%
0.0%
1.4%
238.2%
78.3%
2.6%
3.4%
4.8%
44.8%
26.4%
42.6%
6.9%
32.2%
242.1%
SUBSLAB PREPARATION -- SLABS
(Multiple Answers Possible)
Dwellings On Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
90.6%
5.6%
16.9%
11.2%
9.4%
0.0%
10.1%
15.0%
0.0%
158.8%
100.0%
0.0%
83.4%
0.0%
94.5%
5.6%
83.4%
0.0%
0.0%
366.7%
94.1%
0.0%
0.0%
0.0%
64.9%
11.7%
0.0%
11.7%
52.7%
235.0%
94.8%
2.6%
40.1%
5.2%
50.4%
3.9%
36.9%
8.7%
7.8%
250.3%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 40
AZ & NM & NV
ID&MT&WY
COST OF PASSIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
80.0%
0.0%
0.0%
0.0%
0.0%
20.0%
0.0%
100.0%
13
18.4%
2.0%
32.7%
0.0%
0.0%
4.1%
42.9%
100.0%
31.3%
25.0%
37.5%
6.3%
0.0%
0.0%
0.0%
100.0%
25
25.2%
8.6%
32.5%
1.8%
0.0%
3.7%
28.2%
100.0%
COST OF ACTIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
0.0%
0.0%
80.0%
0.0%
0.0%
20.0%
0.0%
100.0%
3.9%
0.0%
0.0%
15.4%
0.0%
50.0%
30.8%
100.0%
14.3%
0.0%
28.6%
0.0%
0.0%
0.0%
57.1%
100.0%
14
5.1%
0.0%
6.3%
12.9%
0.0%
42.4%
33.3%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 41
SAMPLE SIZE
Units
Builders
WGHTD AVERAGE UNITS PER BLDR
TYPE OF HOUSE: WITH RADON REDUCING FEATURES
One Story Dwellings With Basements
With radon reducing features
No radon reducing features
One story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
One Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Two Story Dwellings With Basements
With radon reducing features
No radon reducing features
Two Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Three Story Dwellings With Basements
With radon reducing features
No radon reducing features
Three Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATION -- EXCEPT PIERS
Basements
With radon reducing features
No radon reducing features
Crawl Spaces
With radon reducing features
No radon reducing features
Slabs on Grade
With radon reducing features
No radon reducing features
TOTAL
ALL DWELLINGS -- EXCEPT ON PIERS
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
NCA
163
25
6.5
0.0%
2.1%
0.0%
5.1%
0.0%
61.5%
0.0%
0.5%
0.0%
7.5%
0.0%
21.5%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
1.8%
100.0%
0.0%
2.7%
0.0%
12.9%
0.0%
84.4%
100.0%
0.0%
100.0%
100.0%
S CA & HI
88
25
3.5
0.0%
2.5%
0.0%
4.6%
0.0%
39.6%
0.0%
5.3%
0.2%
3.5%
0.0%
37.1%
0.0%
2.1%
0.0%
0.3%
0.0%
0.9%
3.7%
100.0%
0.0%
10.4%
0.2%
8.8%
0.0%
80.7%
100.0%
0.2%
99.8%
100.0%
OR
84
34
2.5
0.6%
5.9%
5.4%
43.7%
0.0%
4.4%
0.0%
3.0%
3.0%
30.1%
0.0%
4.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
0.6%
8.9%
8.3%
73.8%
0.0%
8.3%
100.0%
8.9%
91.1%
100.0%
WA&AK
152
51
3.0
4.4%
6.8%
3.3%
17.6%
3.5%
2.5%
4.2%
17.1%
1.9%
30.7%
1.8%
1.6%
0.0%
4.6%
0.0%
0.0%
0.0%
0.0%
0.1%
100.0%
8.6%
28.5%
5.2%
48.3%
5.3%
4.1%
100.0%
19.1%
80.9%
100.0%
PAC I
487
135
3.9
1.5%
4.2%
1.6%
13.3%
1.1%
29.0%
1.4%
7.7%
1.0%
16.3%
0.6%
18.1%
0.0%
2.2%
0.0%
0.1%
0.0%
0.3%
1.7%
100.0%
2.9%
14.2%
2.7%
29.8%
1.7%
48.7%
100.0%
7.2%
92.8%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 42
TESTING OF DWELLINGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units With Basements
Tested For Radon Levels
Tested Units Needing More Work
Units With Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units With Slabs
Tested For Radon Levels
Tested Units Needing More Work
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
7.4%
0.0%
32.9%
0.0%
14.7%
0.0%
3.3%
0.0%
10.4%
0.0%
0.0%
0.0%
12.6%
0.0%
0.0%
0.0%
2.6%
0.0%
1.3%
0.0%
3.7%
0.0%
2.1%
0.0%
4.4%
0.0%
7.1%
0.0%
6.8%
0.0%
1.8%
0.0%
CONSTRUCTION METHOD
DWELLINGS WITH RADON REDUCING FEATURES
Conventional Constructed On Site
With radon reducing features
No radon reducing features
Prefabricated Units (Panelized)
With radon reducing features
No radon reducing features
Modular
With radon reducing features
No radon reducing features
ALL Dwellings
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
0.0%
100.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
100.0%
0.2%
99.8%
0.0%
0.0%
0.0%
0.0%
0.2%
99.8%
100.0%
8.9%
91.1%
0.0%
0.0%
0.0%
0.0%
8.9%
91.1%
100.0%
19.1%
80.9%
0.0%
0.0%
0.0%
0.0%
19.1%
80.9%
100.0%
7.2%
92.8%
0.0%
0.0%
0.0%
0.0%
7.2%
92.8%
100.0%
SIZE OF BUILDER
DWELLINGS WITH RADON REDUCING FEATURES
One to Ten Dwellings Per Year
With radon reducing features
No radon reducing features
Eleven To Twenty-Five Dwellings Per Year
With radon reducing features
No radon reducing features
Twenty-Six To 100 Dwellings Per Year
With radon reducing features
No radon reducing features
Over 100 Dwellings Per Year
With radon reducing features
No radon reducing features
0.0%
20.9%
0.0%
8.6%
0.0%
54.0%
0.0%
16.6%
0.2%
56.4%
0.0%
0.0%
0.0%
43.4%
0.0%
0.0%
8.9%
91.1%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
5.9%
65.8%
0.0%
7.2%
0.0%
7.9%
13.2%
0.0%
3.0%
54.7%
0.0%
4.4%
0.0%
29.6%
4.3%
4.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 43
METHODS EMPLOYED TO REDUCE RADON
Dwellings With Basements
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - BASEMENTS
Dwellings With Crawl Spaces
Passive stack subslab ventilation
Fan-driven (active) ventilation
Foundation Wall Vents
None
SUBTOTAL - CRAWL SPACES
Dwellings With Slabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALING METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings With Basements
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
SEALING METHODS - SLABS
(Multiple Answers Possible)
Dwellings With Slabs
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
NCA
0.0%
0.0%
0.0%
0.6%
2.1%
2.7%
0.0%
0.0%
3.1%
9.8%
12.9%
0.0%
0.0%
0.0%
45.6%
38.9%
84.4%
100.0%
22.9%
22.9%
0.0%
0.0%
0.0%
0.0%
0.0%
77.1%
122.9%
34.3%
19.6%
23.3%
0.0%
0.0%
0.0%
0.0%
46.1%
123.3%
S CA & HI
3.0%
0.0%
0.0%
2.3%
5.1%
10.4%
0.2%
0.0%
4.6%
4.2%
9.0%
2.7%
0.0%
0.0%
19.2%
58.8%
80.7%
100.0%
51.2%
11.0%
11.0%
29.2%
0.0%
0.0%
0.0%
48.8%
151.2%
27.2%
2.6%
2.6%
3.3%
0.0%
0.0%
0.0%
72.9%
108.5%
OR
0.0%
0.0%
0.6%
3.6%
5.4%
9.5%
3.6%
4.8%
28.6%
45.2%
82.1%
1.2%
0.0%
0.0%
3.6%
3.6%
8.3%
100.0%
37.5%
18.8%
0.0%
0.0%
0.0%
0.0%
0.0%
56.3%
112.5%
28.6%
0.0%
57.1%
0.0%
0.0%
0.0%
0.0%
42.9%
128.6%
WA&AK
0.0%
1.7%
6.9%
22.6%
5.9%
37.1%
3.4%
1.8%
9.9%
38.5%
53.5%
0.0%
1.4%
3.8%
1.4%
2.6%
9.3%
100.0%
67.2%
5.3%
41.7%
0.0%
0.0%
0.0%
0.0%
16.0%
130.1%
30.6%
0.0%
41.2%
0.0%
0.0%
0.0%
0.0%
28.2%
100.0%
PAC
1.0%
0.5%
2.3%
8.6%
4.6%
17.1%
1.6%
1.1%
8.6%
21.2%
32.5%
1.0%
0.5%
1.2%
18.1%
29.6%
50.4%
100.0%
48.0%
12.9%
17.1%
9.4%
0.0%
0.0%
0.0%
45.8%
133.2%
30.2%
5.6%
26.2%
1.1%
0.0%
0.0%
0.0%
48.5%
111.5%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 44
SUBSLAB PREPARATION -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
33.6%
28.4%
97.2%
0.8%
0.7%
2.5%
99.3%
4.1%
1.5%
268.0%
22.4%
3.8%
91.6%
1.3%
2.9%
9.4%
53.7%
0.0%
6.6%
191.6%
66.7%
0.0%
33.3%
6.7%
53.3%
33.3%
33.3%
26.7%
33.3%
286.7%
92.6%
4.6%
18.0%
2.8%
91.5%
30.8%
52.7%
0.0%
5.0%
298.0%
52.8%
9.6%
62.6%
2.2%
36.7%
17.3%
62.2%
3.9%
7.8%
255.2%
SUBSLAB PREPARATION -- BASEMENTS
(Multiple Answers Possible)
Dwellings On Basements
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
85.4%
14.6%
62.2%
22.9%
22.9%
47.9%
100.0%
77.1%
47.9%
481.0%
51.2%
0.0%
84.3%
11.0%
22.0%
29.2%
51.2%
0.0%
15.7%
264.7%
37.5%
0.0%
0.0%
12.5%
50.0%
37.5%
37.5%
12.5%
62.5%
250.0%
93.5%
3.0%
13.4%
3.6%
89.4%
34.7%
53.0%
0.0%
6.3%
296.7%
71.7%
4.5%
46.6%
11.6%
47.2%
36.4%
62.1%
20.1%
25.6%
325.9%
SUBSLAB PREPARATION -- SLABS
(Multiple Answers Possible)
Dwellings On Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
32.0%
28.8%
98.3%
0.0%
0.0%
1.1%
99.3%
1.8%
0.0%
261.2%
18.7%
4.3%
92.5%
0.0%
0.5%
6.9%
54.0%
0.0%
5.4%
182.2%
100.0%
0.0%
71.4%
0.0%
57.1%
28.6%
28.6%
42.9%
0.0%
328.6%
11.2%
36.5%
0.0%
100.0%
15.3%
51.8%
0.0%
0.0%
303.5%
53.7%
12.0%
73.4%
0.0%
39.0%
10.6%
61.4%
5.2%
1.7%
256.9%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 45
COST OF PASSIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
0
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
43.5%
13.0%
13.0%
26.1%
4.4%
0.0%
0.0%
100.0%
40.0%
0.0%
20.0%
20.0%
20.0%
0.0%
0.0%
100.0%
11
53.7%
5.6%
33.3%
5.6%
0.0%
1.9%
0.0%
100.0%
25
51.4%
4.9%
30.8%
8.3%
3.2%
1.5%
0.0%
100.0%
COST OF ACTIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
0
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
77.8%
0.0%
0.0%
22.2%
0.0%
0.0%
0.0%
100.0%
10.3%
69.0%
0.0%
10.3%
0.0%
10.3%
0.0%
100.0%
10
10.3%
69.0%
0.0%
10.3%
0.0%
10.3%
0.0%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 46
SAMPLE SIZE
Units
Builders
WGHTD AVERAGE UNITS PER BLDR
NEW ENG
186
81
2.3
MID ATL
354
121
2.9
ENCEN
871
199
4.4
W N CEN
753
171
4.7
SATL
1294
261
4.7
ESCEN
581
98
5.9
W S CEN
1332
158
8.8
MTN
236
92
2.7
PAC
487
135
3.9
US TOTAL I
6092
1316
5.2
TYPE OF HOUSE: WITH RADON REDUCING FEATURES
One Story Dwellings With Basements
With radon reducing features
No radon reducing features
One story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
One Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Two Story Dwellings With Basements
With radon reducing features
No radon reducing features
Two Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Three Story Dwellings With Basements
With radon reducing features
No radon reducing features
Three Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATION -- EXCEPT PIERS
Basements
With radon reducing features
No radon reducing features
Crawl Spaces
With radon reducing features
No radon reducing features
Slabs on Grade
With radon reducing features
No radon reducing features
TOTAL
ALL DWELLINGS -- EXCEPT ON PIERS
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
7.8%
29.2%
0.0%
0.4%
2.8%
2.1%
11.3%
42.3%
0.0%
0.1%
0.7%
0.9%
0.0%
1.9%
0.0%
0.0%
0.0%
0.0%
0.5%
100.0%
19.2%
73.7%
0.0%
0.4%
3.6%
3.0%
100.0%
22.8%
77.2%
100.0%
6.1%
29.0%
0.0%
1.3%
0.3%
1.8%
16.9%
37.5%
0.0%
2.1%
0.1%
3.5%
0.0%
0.2%
0.0%
0.7%
0.0%
0.0%
0.6%
100.0%
23.1%
67.2%
0.0%
4.1%
0.4%
5.3%
100.0%
23.5%
76.5%
100.0%
12.1%
35.5%
3.9%
3.7%
0.3%
6.0%
9.3%
24.4%
0.6%
2.8%
0.1%
0.6%
0.1%
0.3%
0.0%
0.0%
0.0%
0.0%
0.3%
100.0%
21.5%
60.3%
4.6%
6.5%
0.5%
6.6%
100.0%
26.5%
73.5%
100.0%
23.8%
40.4%
0.0%
3.0%
0.9%
1.5%
14.4%
13.8%
0.0%
0.3%
0.8%
0.2%
0.4%
0.0%
0.0%
0.0%
0.0%
0.0%
0.5%
100.0%
38.7%
54.6%
0.0%
3.4%
1.7%
1.7%
100.0%
40.4%
59.6%
100.0%
1.0%
8.1%
0.7%
8.5%
2.2%
25.6%
9.5%
11.4%
1.3%
9.5%
0.4%
17.7%
0.7%
1.2%
0.0%
0.2%
0.0%
0.2%
1.6%
100.0%
11.3%
20.8%
2.0%
18.4%
2.7%
44.8%
100.0%
16.1%
83.9%
100.0%
5.5%
5.6%
1.6%
25.0%
4.2%
25.3%
6.0%
3.5%
3.1%
7.8%
3.5%
7.8%
0.2%
0.0%
0.0%
0.0%
0.0%
0.1%
0.8%
100.0%
11.7%
9.1%
4.7%
33.1%
7.8%
33.7%
100.0%
24.2%
75.8%
100.0%
0.0%
2.9%
0.0%
0.9%
1.1%
58.0%
0.1%
0.7%
0.0%
0.7%
0.6%
30.0%
0.0%
0.0%
0.0%
0.0%
0.0%
1.0%
4.0%
100.0%
0.1%
3.7%
0.0%
1.7%
1.7%
92.8%
100.0%
1.8%
98.2%
100.0%
4.9%
12.1%
1.8%
7.3%
5.7%
23.2%
1.5%
14.0%
2.6%
8.7%
0.6%
13.5%
2.1%
0.7%
0.0%
1.0%
0.0%
0.3%
0.0%
100.0%
8.5%
26.7%
4.5%
17.0%
6.3%
37.0%
100.0%
19.3%
80.7%
100.0%
1.5%
4.2%
1.6%
13.3%
1.1%
29.0%
1.4%
7.7%
1.0%
16.3%
0.6%
18.1%
0.0%
2.2%
0.0%
0.1%
0.0%
0.3%
1.7%
100.0%
2.9%
14.2%
2.7%
29.8%
1.7%
48.7%
100.0%
7.2%
92.8%
100.0%
4.8%
13.8%
1.0%
6.9%
2.0%
26.6%
6.6%
12.4%
1.0%
6.2%
0.7%
14.9%
0.4%
0.7%
0.0%
0.2%
0.0%
0.3%
1.6%
100.0%
11.9%
27.0%
2.0%
13.4%
2.7%
43.0%
100.0%
16.6%
83.4%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 47
TESTING OF DWELLINGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units With Basements
Tested For Radon Levels
Tested Units Needing More Work
Units With Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units With Slabs
Tested For Radon Levels
Tested Units Needing More Work
NEW ENG
40.7%
12.9%
40.8%
13.8%
31.4%
0.0%
39.4%
0.0%
MID ATL
24.9%
16.0%
24.2%
18.3%
72.7%
0.0%
3.4%
5.0%
ENCEN
21.5%
26.2%
22.6%
30.0%
25.1%
0.7%
3.1%
26.8%
W N CEN
25.0%
26.1%
25.5%
27.5%
10.4%
0.5%
27.8%
1.2%
SATL
7.7%
9.3%
11.8%
9.9%
5.4%
8.3%
5.9%
8.8%
ESCEN
3.7%
8.6%
6.8%
10.0%
3.7%
11.5%
2.1%
1.4%
W S CEN
2.6%
0.0%
9.0%
0.0%
0.0%
0.0%
2.4%
0.0%
MTN
17.4%
5.8%
17.6%
6.7%
42.5%
5.5%
4.9%
4.6%
PAC
4.4%
0.0%
7.1%
0.0%
6.8%
0.0%
1.8%
0.0%
US TOTAL
11.5%
15.0%
20.1%
20.0%
12.8%
4.3%
3.8%
4.8%
CONSTRUCTION METHOD
DWELLINGS WITH RADON REDUCING FEATURES
Conventional Constructed On Site
With radon reducing features
No radon reducing features
Prefabricated Units (Panelized)
With radon reducing features
No radon reducing features
Modular
With radon reducing features
No radon reducing features
ALL Dwellings
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
22.8%
77.2%
0.0%
0.0%
0.0%
0.0%
23.5%
76.5%
0.0%
0.0%
0.0%
0.0%
26.5%
73.5%
0.0%
0.0%
0.0%
0.0%
40.4%
59.6%
0.0%
0.0%
0.0%
0.0%
16.1%
83.9%
0.0%
0.0%
0.0%
0.0%
24.2%
75.8%
0.0%
0.0%
0.0%
0.0%
1.8%
98.2%
0.0%
0.0%
0.0%
0.0%
19.3%
80.7%
0.0%
0.0%
0.0%
0.0%
7.2%
92.8%
0.0%
0.0%
0.0%
0.0%
16.6%
83.4%
0.0%
0.0%
0.0%
0.0%
22.8%
77.2%
100.0%
23.5%
76.5%
100.0%
26.5%
73.5%
100.0%
40.4%
59.6%
100.0%
16.1%
83.9%
100.0%
24.2%
75.8%
100.0%
1.8%
98.2%
100.0%
19.3%
80.7%
100.0%
7.2%
92.8%
100.0%
16.6%
83.4%
100.0%
SIZE OF BUILDER
DWELLINGS WITH RADON REDUCING FEATURES
One to Ten Dwellings Per Year
With radon reducing features 22.8% 23.1% 13.2% 22.5% 9.0% 6.5% 0.6% 12.3% 3.0% 9.4%
No radon reducing features 56.1% 53.2% 43.9% 38.4% 40.8% 31.3% 28.3% 57.7% 54.7% 41.9%
Eleven To Twenty-Five Dwellings Per Year
With radon reducing features 0.0% 0.0% 10.4% 6.2% 1.4% 3.3% 0.0% 0.0% 0.0% 2.1%
No radon reducing features 8.8% 16.7% 6.8% 9.6% 15.5% 13.2% 11.7% 5.8% 4.4% 11.1%
Twenty-Six To 100 Dwellings Per Year
With radon reducing features 0.0% 0.4% 2.3% 8.3% 3.2% 14.4% 1.2% 7.0% 0.0% 3.6%
No radon reducing features 12.2% 3.0% 17.1% 11.6% 14.1% 25.5% 23.7% 10.7% 29.6% 17.5%
Over 100 Dwellings Per Year
With radon reducing features 0.0% 0.0% 0.6% 3.4% 2.5% 0.0% 0.0% 0.0% 4.3% 1.4%
No radon reducing features 0.0% 3.7% 5.7% 0.0% 13.5% 5.9% 34.5% 6.5% 4.0% 12.9%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 48
METHODS EMPLOYED TO REDUCE RADON
Dwellings With Basements
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - BASEMENTS
Dwellings With Crawl Spaces
Passive stack subslab ventilation
Fan-driven (active) ventilation
Foundation Wall Vents
None
SUBTOTAL - CRAWL SPACES
Dwellings With Slabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALING METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings With Basements
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
SEALING METHODS - SLABS
(Multiple Answers Possible)
Dwellings With Slabs
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
NEW ENG
39.7%
13.2%
6.0%
5.3%
28.7%
93.0%
0.0%
0.0%
0.0%
0.4%
0.4%
0.0%
2.3%
1.3%
0.0%
3.0%
6.6%
100.0%
25.8%
9.4%
13.2%
6.7%
1.0%
7.8%
3.5%
58.8%
126.4%
35.3%
9.0%
19.6%
9.0%
0.0%
0.0%
0.0%
64.7%
137.6%
MID ATL
24.2%
19.7%
3.4%
20.0%
23.0%
90.3%
0.0%
0.0%
0.7%
3.4%
4.1%
0.0%
0.4%
0.0%
1.7%
3.6%
5.7%
100.0%
58.9%
8.4%
18.7%
3.8%
2.2%
20.2%
0.0%
36.5%
148.8%
56.6%
23.5%
23.5%
0.0%
0.0%
0.0%
0.0%
43.4%
147.0%
ENCEN
16.3%
17.1%
4.3%
20.4%
23.6%
81.8%
4.6%
0.0%
1.7%
4.9%
11.1%
0.5%
0.4%
0.0%
3.4%
2.8%
7.1%
100.0%
51.9%
12.6%
25.3%
11.5%
1.1%
27.4%
0.0%
36.5%
166.4%
58.9%
23.2%
6.8%
0.8%
0.0%
32.0%
0.0%
32.8%
154.5%
W N CEN
20.3%
35.0%
3.7%
15.1%
19.2%
93.3%
0.0%
0.0%
0.0%
3.4%
3.4%
0.4%
1.7%
0.0%
1.0%
0.3%
3.3%
100.0%
57.5%
18.1%
20.4%
11.4%
0.6%
25.8%
0.2%
31.2%
165.2%
42.4%
8.4%
22.1%
4.6%
3.5%
19.5%
0.0%
7.5%
108.0%
SATL
6.2%
10.0%
1.3%
8.5%
6.1%
32.1%
2.0%
0.0%
2.2%
16.1%
20.4%
0.5%
2.5%
0.3%
27.1%
17.2%
47.5%
100.0%
50.9%
3.3%
14.3%
12.5%
1.4%
10.2%
0.0%
40.3%
132.9%
56.1%
6.3%
6.3%
3.1%
0.3%
0.0%
0.0%
36.9%
109.0%
ESCEN
1.5%
10.4%
1.3%
5.7%
2.0%
20.9%
4.6%
0.1%
10.3%
22.7%
37.7%
0.4%
7.8%
0.0%
23.5%
9.8%
41.4%
100.0%
85.6%
13.2%
37.6%
3.0%
0.0%
32.8%
0.0%
14.4%
186.5%
69.1%
2.1%
18.9%
2.1%
0.0%
8.3%
0.0%
23.5%
124.0%
W S CEN
0.0%
0.1%
0.0%
3.3%
0.3%
3.8%
0.0%
0.0%
0.2%
1.5%
1.7%
0.1%
1.7%
0.0%
43.8%
48.9%
94.5%
100.0%
79.5%
8.0%
7.4%
0.7%
0.7%
0.7%
0.0%
9.3%
106.3%
39.0%
2.0%
11.5%
8.5%
0.0%
0.0%
0.0%
51.9%
112.9%
MTN
2.4%
5.4%
3.2%
4.3%
20.1%
35.3%
1.6%
2.9%
1.7%
15.3%
21.4%
0.4%
6.3%
0.1%
7.3%
29.3%
43.3%
100.0%
27.1%
5.5%
13.2%
8.1%
0.0%
4.8%
0.0%
63.5%
122.1%
5.6%
12.1%
37.4%
2.6%
1.7%
3.9%
0.0%
48.3%
111.8%
PAC
1.0%
0.5%
2.3%
8.6%
4.6%
17.1%
1.6%
1.1%
8.6%
21.2%
32.5%
1.0%
0.5%
1.2%
18.1%
29.6%
50.4%
100.0%
48.0%
12.9%
17.1%
9.4%
0.0%
0.0%
0.0%
45.8%
133.2%
30.2%
5.6%
26.2%
1.1%
0.0%
0.0%
0.0%
48.5%
111.5%
US TOTAL
7.7%
9.8%
2.1%
9.1%
10.1%
38.9%
1.6%
0.4%
2.6%
10.8%
15.4%
0.4%
2.4%
0.2%
20.9%
21.8%
45.7%
100.0%
57.0%
8.7%
16.5%
7.8%
0.8%
11.6%
0.1%
34.1%
136.7%
44.7%
8.5%
15.9%
3.7%
0.5%
5.6%
0.0%
39.9%
118.8%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 49
SUBSLAB PREPARATION -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
77.4%
2.5%
17.7%
8.8%
30.7%
32.5%
41.2%
0.7%
22.5%
233.9%
85.1%
6.2%
2.5%
0.6%
32.9%
51.3%
73.4%
4.1%
8.4%
264.5%
77.0%
7.9%
17.4%
4.0%
32.6%
39.2%
64.5%
1.7%
11.4%
255.8%
85.4%
3.7%
18.3%
2.1%
23.2%
54.9%
75.4%
7.2%
10.0%
280.1%
47.7%
5.4%
37.3%
1.5%
24.2%
22.9%
80.2%
6.9%
5.7%
231.8%
65.0%
10.4%
18.6%
0.6%
18.6%
41.8%
76.4%
16.6%
2.9%
250.9%
20.2%
6.0%
68.7%
0.6%
3.6%
2.0%
62.6%
3.5%
9.8%
177.0%
87.3%
4.3%
16.5%
8.3%
32.4%
13.2%
30.2%
7.8%
8.6%
208.6%
52.8%
9.6%
62.6%
2.2%
36.7%
17.3%
62.2%
3.9%
7.8%
255.2%
56.3%
6.3%
37.1%
2.4%
23.1%
24.4%
66.3%
5.8%
8.4%
230.1%
SUBSLAB PREPARATION -- BASEMENTS
(Multiple Answers Possible)
Dwellings On Basements
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
75.3%
2.5%
16.1%
6.2%
28.6%
30.6%
40.0%
0.8%
22.9%
223.1%
86.4%
5.7%
2.6%
0.6%
32.2%
53.3%
74.1%
4.6%
7.6%
267.2%
76.4%
8.1%
15.3%
4.4%
28.5%
38.8%
62.9%
2.0%
12.4%
248.9%
85.3%
3.8%
18.7%
2.0%
22.7%
54.6%
75.1%
7.1%
10.2%
279.6%
63.6%
8.4%
13.6%
2.1%
22.9%
20.8%
77.9%
8.8%
30.0%
248.1%
93.4%
0.0%
5.4%
3.0%
12.2%
46.8%
77.8%
27.9%
15.0%
281.5%
13.6%
4.9%
82.7%
9.2%
5.7%
26.1%
33.7%
0.0%
54.1%
229.8%
78.3%
2.6%
3.4%
4.8%
44.8%
26.4%
42.6%
6.9%
32.2%
242.1%
71.7%
4.5%
46.6%
11.6%
47.2%
36.4%
62.1%
20.1%
25.6%
325.9%
62.2%
5.4%
29.6%
5.1%
24.5%
32.4%
60.9%
8.1%
28.9%
257.2%
SUBSLAB PREPARATION -- SLABS
(Multiple Answers Possible)
Dwellings On Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
100.0%
0.0%
21.1%
42.9%
53.4%
57.1%
35.3%
0.0%
32.3%
342.1%
70.6%
19.9%
0.0%
0.0%
52.6%
26.8%
79.8%
0.0%
9.5%
259.2%
64.6%
11.4%
33.8%
0.0%
68.4%
63.3%
72.8%
0.0%
32.3%
346.5%
64.9%
0.0%
9.9%
2.0%
26.7%
37.3%
54.5%
7.9%
2.7%
205.8%
35.4%
0.6%
53.4%
0.5%
29.8%
14.3%
87.0%
3.4%
3.9%
228.3%
53.9%
11.5%
22.7%
0.0%
25.9%
29.1%
72.6%
5.7%
0.9%
222.5%
20.5%
6.2%
67.7%
0.4%
3.5%
1.3%
63.9%
3.7%
8.8%
175.8%
94.8%
2.6%
40.1%
5.2%
50.4%
3.9%
36.9%
8.7%
7.8%
250.3%
53.7%
12.0%
73.4%
0.0%
39.0%
10.6%
61.4%
5.2%
1.7%
256.9%
50.1%
6.1%
45.7%
2.0%
32.6%
19.7%
68.1%
4.0%
8.6%
237.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES -2011 DATA
PAGE 50
COST OF PASSIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
NEW ENG
39
15.3%
22.9%
9.5%
16.7%
29.3%
0.0%
6.2%
100.0%
MID ATL
47
20.6%
38.3%
23.0%
10.2%
3.3%
0.9%
3.8%
100.0%
ENCEN
80
33.1%
32.1%
16.1%
12.0%
1.2%
1.3%
4.2%
100.0%
W N CEN
92
26.3%
34.6%
12.3%
7.3%
12.6%
1.6%
5.3%
100.0%
SATL
70
37.9%
27.3%
15.4%
4.0%
12.5%
1.1%
1.7%
100.0%
ESCEN
26
74.8%
7.8%
17.4%
0.0%
0.0%
0.0%
0.0%
100.0%
W S CEN
19
43.8%
14.2%
27.2%
0.0%
14.8%
0.0%
0.0%
100.0%
MTN
25
25.2%
8.6%
32.5%
1.8%
0.0%
3.7%
28.2%
100.0%
PAC
25
51.4%
4.9%
30.8%
8.3%
3.2%
1.5%
0.0%
100.0%
US TOTAL
423
36.2%
25.6%
17.8%
6.1%
7.8%
1.3%
5.3%
100.0%
COST OF ACTIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
12
0.0%
4.1%
42.6%
0.0%
27.0%
4.1%
22.3%
100.0%
22
24.3%
44.5%
12.9%
2.7%
0.0%
13.5%
2.1%
100.0%
35
18.2%
7.9%
9.7%
19.2%
27.5%
15.5%
1.9%
100.0%
40
21.8%
18.1%
9.6%
7.2%
4.6%
23.8%
15.0%
100.0%
29
43.4%
7.7%
15.2%
10.2%
0.0%
0.2%
23.5%
100.0%
10
20.6%
58.8%
7.4%
0.0%
7.4%
5.9%
0.0%
100.0%
5
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
14
5.1%
0.0%
6.3%
12.9%
0.0%
42.4%
33.3%
100.0%
10
10.3%
69.0%
0.0%
10.3%
0.0%
10.3%
0.0%
100.0%
177
17.6%
21.6%
10.9%
10.2%
7.2%
17.6%
14.8%
100.0%
APPENDIX C
-------
APPENDIX D
SINGLE-FAMILY DETACHED
USAGE COEFFICIENT TABLES
BY THE THREE RADON EXPOSURE ZONES
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2011 DATA
PAGE1
SAMPLE SIZE
Units
Builders
WGHTD AVERAGE UNITS PER BLDR
TYPE OF HOUSE: WITH RADON REDUCING FEATURES
One Story Dwellings With Basements
With radon reducing features
No radon reducing features
One story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
One Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Two Story Dwellings With Basements
With radon reducing features
No radon reducing features
Two Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Three Story Dwellings With Basements
With radon reducing features
No radon reducing features
Three Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATION -- EXCEPT PIERS
Basements
With radon reducing features
No radon reducing features
Crawl Spaces
With radon reducing features
No radon reducing features
Slabs on Grade
With radon reducing features
No radon reducing features
TOTAL
ALL DWELLINGS -- EXCEPT ON PIERS
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
ZONE 1
1893
449
4.2
12.8%
29.9%
2.4%
6.3%
2.3%
3.1%
16.8%
18.0%
1.7%
2.7%
1.6%
1.5%
0.4%
0.2%
0.0%
0.0%
0.0%
0.0%
0.2%
100.0%
30.1%
48.2%
4.1%
9.0%
3.9%
4.6%
100.0%
38.2%
61.9%
100.0%
ZONE 2
1977
443
4.5
8.0%
18.9%
0.5%
6.6%
1.4%
19.4%
10.7%
18.7%
0.2%
5.6%
0.2%
7.5%
0.7%
0.7%
0.0%
0.2%
0.0%
0.1%
0.7%
100.0%
19.5%
38.5%
0.7%
12.5%
1.7%
27.2%
100.0%
21.8%
78.2%
100.0%
ZONE 3
2222
424
5.2
0.1%
3.6%
0.3%
7.0%
1.5%
48.6%
0.7%
4.6%
0.3%
5.1%
0.8%
23.0%
0.0%
0.6%
0.0%
0.2%
0.0%
0.6%
2.9%
100.0%
0.8%
9.1%
0.7%
12.7%
2.4%
74.4%
100.0%
3.9%
96.2%
100.0%
US TOTAL
6092
1316
5.2
4.8%
13.8%
1.0%
6.9%
2.0%
26.6%
6.6%
12.4%
1.0%
6.2%
0.7%
14.9%
0.4%
0.7%
0.0%
0.2%
0.0%
0.3%
1.6%
100.0%
11.9%
27.0%
2.0%
13.4%
2.7%
43.0%
100.0%
16.6%
83.4%
100.0%
APPENDIX D
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2011 DATA
PAGE 2
TESTING OF DWELLINGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units With Basements
Tested For Radon Levels
Tested Units Needing More Work
Units With Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units With Slabs
Tested For Radon Levels
Tested Units Needing More Work
21.6%
23.9%
23.3%
27.5%
18.0%
4.9%
11.9%
4.2%
13.8%
15.6%
19.9%
17.3%
9.7%
3.3%
3.2%
11.2%
4.8%
5.1%
9.1%
25.7%
4.7%
2.4%
4.3%
0.0%
11.5%
15.0%
20.1%
20.0%
12.8%
4.3%
3.8%
4.8%
CONSTRUCTION METHOD
DWELLINGS WITH RADON REDUCING FEATURES
Conventional Constructed On Site
With radon reducing features
No radon reducing features
Prefabricated Units (Panelized)
With radon reducing features
No radon reducing features
Modular
With radon reducing features
No radon reducing features
ALL Dwellings
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
38.2%
61.9%
0.0%
0.0%
0.0%
0.0%
38.2%
61.9%
100.0%
21.8%
78.2%
0.0%
0.0%
0.0%
0.0%
21.8%
78.2%
100.0%
3.9%
96.2%
0.0%
0.0%
0.0%
0.0%
3.9%
96.2%
100.0%
16.57%
83.43%
0.00%
0.00%
0.00%
0.00%
16.57%
83.43%
100.00%
SIZE OF BUILDER
DWELLINGS WITH RADON REDUCING FEATURES
One to Ten Dwellings Per Year
With radon reducing features
No radon reducing features
Eleven To Twenty-Five Dwellings Per Year
With radon reducing features
No radon reducing features
Twenty-Six To 100 Dwellings Per Year
With radon reducing features
No radon reducing features
Over 100 Dwellings Per Year
With radon reducing features
No radon reducing features
20.7%
34.8%
8.8%
11.4%
6.0%
9.6%
2.6%
6.1%
7.6%
39.3%
2.5%
8.4%
7.2%
25.1%
4.6%
5.5%
2.1%
39.1%
0.0%
15.2%
1.7%
20.2%
0.0%
21.7%
9.4%
41.9%
2.1%
11.1%
3.6%
17.5%
1.4%
12.9%
APPENDIX D
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2011 DATA
PAGES
METHODS EMPLOYED TO REDUCE RADON
Dwellings With Basements
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - BASEMENTS
Dwellings With Crawl Spaces
Passive stack subslab ventilation
Fan-driven (active) ventilation
Foundation Wall Vents
None
SUBTOTAL - CRAWL SPACES
Dwellings With Slabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALING METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings With Basements
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
SEALING METHODS - SLABS
(Multiple Answers Possible)
Dwellings With Slabs
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
ZONE 1
18.2%
25.7%
4.4%
14.3%
15.8%
78.4%
3.6%
0.5%
3.7%
5.3%
13.1%
0.4%
3.5%
0.4%
2.7%
1.6%
8.5%
100.0%
59.4%
13.2%
25.3%
8.3%
0.2%
24.2%
0.1%
29.5%
160.1%
71.6%
16.3%
21.7%
1.5%
0.9%
20.5%
0.0%
19.4%
152.1%
ZONE 2
10.3%
17.0%
2.5%
12.3%
16.0%
58.0%
0.6%
0.1%
2.6%
9.9%
13.1%
0.5%
1.5%
0.2%
14.7%
12.0%
28.8%
100.0%
48.5%
9.6%
24.9%
10.5%
1.7%
25.8%
0.0%
37.1%
158.1%
45.9%
7.6%
13.8%
2.2%
0.4%
1.2%
0.0%
41.8%
112.9%
ZONE 3
2.1%
0.4%
0.4%
4.6%
2.4%
9.9%
0.4%
0.3%
1.6%
11.1%
13.3%
0.1%
2.4%
0.0%
37.2%
37.1%
76.8%
100.0%
56.7%
8.0%
13.5%
7.3%
1.4%
7.3%
3.2%
36.2%
133.3%
41.1%
5.7%
12.7%
7.0%
0.1%
0.0%
0.0%
48.4%
115.0%
US TOTAL
7.7%
9.8%
2.1%
9.1%
10.1%
38.9%
1.6%
0.4%
2.6%
10.8%
15.4%
0.4%
2.4%
0.2%
20.9%
21.8%
45.7%
100.0%
57.0%
8.7%
16.5%
7.8%
0.8%
11.6%
0.1%
34.1%
136.7%
44.7%
8.5%
15.9%
3.7%
0.5%
5.6%
0.0%
39.9%
118.8%
APPENDIX D
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2011 DATA
PAGE 4
SUBSLAB PREPARATION -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
82.0%
8.0%
10.9%
3.4%
33.0%
49.1%
73.0%
3.6%
9.7%
272.6%
70.3%
8.0%
29.6%
1.8%
28.5%
33.5%
65.4%
9.4%
6.8%
253.1%
25.7%
4.7%
61.6%
1.5%
12.5%
6.1%
65.2%
4.7%
8.8%
190.6%
56.3%
6.3%
37.1%
2.4%
23.1%
24.4%
66.3%
5.8%
8.4%
230.1%
SUBSLAB PREPARATION -- BASEMENTS
(Multiple Answers Possible)
Dwellings On Basements
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
80.8%
8.5%
10.3%
3.5%
30.2%
49.8%
73.1%
3.7%
10.0%
269.8%
85.2%
4.7%
11.9%
2.5%
37.8%
42.1%
62.1%
12.6%
8.2%
267.1%
69.8%
1.9%
28.9%
6.9%
37.1%
39.5%
58.2%
3.0%
21.6%
266.7%
62.2%
5.4%
29.6%
5.1%
24.5%
32.4%
60.9%
8.1%
28.9%
257.2%
SUBSLAB PREPARATION -- SLABS
(Multiple Answers Possible)
Dwellings On Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
93.7%
3.0%
17.0%
1.9%
58.6%
42.9%
72.3%
2.5%
6.7%
298.6%
40.4%
14.5%
65.2%
0.2%
9.6%
16.0%
72.0%
3.0%
4.0%
224.9%
20.0%
5.0%
65.8%
0.8%
9.3%
1.8%
66.1%
4.9%
7.1%
180.8%
50.1%
6.1%
45.7%
2.0%
32.6%
19.7%
68.1%
4.0%
8.6%
237.0%
APPENDIX D
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2011 DATA
PAGES
COST OF PASSIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
ZONE 1
217
39.0%
29.8%
15.3%
6.4%
3.9%
1.1%
4.6%
100.0%
ZONE 2
138
28.6%
21.2%
20.7%
8.1%
13.8%
0.8%
6.8%
100.0%
ZONE 3
68
50.7%
19.5%
15.5%
3.3%
9.8%
0.3%
1.1%
100.0%
US TOTAL
423
36.2%
25.6%
17.8%
6.1%
7.8%
1.3%
5.3%
100.0%
COST OF ACTIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
89
20.6%
18.0%
11.7%
5.9%
18.0%
18.6%
7.2%
100.0%
62
22.6%
21.7%
14.7%
14.7%
3.5%
10.9%
12.0%
100.0%
28
60.2%
0.5%
23.7%
10.2%
0.0%
1.6%
3.8%
100.0%
177
17.6%
21.6%
10.9%
10.2%
7.2%
17.6%
14.8%
100.0%
APPENDIX D
-------
APPENDIX E
MULTI FAMILY
USAGE COEFFICIENT TABLES
BY THE THREE RADON EXPOSURE ZONES
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
MULTIFAMILY DWELLINGS - 2011 DATA
PAGE1
SAMPLE SIZE
Units
Builders
WGHTD AVERAGE UNITS PER BLDR
TYPE OF HOUSE: WITH RADON REDUCING FEATURES
One Story Dwellings With Basements
With radon reducing features
No radon reducing features
One story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
One Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Two Story Dwellings With Basements
With radon reducing features
No radon reducing features
Two Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Three Story Dwellings With Basements
With radon reducing features
No radon reducing features
Three Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATION -- EXCEPT PIERS
Basements
With radon reducing features
No radon reducing features
Crawl Spaces
With radon reducing features
No radon reducing features
Slabs on Grade
With radon reducing features
No radon reducing features
TOTAL
ALL DWELLINGS -- EXCEPT ON PIERS
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
ZONE 1
741
58
12.8
5.5%
15.7%
0.0%
2.0%
3.1%
16.5%
12.6%
13.5%
0.4%
1.4%
6.9%
8.5%
0.5%
6.9%
0.0%
0.2%
0.4%
5.6%
0.1%
100.0%
18.7%
36.2%
0.4%
3.6%
10.4%
30.6%
100.0%
29.5%
70.5%
100.0%
ZONE 2
1205
58
20.8
1.0%
6.3%
0.0%
3.9%
2.3%
20.6%
0.2%
3.6%
0.0%
4.8%
2.4%
13.6%
0.1%
1.5%
0.0%
4.2%
9.7%
12.4%
13.2%
100.0%
1.6%
13.1%
0.0%
14.9%
16.6%
53.8%
100.0%
18.2%
81.8%
100.0%
ZONE 3
784
44
17.8
1.3%
7.0%
0.0%
2.9%
0.4%
33.4%
1.3%
8.7%
0.0%
2.2%
0.4%
19.7%
1.3%
4.5%
0.0%
0.4%
0.0%
13.5%
2.9%
100.0%
4.1%
20.8%
0.0%
5.6%
0.8%
68.7%
100.0%
5.0%
95.0%
100.0%
US TOTAL
2731
160
18.6
3.8%
7.8%
0.0%
2.6%
2.3%
24.0%
4.2%
8.8%
0.1%
2.4%
3.2%
14.7%
1.2%
3.1%
0.0%
1.5%
3.7%
10.8%
5.7%
100.0%
9.4%
20.5%
0.1%
7.1%
9.9%
53.0%
100.0%
19.4%
80.6%
100.0%
APPENDIX E
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
MULTIFAMILY DWELLINGS - 2011 DATA
PAGE 2
TESTING OF DWELLINGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units With Basements
Tested For Radon Levels
Tested Units Needing More Work
Units With Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units With Slabs
Tested For Radon Levels
Tested Units Needing More Work
15.7%
29.7%
13.8%
40.8%
19.9%
14.2%
17.8%
19.9%
5.8%
10.0%
24.3%
14.5%
0.7%
0.0%
3.0%
3.0%
5.9%
0.0%
16.6%
0.0%
2.4%
0.0%
2.3%
0.0%
10.6%
20.4%
24.2%
23.4%
3.1%
11.3%
5.5%
14.5%
CONSTRUCTION METHOD
DWELLINGS WITH RADON REDUCING FEATURES
Conventional Constructed On Site
With radon reducing features
No radon reducing features
Prefabricated Units (Panelized)
With radon reducing features
No radon reducing features
Modular
With radon reducing features
No radon reducing features
ALL Dwellings
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
29.5%
70.5%
0.0%
0.0%
0.0%
0.0%
29.5%
70.5%
100.0%
18.2%
81.9%
0.0%
0.0%
0.0%
0.0%
18.2%
81.9%
100.0%
5.0%
95.0%
0.0%
0.0%
0.0%
0.0%
5.0%
95.0%
100.0%
19.4%
80.6%
0.0%
0.0%
0.0%
0.0%
19.4%
80.6%
100.0%
SIZE OF BUILDER
DWELLINGS WITH RADON REDUCING FEATURES
One to Ten Dwellings Per Year
With radon reducing features
No radon reducing features
Eleven To Twenty-Five Dwellings Per Year
With radon reducing features
No radon reducing features
Twenty-Six To 100 Dwellings Per Year
With radon reducing features
No radon reducing features
Over 100 Dwellings Per Year
With radon reducing features
No radon reducing features
10.0%
5.8%
15.4%
27.1%
4.2%
22.7%
0.0%
14.9%
2.3%
11.4%
0.0%
11.5%
0.5%
31.9%
15.4%
27.1%
0.8%
10.6%
0.0%
16.3%
4.1%
52.4%
0.0%
15.7%
5.4%
12.9%
4.8%
16.6%
4.3%
36.8%
4.9%
14.2%
APPENDIX E
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
MULTIFAMILY DWELLINGS - 2011 DATA
PAGES
METHODS EMPLOYED TO REDUCE RADON
Dwellings With Basements
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - BASEMENTS
Dwellings With Crawl Spaces
Passive stack subslab ventilation
Fan-driven (active) ventilation
Foundation Wall Vents
None
SUBTOTAL - CRAWL SPACES
Dwellings With Slabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALING METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings With Basements
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
SEALING METHODS - SLABS
(Multiple Answers Possible)
Dwellings With Slabs
Polyethylene/other membrn under slab
Membrane on fndtn. walls
Caulk around slab, wall opngs. & joints
Seal interior of foundation walls
Locate sump access outside of bsmt.
Install air tight sump pit covers
Other
None
TOTAL (may exceed 100%)
ZONE 1
12.6%
12.6%
6.1%
1.3%
22.4%
54.9%
0.4%
0.0%
1.4%
2.2%
4.0%
11.1%
7.7%
2.7%
10.1%
9.4%
41.0%
100.0%
42.7%
13.6%
15.6%
1.7%
0.0%
19.1%
0.0%
49.8%
142.4%
56.6%
14.4%
38.0%
0.0%
0.0%
37.5%
0.0%
28.9%
175.3%
ZONE 2
4.3%
1.1%
0.5%
3.1%
5.8%
14.7%
0.0%
0.0%
9.4%
5.5%
14.9%
12.4%
15.4%
1.2%
21.0%
20.4%
70.4%
100.0%
34.1%
15.0%
25.7%
17.7%
0.0%
6.4%
0.0%
46.7%
145.7%
35.9%
5.8%
11.5%
3.8%
0.0%
26.2%
0.0%
31.1%
114.4%
ZONE 3
0.0%
4.1%
0.0%
1.8%
19.0%
24.9%
0.0%
0.0%
1.3%
4.3%
5.6%
0.0%
0.8%
0.0%
26.8%
41.9%
69.5%
100.0%
23.8%
16.6%
16.6%
0.0%
0.0%
16.6%
0.0%
76.2%
149.9%
39.7%
0.0%
15.4%
7.5%
0.0%
0.0%
0.0%
60.3%
123.0%
US TOTAL
4.9%
6.5%
2.9%
2.6%
13.1%
29.9%
0.1%
0.0%
3.6%
3.4%
7.2%
7.6%
8.1%
1.7%
21.6%
23.8%
62.9%
100.0%
22.7%
19.6%
14.2%
3.7%
0.0%
14.6%
0.0%
62.1%
136.8%
44.4%
10.9%
20.0%
6.2%
0.0%
21.8%
0.0%
36.1%
139.4%
APPENDIX E
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
MULTIFAMILY DWELLINGS - 2011 DATA
PAGE 4
SUBSLAB PREPARATION -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
83.0%
9.4%
4.9%
0.0%
40.3%
41.0%
57.7%
2.8%
14.7%
253.8%
72.3%
6.7%
35.8%
1.0%
56.3%
19.4%
58.3%
0.2%
9.0%
258.9%
52.0%
2.1%
44.3%
4.2%
16.6%
9.5%
48.6%
17.4%
20.6%
215.3%
64.4%
6.4%
27.3%
0.8%
38.2%
25.6%
54.8%
11.3%
12.4%
241.3%
SUBSLAB PREPARATION -- BASEMENTS
(Multiple Answers Possible)
Dwellings On Basements
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
81.6%
5.2%
3.8%
0.0%
28.0%
44.1%
43.9%
2.6%
16.9%
226.1%
76.6%
3.4%
15.9%
0.0%
29.0%
31.2%
53.6%
1.1%
19.7%
230.5%
82.8%
0.0%
24.3%
16.0%
32.6%
32.6%
41.1%
11.7%
58.4%
299.3%
71.8%
3.3%
19.3%
0.6%
25.4%
26.6%
39.9%
11.0%
36.2%
234.3%
SUBSLAB PREPARATION -- SLABS
(Multiple Answers Possible)
Dwellings On Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
85.0%
15.0%
6.4%
0.0%
56.8%
36.8%
76.1%
3.0%
11.8%
290.9%
71.4%
7.4%
39.9%
1.2%
62.0%
16.9%
59.3%
0.0%
6.7%
264.9%
40.9%
2.9%
51.4%
0.0%
10.9%
1.2%
51.3%
19.5%
7.1%
185.1%
64.9%
7.1%
29.2%
0.3%
46.1%
22.4%
59.7%
10.1%
7.2%
247.0%
APPENDIX E
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
MULTIFAMILY DWELLINGS - 2011 DATA
PAGES
COST OF PASSIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
ZONE 1
33
45.4%
29.1%
11.5%
7.1%
5.1%
0.0%
1.8%
100.0%
ZONE 2
17
5.8%
53.4%
0.0%
7.3%
31.9%
0.0%
1.6%
100.0%
ZONE 3
7
47.1%
44.3%
0.0%
0.0%
8.6%
0.0%
0.0%
100.0%
US TOTAL
53
15.7%
48.0%
7.1%
1.4%
20.8%
0.0%
2.6%
95.6%
COST OF ACTIVE SUB-SLAB VENTILATION
Sample Size
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
14
56.5%
10.4%
8.2%
1.9%
2.5%
16.0%
4.6%
100.0%
10
5.2%
4.4%
44.1%
35.9%
0.0%
0.0%
10.5%
100.0%
100.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
18
32.2%
13.8%
3.2%
6.4%
0.3%
11.4%
1.1%
68.4%
APPENDIX E
-------
APPENDIX F
SINGLE-FAMILY DETACHED
PRODUCT USAGE TABLES
BY THE THREE RADON EXPOSURE ZONES
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE-FAMILY DETACHED PRODUCT USAGE - 2011 DATA
PAGE1
HOUSING STARTS
Single-Family Detached
TOTAL HOUSING STARTS (Excluding HUD Codi
TYPE OF HOUSE: WITH RADON REDUCING FEATURES
One Story Dwellings With Basements
With radon reducing features
No radon reducing features
One story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
One Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Two Story Dwellings With Basements
With radon reducing features
No radon reducing features
Two Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Three Story Dwellings With Basements
With radon reducing features
No radon reducing features
Three Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATION -- EXCEPT PIERS
Basements
With radon reducing features
No radon reducing features
Crawl Spaces
With radon reducing features
No radon reducing features
Slabs on Grade
With radon reducing features
No radon reducing features
TOTAL
ALL DWELLINGS -- EXCEPT PIERS
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
ZONE 1
100.4
100.4
12.9
30.0
2.4
6.3
2.3
3.1
16.9
18.0
1.7
2.7
1.6
1.5
0.4
0.2
0.0
0.0
0.0
0.1
0.2
100.4
30.2
48.3
4.1
9.0
3.9
4.6
100.2
38.2
62.0
100.2
ZONE 2
All Data in Thousands
114.2
114.2
9.1
21.5
0.5
7.5
1.6
22.2
12.2
21.4
0.2
6.4
0.3
8.6
0.8
0.8
0.0
0.2
0.0
0.1
0.7
114.2
22.1
43.7
0.8
14.1
1.9
30.8
113.5
24.8
88.7
113.5
ZONE 3
172.1
172.1
0.1
6.2
0.5
12.0
2.6
83.7
1.2
7.9
0.6
8.9
1.4
39.5
0.0
1.1
0.0
0.3
0.0
1.1
5.0
172.1
1.3
15.2
1.1
21.2
4.0
124.3
167.2
6.4
160.7
167.2
US TOTAL
386.7
386.7
22.1
57.8
3.4
25.8
6.6
108.9
30.3
47.3
2.5
18.0
3.2
49.6
1.2
2.2
0.0
0.5
0.0
1.2
5.9
386.7
53.6
107.3
6.0
44.3
9.8
159.8
380.8
69.4
311.4
380.8 .pp.
APPENDIX F
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE-FAMILY DETACHED PRODUCT USAGE - 2011 DATA
PAGE 2
All Data in Thousands
TESTING OF DWELLINGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units With Basements
Tested For Radon Levels
Tested Units Needing More Work
Units With Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units With Slabs
Tested For Radon Levels
Tested Units Needing More Work
21.7
5.2
23.4
6.4
18.0
0.9
11.9
0.5
15.6
2.4
22.6
3.9
11.0
0.4
3.6
0.4
8.0
0.4
15.1
3.9
7.8
0.2
7.2
0.0
45.3
8.0
61.1
14.2
36.8
1.4
22.7
0.9
CONSTRUCTION METHOD
DWELLINGS WITH RADON REDUCING FEATURES
Conventional Constructed On Site
With radon reducing features
No radon reducing features
Prefabricated Units (Panelized)
With radon reducing features
No radon reducing features
Modular
With radon reducing features
No radon reducing features
ALL Dwellings
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
38.3
62.1
0.0
0.0
0.0
0.0
38.3
62.1
100.4
24.9
89.3
0.0
0.0
0.0
0.0
24.9
89.3
114.2
6.6
165.5
0.0
0.0
0.0
0.0
6.6
165.5
172.1
69.9
316.9
0.0
0.0
0.0
0.0
69.9
316.9
386.7
SIZE OF BUILDER
DWELLINGS WITH RADON REDUCING FEATURES
One to Ten Dwellings Per Year
With radon reducing features
No radon reducing features
Eleven To Twenty-Five Dwellings Per Year
With radon reducing features
No radon reducing features
Twenty-Six To 100 Dwellings Per Year
With radon reducing features
No radon reducing features
Over 100 Dwellings Per Year
With radon reducing features
No radon reducing features
20.7
34.8
8.8
11.4
6.0
9.6
2.6
6.1
8.6
44.5
2.8
9.5
8.2
28.4
5.2
6.3
3.6
65.3
0.0
25.4
2.9
33.8
0.0
36.2
32.9
144.7
11.6
46.3
17.1
71.8
7.8
48.6
APPENDIX F
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE-FAMILY DETACHED PRODUCT USAGE - 2011 DATA
PAGES
METHODS EMPLOYED TO REDUCE RADON -- EXCEPT PIERS
Dwellings With Basements
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - BASEMENTS
Dwellings With Crawl Spaces
Passive stack subslab ventilation
Fan-driven (active) ventilation
Foundation Wall Vents
None
SUBTOTAL - CRAWL SPACES
Dwellings With Slabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALING METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings With Basements
Polyethylene or other membrane under slab
Membrane on foundation walls under slab
Caulk around slab, wall openings & joints
Seal interior of foundation walls
Locate sump access outside of basement
Install air tight sump pit covers
Other
None
ZONE 1
18.2
25.7
4.4
14.3
15.8
78.5
3.6
0.5
3.7
5.3
13.1
0.4
3.5
0.4
2.7
1.6
8.5
100.2
46.6
10.3
19.8
6.5
0.2
19.0
0.1
23.1
ZONE 2
All Data in Thousands
11.6
19.3
2.8
13.9
18.2
65.9
0.7
0.1
3.0
11.2
14.9
0.5
1.7
0.2
16.7
13.6
32.7
113.5
31.9
6.3
16.4
6.9
1.1
17.0
0.0
24.4
ZONE 3
3.5
0.7
0.7
7.7
4.1
16.6
0.6
0.5
2.7
18.5
22.3
0.2
4.0
0.0
62.1
62.0
128.4
167.2
9.4
1.3
2.2
1.2
0.2
1.2
0.5
6.0
US TOTAL
33.3
45.7
8.0
35.9
38.0
160.9
5.0
1.0
9.4
35.0
50.3
1.1
9.2
0.6
81.5
77.2
169.6
380.9
87.9
18.0
38.5
14.6
1.6
37.2
0.6
53.6
SEALING METHODS - SLABS
(Multiple Answers Possible)
Dwellings With Slabs
Polyethylene or other membrane under slab
Membrane on foundation walls under slab
Caulk around slab, wall openings & joints
Seal interior of foundation walls
Locate sump access outside of basement
Install air tight sump pit covers
Other
None
6.1
1.4
1.9
0.1
0.1
1.8
0.0
1.7
15.0
2.5
4.5
0.7
0.1
0.4
0.0
13.7
52.8
7.3
16.3
9.0
0.1
0.0
0.0
62.1
75.8
14.5
27.0
6.3
0.9
9.4
0.0
67.6
APPENDIX F
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE-FAMILY DETACHED PRODUCT USAGE - 2011 DATA
PAGE 4
All Data in Thousands
SUBSLAB PREPARATION -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
71.4
6.9
9.5
2.9
28.7
42.7
63.6
3.1
8.4
69.3
7.8
29.2
1.7
28.1
33.0
64.5
9.3
6.7
37.2
6.8
89.3
2.1
18.1
8.9
94.4
6.7
12.7
177.9
21.5
127.9
6.8
74.8
84.6
222.4
19.1
27.8
SUBSLAB PREPARATION -- BASEMENTS
(Multiple Answers Possible)
Dwellings On Basements
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
63.4
6.7
8.0
2.8
23.7
39.1
57.4
2.9
7.8
56.1
3.1
7.8
1.7
24.9
27.8
40.9
8.3
5.4
11.6
0.3
4.8
1.1
6.1
6.5
9.6
0.5
3.6
131.0
10.1
20.7
5.6
54.8
73.4
107.9
11.7
16.8
SUBSLAB PREPARATION -- SLABS
(Multiple Answers Possible)
Dwellings On Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
8.0
0.3
1.5
0.2
5.0
3.7
6.2
0.2
0.6
13.2
4.8
21.3
0.1
3.1
5.2
23.6
1.0
1.3
25.6
6.4
84.5
1.0
11.9
2.4
84.8
6.2
9.1
46.9
11.5
107.3
1.2
20.1
11.3
114.5
7.4
11.0
APPENDIX F
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
SINGLE-FAMILY DETACHED PRODUCT USAGE - 2011 DATA
PAGES
All Data in Thousands
COST OF PASSIVE SUB-SLAB VENTILATION
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
12.8
9.8
5.0
2.1
1.3
0.4
1.5
32.9
6.2
4.6
4.5
1.8
3.0
0.2
1.5
21.7
2.7
1.0
0.8
0.2
0.5
0.0
0.1
5.3
21.7
15.4
10.3
4.0
4.8
0.5
3.0
59.8
COST OF ACTIVE SUB-SLAB VENTILATION
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
1.1
1.0
0.6
0.3
1.0
1.0
0.4
5.3
0.7
0.7
0.5
0.5
0.1
0.3
0.4
3.1
0.7
0.0
0.3
0.1
0.0
0.0
0.0
1.2
2.5
1.6
1.4
0.9
1.1
1.3
0.8
9.6
APPENDIX F
-------
APPENDIX G
TOTAL PRODUCT USAGE TABLES
FOR ALL HOUSES
BY THE THREE RADON EXPOSURE ZONES
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
TOTAL PRODUCT USAGE - 2011 DATA
PAGE1
HOUSING STARTS
Single-Family Detached
Townhouses and Apartments
TOTAL HOUSING STARTS (Excluding HUD Codi
TYPE OF HOUSE: WITH RADON REDUCING FEATURES
One Story Dwellings With Basements
With radon reducing features
No radon reducing features
One story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
One Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Two Story Dwellings With Basements
With radon reducing features
No radon reducing features
Two Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Three Story Dwellings With Basements
With radon reducing features
No radon reducing features
Three Story Dwellings With Crawl Spaces
With radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
With radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATION -- EXCEPT PIERS
Basements
With radon reducing features
No radon reducing features
Crawl Spaces
With radon reducing features
No radon reducing features
Slabs on Grade
With radon reducing features
No radon reducing features
TOTAL
ALL DWELLINGS -- EXCEPT ON PIERS
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
ZONE 1
100.4
54.6
155.0
15.9
38.6
2.4
7.4
4.0
12.1
23.8
25.4
1.9
3.5
5.4
6.1
0.7
4.0
0.0
0.1
0.2
3.1
0.2
155.0
40.4
68.1
4.3
11.0
9.6
21.3
154.7
54.3
100.4
154.7
ZONE 2
All Data in Thousands
114.2
66.9
181.2
9.8
25.8
0.5
10.2
3.2
35.9
12.4
23.8
0.2
9.6
1.8
17.7
0.9
1.8
0.0
3.0
6.5
8.4
9.6
181.2
23.0
51.4
0.8
22.8
11.5
62.1
171.6
35.3
136.2
171.6
ZONE 3
172.1
101.8
273.9
1.5
13.3
0.5
14.9
3.0
117.7
2.6
16.7
0.6
11.1
1.8
59.6
1.4
5.7
0.0
0.7
0.0
14.8
8.0
273.9
5.4
35.8
1.1
26.7
4.8
192.2
266.0
11.3
254.6
266.0
US TOTAL
386.7
223.4
610.1
27.2
77.7
3.4
32.5
10.2
165.7
38.7
65.9
2.8
24.2
9.0
83.5
2.9
11.5
0.0
3.8
6.8
26.3
17.8
610.1
68.8
155.2
6.2
60.5
26.0
275.6
592.3
101.0
491.3
592.3
APPENDIX G
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
TOTAL PRODUCT USAGE - 2011 DATA
PAGE 2
All Data in Thousands
TESTING OF DWELLINGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units With Basements
Tested For Radon Levels
Tested Units Needing More Work
Units With Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units With Slabs
Tested For Radon Levels
Tested Units Needing More Work
30.2
7.7
30.9
9.5
28.9
1.4
21.6
2.4
19.0
2.8
36.7
6.0
11.4
0.6
5.3
0.5
13.8
0.4
31.6
3.9
10.1
0.3
9.4
0.0
63.0
10.9
99.2
19.3
50.4
2.2
36.3
2.9
CONSTRUCTION METHOD
DWELLINGS WITH RADON REDUCING FEATURES
Conventional Constructed On Site
With radon reducing features
No radon reducing features
Prefabricated Units (Panelized)
With radon reducing features
No radon reducing features
Modular
With radon reducing features
No radon reducing features
ALL Dwellings
With radon reducing features
No radon reducing features
TOTAL -- ALL DWELLINGS
54.4
100.6
0.0
0.0
0.0
0.0
54.4
100.6
155.0
37.1
144.1
0.0
0.0
0.0
0.0
37.1
144.1
181.2
11.7
262.2
0.0
0.0
0.0
0.0
11.7
262.2
273.9
103.2
506.9
0.0
0.0
0.0
0.0
103.2
506.9
610.1
SIZE OF BUILDER
DWELLINGS WITH RADON REDUCING FEATURES
One to Ten Dwellings Per Year
With radon reducing features
No radon reducing features
Eleven To Twenty-Five Dwellings Per Year
With radon reducing features
No radon reducing features
Twenty-Six To 100 Dwellings Per Year
With radon reducing features
No radon reducing features
Over 100 Dwellings Per Year
With radon reducing features
No radon reducing features
26.2
38.0
17.2
26.2
8.3
22.0
2.6
14.2
9.9
51.2
2.8
16.2
8.5
47.0
14.1
22.0
4.4
75.8
0.0
41.5
6.9
85.6
0.0
51.8
40.5
164.9
20.1
83.9
23.7
154.6
16.7
88.0
APPENDIX G
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
TOTAL PRODUCT USAGE - 2011 DATA
PAGES
METHODS EMPLOYED TO REDUCE RADON
Dwellings With Basements
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - BASEMENTS
Dwellings With Crawl Spaces
Passive stack subslab ventilation
Fan-driven (active) ventilation
Foundation Wall Vents
None
SUBTOTAL - CRAWL SPACES
Dwellings With Slabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALING METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings With Basements
Polyethylene or other membrane under slab
Membrane on foundation walls under slab
Caulk around slab, wall openings & joints
Seal interior of foundation walls
Locate sump access outside of basement
Install air tight sump pit covers
Other
None
ZONE 1
25.1
32.6
7.8
15.0
28.0
108.5
3.8
0.5
4.5
6.5
15.3
6.5
7.7
1.9
8.2
6.7
30.9
154.7
59.5
14.4
24.6
7.0
0.2
24.8
0.1
38.1
ZONE 2
All Data in Thousands
14.1
19.9
3.1
15.7
21.5
74.4
0.7
0.1
8.4
14.4
23.6
7.7
10.6
0.9
28.9
25.5
73.6
171.6
35.5
7.8
19.0
8.7
1.2
17.7
0.0
29.2
ZONE 3
3.5
4.8
0.7
9.4
22.9
41.2
0.6
0.5
3.9
22.8
27.8
0.2
4.8
0.0
88.6
103.4
197.0
266.0
15.7
5.6
6.5
1.2
0.2
5.5
0.5
25.5
US TOTAL
39.7
50.9
14.0
40.1
66.1
210.9
6.3
1.5
17.6
48.3
73.8
17.4
26.4
4.6
125.0
133.0
306.4
592.3
110.6
27.8
50.1
16.9
1.6
48.0
0.6
92.8
SEALING METHODS - SLABS
(Multiple Answers Possible)
Dwellings With Slabs
Polyethylene or other membrane under slab
Membrane on foundation walls under slab
Caulk around slab, wall openings & joints
Seal interior of foundation walls
Locate sump access outside of basement
Install air tight sump pit covers
Other
None
18.8
4.6
10.4
0.1
0.1
10.2
0.0
8.1
32.0
5.2
10.0
2.5
0.1
12.7
0.0
28.4
82.4
7.5
27.7
14.6
0.1
0.0
0.0
106.6
133.3
17.4
48.0
17.3
0.3
22.9
0.0
143.1
APPENDIX G
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
TOTAL PRODUCT USAGE - 2011 DATA
PAGE 4
All Data in Thousands
SUBSLAB PREPARATION -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
115.0
11.8
12.1
2.9
49.9
64.3
93.9
4.6
16.1
110.9
11.7
49.7
2.3
60.3
44.2
98.1
9.4
11.8
88.3
9.0
134.5
6.3
34.6
18.3
143.9
23.7
32.9
314.2
32.5
196.3
11.5
144.8
126.8
335.9
37.7
60.9
SUBSLAB PREPARATION -- BASEMENTS
(Multiple Answers Possible)
Dwellings On Basements
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
88.0
8.2
9.2
2.8
32.2
52.4
70.7
3.7
12.9
64.0
3.4
9.4
1.7
27.9
31.0
46.5
8.5
7.3
32.9
0.3
11.1
5.2
14.6
15.0
20.3
3.5
18.5
184.9
12.0
29.7
9.7
74.7
98.4
137.4
15.6
38.8
SUBSLAB PREPARATION -- SLABS
(Multiple Answers Possible)
Dwellings On Slabs
Crushed aggregate 4" or more deep
Crushed aggregate less than 4" deep
Sand
Strips of geotextile drainage mat
Sheets of rigid foam insulation
Perforated plastic pipe
Plastic sheet (vapor barrier)
Other
None
27.1
3.6
2.9
0.2
17.7
11.9
23.2
0.9
3.2
46.9
8.3
40.3
0.6
32.4
13.2
51.7
1.0
4.5
55.3
8.7
123.4
1.0
20.0
3.3
123.6
20.2
14.4
129.3
20.6
166.6
1.8
70.1
28.4
198.5
22.1
22.1
APPENDIX G
-------
BUILDER PRACTICES REPORT:
Copyright 2012, NAHB Research Center, Inc.
TOTAL PRODUCT USAGE - 2011 DATA
PAGES
All Data in Thousands
COST OF PASSIVE SUB-SLAB VENTILATION
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
17.9
13.1
6.3
2.9
1.9
0.4
1.7
44.2
6.8
9.7
4.5
2.5
6.0
0.2
1.6
31.3
5.0
3.2
0.8
0.2
0.9
0.0
0.1
10.2
29.7
26.0
11.6
5.5
8.8
0.5
3.4
85.6
COST OF ACTIVE SUB-SLAB VENTILATION
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
3.8
1.5
1.0
0.4
1.1
1.8
0.6
10.2
0.8
0.7
0.9
0.9
0.1
0.3
0.5
4.2
0.7
0.0
0.3
0.1
0.0
0.0
0.0
1.2
5.3
2.2
2.2
1.4
1.2
2.1
1.1
15.6
APPENDIX G
-------
APPENDIX H
ANNUAL BUILDER
PRACTICES QUESTIONNAIRE
-------
December 19, 2011
Dear Home Builder:
Dear Home Buer:
"* —
aw/frit/** <** *•**» ou are using so iky can
awi <** *•**»
to Low what products
Pennine the best ma
For more than 20 years,
professionals me you to
material market. Our data
are using so iky can
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buMmg product and
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NAHB
RESEARCH
CENTER
400 Prince George's Blvd
Upper Marlboro, MD 20774
301.249.4000
fax 301.430.6)80
www.nahbrc.com
survey will receive their choice of one of the
following gift. (Please check ONE)
• Navy Full-Zip Hooded Sweatshirt (M)
• Navy Full-Zip Hooded Sweatshirt (L)
• Navy Full-Zip Hooded Sweatshirt (XL)
• Navy Full-Zip Hooded Sweatshirt (2X)
• Navy Full-Zip Hooded Sweatshirt (33C)
Blue Dress 5
Blue Dress
Blue Dress
Blue Dress
Blue Dress
-------
Did you build any new homes in 2011?
Your firm is eligible to participate if it completed any single-family homes or multifamily units in 2011.
How to complete this survey:
Fill in the numbers or percentages, or check the appropriate boxes, to indicate the materials and specifications of the houses
your local building operations completed in 2011. If you don't know the exact answer, use thoughtful estimates.
Remember - you only need to answer for the types of houses you built in 2011. Please be assured that information about
your firm will remain confidential. Thank you for your support!
Please call Joanne McAlpin at (800) 638-8556, extension 6306 if you need assistance in filling out this survey.
SFD - Single-Family Detached:
Houses built for one family that do not
share any common walls or structural
systems with other houses.
SFA - Single-Family Attached:
Townhouses or duplexes that share at
least one common wall with another
house, but each house rests on its own
foundation.
MF - Multifamily:
Dwellings in buildings that share a
common foundation and usually some
common walls.
In which Country, State, and County or Parish did you build most of your houses in the year 2011?
Country: USA State: j County / Parish: 2 Email:
GENERAL CHARACTERISTICS
Number of houses (or living units)
Average square feet (sf) above-grade ...
SFD
STARTER
Finished sf typical basement
Average selling price
3
_sf_ 4
-Sf 5
- 6
SFD
MOVE-UP
-Sf 28
_ 29
SFD
LUXURY
SFA MF
TOWNHOUSE/DUPLEX MULTIFAMILY
49
Sf 50
Sf 51
72
73
Sf 74
Typical lot size (sf or acres) 7
Number of Multifamily Buildings your firm constructed (not living units) * * Multifamily Buildings * *
sf
(sf Per UNIT)
($ Per UNIT)
FOUNDATION TYPE
How many homes did your firm construct with the following foundation types?
SFD
STARTER
# HOUSES *
Full basement
Partial basement & crawl space
Partial basement & slab
Crawl space, continuous wall
Concrete slab on grade or pilings
Piers or raised pilings
9
10
11
12
13
14
SFD
MOVE-UP
# HOUSES*
32
33
34
35
36
37
SFD
LUXURY T
# HOUSES*
<;<;
56
57
5S
59
60
SFA
MF
TOWNHOUSE/DUPLEX MULTIFAMILY
# UNITS*
78
79
# BUILDINGS *
96
97
99
100
101
NUMBER OF STORIES
Do not include basement living areas except in Multifamily buildings.
SFD
STARTER
# HOUSES *
SFD
MOVE-UP
# HOUSES*
One or P/2 (include split levels)
Two or 2!/2
Three or 3!/2
Four or more stories ****
15
16
17
38
39
SFD SFA MF
LUXURY TOWNHOUSE/DUPLEX MULTIFAMILY
# HOUSES * # UNITS * # BUILDINGS *
61
62
63
84
86
87
lOla
102
103
104
-------
GARAGES AND CARPORTS
SFD
STARTER
# HOUSES »
ICarGarage 18
2CarGarage 19
3 or more Car Garage 20
ICarCarport 2oa
2 or more Car Carport 2ob
No Garage or Carport 21
NUMBER OF ROOMS
SFD
STARTER
# ROOMS
PER HOUSE »
Bedroom(s) 22
Half Bathroom(s) 23a
Full or 3/4 Bathroom(s) 23
Total Rooms (Exclude Bathrooms) 24
Closets (Include Coat / Linen / Pantry) 2s
SFD
MOVE-UP
# HOUSES*
43b
SFD
MOVE-UP
# ROOMS
PER HOUSE *
SFD SFA MF
LUXURY TOWNHOUSE/DUPLEX MULTIFAMILY
# HOUSES •»• # UNITS # # UNITS *
66b
SFD SFA MF
LUXURY TOWNHOUSE/DUPLEX MULTIFAMILY
# ROOMS # ROOMS # ROOMS
PER HOUSE •»• PER UNIT » PER UNIT *
48
107
SUBSLAB PREPARATION
What did you place under your concrete slab floors for your
living areas?
SLAB- BASEMENT
(Sail you use) ON-GRADE SLAB
4" or greater layer of stone or gravel [ ] 12i_i [ ] 121,2
Less than 4" layer of stone or gravel [ ] 122,1 [ ] 122,2
Sand [ ] 122c_i [ ] i22c_2
Strips or layers of geotextile drainage mat [ ] 123,1 [ ] 123,2
Rigid foam insulation [ ] 124,1 [ ] 124,2
Perforated plastic pipe [ ] i2s_i [ ] 125,2
Plastic sheet [ ] 125c_i [ ] i25c_2
Other [ ]126_i [ ]i26_2
(PLEASE SPEC/ v i
Nothing under slab
[ ] 127,1 [ ] 127,2
2010 Certification Levels
National Green
Building Standard
GOLD
15%
SILVER
38%
EMERALD
5%
BRONZE
42%
-------
BASEMENT / CRAWL SPACE WALL MATERIAL
What percent of your homes or multifamily buildings had
basement or crawlspace walls made of the following materials?
Do not include brick veneer.
SFD SFA MF
HOUSES UNITS BUILDINGS
Poured concrete, reusable forms
Concrete block (CMU)
Precast concrete
(e.g., Superior Walls®)
Insulated Concrete Forms (ICFs)
Pressure treated wood
Other
(PLEASE SPECIFY)
100%
100%
. nob
. lllb
. 112b
. 113b
100%
. 114b
ABOVE-GRADE STRUCTURAL WALLS
What percent of your homes' above-grade exterior walls had the
following as a primary structural material?
Do not include foundation walls or brick veneer finish.
FIRST STORY UPPER STORIES
Concrete or masonry
Wood (all types)
Steel (all types)
100%
100%
Most Popular Resource Efficiency
Provisions (600 Series) For Certified
Green Homes, NGBS
Advanced Framing Techniques
Engineer eel Wood Structural Members
Covered En tries/Exits
Pre-finished Materials
Gutter System Carries 5 from
Foundation
Drip-edge at Eaves & Edges
94%
0% 20% 40% 60% 80% 100U/
TYPE OF WOOD WALL STUDS
What is the most common type or species of woodfor your wall
studs? (
Southern yellow pine (SYP) .... [ ]l
Douglas fir [ ]2
Hem-fir or other western woods [ ]s
Spruce / Pine / Fir (SPF) or eastern spruce [ ]4
LSL (laminated strand lumber, Timberstrand®, SolidStart®, etc) [ ] 5
LVL (laminated veneer lumber) [ ]6
Don'tknow [ ]7
Other I 18
(PLEASE SPECIFY)
What percent of your wood wall studs were:
Preservative treated
Finger jointed (any species)
145
CONCRETE & MASONRY ABOVE-GRADE WALLS
If any of your homes had concrete or masonry above-grade walls,
what per cent were each of the following types?
Do not include basement walls or brick veneer finish.
Poured concrete, reusable/temporary forms
Concrete block (CMU)
Precast concrete (e.g., Superior Walls®)
Insulated Concrete Forms (ICFs)
Autoclaved aerated concrete (AAC)
Other concrete or masonry
(PLEASE SPECIFY)
. 146
. 147
. 148
. 149
100%
. 150
LIGHT-FRAME EXTERIOR WALL DEPTH & SPACING
What percent of all your exterior light-frame walls were:
WOOD STEEL
2x4s at 16" o.c.
2x4s at 24" o.c.
2x6s at 16" o.c.
2x6s at 24" o.c.
Other
. 141
. 141a
. 142a
. 143
. 143a
(PLEASE SPEC" i-V:
100%
. 144
100%
. 144a
-------
INTERIOR WALLS
What percent of all your interior walls were:
Masonry or concrete
Steel (all spacing)
Lumber: 2x3s at 16" o.c
Lumber: 2x3s at 24" o.c
Lumber: 2x4s at 16" o.c
Lumber: 2x4s at 24" o.c
Lumber: 2x6s at 16" o.c
Lumber: 2x6s at 24" o.c
Lumber: Other dimensions / spacing
.516
.517
100%
WALL HEADERS:
WINDOWS, DOORS, AND FIREPLACES
What percent of the (1) single window, door, and fireplace
openings, (2) multiple window and door openings, and (3) garage
door openings were spanned by headers of the following
materials? SINGLE MULTIPLE
Window / Door Window Garage
/ Fireplace / Door Door
Headers Headers Headers
Built-up dimensional lumber
Solid wood (4xs, etc.)
Glulam
Wood I-joists used singly...
Wood I-joists doubled
LVL single
LVL doubled...
Parallam®
Concrete
Steel (all types)
Glued & nailed box headers
. 156
. 159
159a
Wood truss
LSL (laminated strand
lumber, Timberstrand®.
SolidStart®, etc)
Flitch plate beams (lumber
with steel plate, bolted)
. 160
160a
165a
. 174
EXTERIOR WALL SHEATHING
Please consider "sheathing" to be the panel product that is
fastened directly to wall studs. What percent of your total
exterior wall area was sheathed with:
NONE (SIPs, masonry, log walls, etc.) 182
Plywood, 3/8" 183
Plywood, 1/2" 184
Plywood, 5/8" 185
Plywood, 3/4" 186
ZIP Wall System® (Huber) .. 186a
OSB, 3/8" 187
OSB, 7/16" 188
OSB, 1/2".... 188a
OSB, 5/8" 189
OSB, 3/4" 190
Fiberboard(Stedi-R®'Bildrite®'etc) 191
Gypsumboard (including Dens-Glass®, FibeRock®) 193
1/8" foil-faced 3-ply kraft paper (Thermo-ply®)..
Dow SIS ...
Extruded polystyrene - XPS (blue
Dow Styrofoam®, pink Owens Corning)
194
. 195
Expanded polystyrene - EPS, or "bead board"
Polyisocyanurate (Tuff-R®, Thermax®, R-Max®)
Other
(PLEASE SPECIFY)
. 197
. 198
100%
. 199
100%
. 166
166a
. 180
TWO LAYERS OF EXTERIOR WALL SHEATHING
What percent of your homes had a layer of foam sheathing
placed over a layer of structural sheathing material? Do not
include layer of foam for EIFS finish. %
Check the most common material for second layer of foam:
1 XPS 2 f 1 EPS , [ 1 Polyisocyanurate
THICKNESS OF FOAM
What was the typical thickness of the foam you used?
i [ ] 1/2" 4 [ ] 1-1/2"
2 [ ] 5/8 or 3/4" 5 [ ] 2" or greater
3 [ ] 1"
What percentage of your homes are fully sheathed with either
plywood or OSB? _ 2025
100% 100%
-------
MATERIAL OF STRUCTURAL FLOOR SYSTEM
What percent of your structural floors in finished areas of your
homes (exclude basement and garage floors) were:
GROUND UPPER
FLOOR
FLOORS
Cast-in-place concrete
Precast concrete
Wood or lumber
Steel (all types)
218
100%
100%
DEPTH OF STRUCTURAL FLOOR
For each material you used, Sthe most common depth of your
floor framing:
LUMBER WOOD OPEN-WEB STEEL
JOISTS I-JOISTS JOISTS JOISTS
[ ]l
[ ]2
[ ]3
10" (or 9-7/8")
12" (or 11-7/8")
14"orgreater
[ ]4
1035a
SPACING OF FLOOR FRAMING
What percent of your framed floor area had joists spaced at:
LUMBER WOOD OPEN-WEB STEEL
JOISTS I-JOISTS JOISTS JOISTS
12"o.c....
16" o.c
19.2" o.c....
24"o.c....
32" o.c.
Other spacing
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1048a
1049a
1050a
1051 a
1052a
1053a
100%
100%
100%
100%
SPECIES OF WOOD FLOOR FRAMING
What species of dimensional lumber joist (not I-joists) did you
most commonly use for your floor framing?
Southern yellow pine (SYP) [ ]i
Douglas fir or hem-fir [ ]2
Spruce / Pine / Fir (SPF), or eastern spruce [ ]3
Treated lumber [ ] 4
Don'tknow [ ]s
Other [ ]6
(PLEASE SPECIFY) 230
FLOOR SHEATHING (SUBFLOORING)
What percent of your total floor area used each of the following
sheathing (sub-flooring) materials?
GROUND UPPER
FLOOR FLOORS
Concrete or SIPs 931 946
1/2" plywood
5/8" plywood
3/4" plywood
1-1/8" plywood
7/16" or 1/2" OSB
5/8" OSB ...
3/4" OSB ...
7/8" OSB
1" OSB ...
1-1/8" or thicker OSB
Ix boards (3/4"actual, including T&G)
2x boards (1-1/2" actual, including T&G)
Other
232
233
234
235
236
237
238
240
241
243
244
245
247
248
249
250
251
252
253
255
256
258
259
260
(PLEASE SPECIFY)
TYPE OF WOOD FLOOR FRAMING T. ,„„„,, , , ,
What percent of your structural wood floors on ground and upper {^"f^f^ sheathinS> what was the ^Pical
floors were:
Do not include support beam, GROUND UPPER
FLOOR FLOORS
slabs, or concrete.
Lumber joists, solid wood
Wood I-joists
Open-web joists (wood floor truss)
Structural Insulated Panels (SIPs)
Other wood
(PLEASE SPECIFY)
brand or type? (Sone)
Generic or commodity [ ]i
Advantech (Huber) [ ]2
EdgeGold (Weyerhaeuser) [ ]3
Pinnacle (Norboard) [ ] 4
Point Six (Durastrand) [ ]5
TopNotch(LP) [ ]6
Other [ ]7
(PLEASE SPECIFY) n230
-------
RIMBOARD FOR WOOD I-JOISTS
What percent of your I-joist floor systems used each of the
following rimboard materials?
NO rimboard used (sheathing only) n
LSL (laminated strand lumber.
Timberstrand®, SolidStart®, etc)
OSB (G-P Fiberstrong®, L-P Solid Start®, etc.)
1117a
Wood I-joists with blocking 1117c
Plywood .. 1117d
Dimensional lumber (2xlO's, etc.) m7e
LVL (laminated veneer lumber) 1117f
Re-sawn glulam 1117g
100%
FLOOR BEAMS: SUPPORT, FLUSH, AND EDGE BEAMS
Floor beams may include 1) support beams, which provide a
bearing point for floor joists, 2) flush beams, which provide
support and are recessed into the floor, and 3) edge beams
that typically support the edge of a loft or stairway (exclude
rimboard).
About how many linear feet (LF) of floor beams did you use in
a typical house or multifamily living unit?
GROUND
FLOOR
UPPER
FLOORS
Single-family detached (SFD)
floor beams: LF perHOUSE
Single-family attached (SFA)
floor beams: LF perUMT
Multifamily
floor beams: LF perUMT
FLOOR BEAM MATERIAL
What percent of your floor beams were:
. LF1064
. LFiQ64a
GROUND UPPER
FLOOR FLOORS
Built-up dimension lumber
Solid lumber (4x6 or greater)
Glulam
LVL...
Parallam®
1099
1100
1101
1102
1103
1108
1109
1110
mi
1112
LSL (laminated strand lumber.
Timberstrand®.
SolidStart®, etc)
Open-web Joist
Steel (all types)
I-Joist (multiple)
Other
(PLEASE SPECIFY)
100%
.1103a
. 1104
. 1105
. 1106
. 1107
100%
.1112a
. 1113
. 1114
. 1115
. 1116
ROOF BEAMS AND CEILING SUPPORT BEAMS
For a typical house or multifamily building, how many linear
feet (LF) of roof beams (ridge, hip, and valley) and beams
located on the ceiling assembly did you use?
Do not include wall headers that support roofs.
Single-family detached (SFD) roof beams
Single-family attached (SFA) roof beams
Multifamily building roof beams
LF
.LF
. LF I
What percent of your roof and ceiling assembly beams were:
Built-up dimensional lumber 108i
Solid lumber (4x6 or greater)
Glulam
LVL
Parallam® 1085
LSL (laminated strand lumber.
Timberstrand®, SolidStart®, etc) 1085a
1082
1083
1084
Girdertruss lose
Steel (all types) i087
I-Joist (multiple) 1088
Other
(PLEASE SPECIFY)
100%
1089
ROOF FRAMING
What percent of the total roof area on your homes were the
following shapes?
Gable 2ei
Hip .. 262
Gambrel 263
Flat... 264a
Other 264
(PLEASE SPECIFY)
100%
TYPE OF ROOF FRAMING
What percent of your houses had roofs framed with:
Combination of trusses and rafters
Rafters only
Trusses only
Structural Insulated Panels (SIPs)
Beams and purlins
Other
(PLEASE SPECIFY)
100%
-------
SPECIES OF ROOF FRAMING LUMBER
What percent of your dimensional lumber trusses or rafters /
ceiling joists (not I-joists) were:
TRUSSES
RAFTERS
Southern yellow pine (SYP)
Douglas fir or hem-fir
Spruce / Pine / Fir (SPF)
Treated lumber
Don'tknow
Other
28 :
(PLEASE SPEC: FY i
283
284
100%
100%
288
289
RAFTER ROOFS
If you built with rafters, what percent of your rafters were:
Lumber 2ie
I-joists 277
Steel 278
100%
TRUSS ROOFS
If you built with roof trusses, what percent of your trusses were:
Lumber (standard) 276a
Lumber (Raised Heel or Energy Truss)
I-joists
Steel
. 276b
. 277a
. 27 8a
100%
CEILING TYPE
What percent of the ceiling area directly under the roof was:
Sloped (i.e., cathedral or vaulted) 296
Flat
•91
100%
ROOF PITCH
What percent of your roofs had pitches of:
Flatto!/2 712"
!/2 / 12" to 4/12"
5/12"or6/12"
7/12" or 8/12"
9/12" or 10/12"
11/12" or greater
. 290
. 291
. 292
. 293
. 294
. 295
100%
ROOF VENTILATION
What percent of your homes and multifamily buildings had:
ME
SFD
SEA
BUILDINGS
Ridge vents
Roof vents - not powered
Wind turbine roof vents
Roof mounted attic fans
Gable wall louvers
Gable mounted attic fans
Whole house fans
Soffit vents
. 329
. 330
. 331
. 332
. 333
. 334
. 335
. 329a
. 330a
. 331a
. 332a
. 333a
. 334a
. 335a
. 336a
. 329b
. 330b
. 331b
. 332b
. 333b
. 334b
. 335b
. 336b
ROOFING MATERIAL
What percent of your total roof area was finished with:
Asphalt shingle, three tab, standard weight
Asphalt shingle, "Architectural" or laminated
Cedar shingles (sawn)
Cedarshakes (split)
Clay or ceramic roof tiles
Concrete roof tiles
Fiber cement shingles
Slate (natural)
Steel
Aluminum
Copper
Built-up roof (e.g., hot-mopped asphalt)
Single ply (EPDM, vinyl, modified bitumen)
Composite shingles (plastic or recycled rubber)
Other
.311
.312
.316
.319
. 320
(PLEASE SPECIF, :
100%
METAL ROOFING STYLE
If you used metal roofing, what percent of your metal roofing
(exclude copper) was:
Metal shakes/shingles/tiles
Standing seam/Vertical ribbed
Corrugated
Flat panel
Granulated
Don'tknow
Other
(PLEASE SPECIFY *
310v
311v
312v
313v
322cv
322bv
322av
100%
Totals need not add to 100%
Most Popular Energy Efficiency
Provisions (700 Series) For Certified
Green Homes, NGBS
3rd Party Inspection of EE Systems
Energy Star Dishwasher
Energy Star Refrigerator
Energy Star Bulbs or Lighting Fixtures
Energy Star Lighting Fixtures
Insulation and Air Sealing
0% 20% 40% 60% 80% 100%
-------
ROOF SHEATHING
What percent of your total roof area was sheathed with:
NONE (roofing attached directly to framing, or SIPs) 29s
3/8" plywood 299
1/2" plywood soo
5/8" plywood 30i
3/4" plywood 302
ZIP Roof System® (Huber) .. 302a
7/16" OSB (including Radiant Barrier Sheathing) 303
1/2" OSB (including Radiant Barrier Sheathing) 3o3a
5/8" OSB (including Radiant Barrier Sheathing) 304
3/4" OSB (including Radiant Barrier Sheathing) 305
l"x boards (3/4" actual) - no spacing 306
l"x boards (3/4" actual) - spaced 30?
2"x lumber (1 -1/2" actual - including T&G) 308
Other
. 341
.344
. 343a
. 343b
. 343c
(PLEASE SPECIFY)
SIDING / EXTERIOR FINISH MATERIAL
What percent of the total exterior wall area for all the homes you
built, including garages and dormers, was finished (sided) with
the following materials?
Wood-based Siding
Plywood panels (e.g., T-lll)
OSB (e.g., LP SmartSide®) ..
Hardboard
Cedar shingles (sawn) or shakes (split)
Cedar boards
Redwood boards
Other wood boards
Other wood-based siding
(PLEASE SPECIFY)
Masonry and Cement Materials
Brick
Natural stone
Manufactured stone ("synthetic stone")
Cement stucco
Synthetic stucco orEIFS (e.g., Dryvit®, STO®)
Architectural concrete block (split-face, etc.)
Fiber cement siding
(e.g., HardiePlank®, CertainTeed)
Plastic & Metal Siding
Vinyl
Alum
Steel
Other
.348
.349
.353
100%
What percent of your soffit, fascia, & exterior trim material was:
SOFFIT
NO soffit or fascia installed
Cedar boards
Redwood boards
Other wood boards
Plywood/LVL
OSB (LP SmartSide®)...
Hardboard or Wood Fiber Composite
Stucco
Vinyl (wrap for fascia)
Aluminum (wrap for fascia)
Steel
Fiber cement
Cellular PVC (Azek®,Kama®,etc)....
Urethane
Plastic composite (Trex®, etc)
Other
(PLEASE SPECIFY) , ftfto/
1UU /o
. 358
. 359a
. 359b
. 359c
. 360a
. 362
. 361
. 363
. 364
. 365
. 365b
. 365c
. 365e
. 365d
. 365f
. 365a
inum
(PLEASE SPECIFY)
TRIM MATERIAL
FASCIA
366
367a
367b
367c
368a
370
369
371
372
373
37 3b
37 3c
37 3e
373d
37 3f
37 3a
357
100%
EXTERIOR TRIM
719
720a
720b
720c
721
723
722
723a
723b
723c
725
725a
725c
725b
725d
724
100%
100%
-------
WINDOWS
AVERAGE WINDOW OPENINGS PER HOUSE
What was the average number of window openings (in the wall
framing) in your typical house?
Exclude openings for doors and non-prime windows.
SFD SFD SFD SFA MF
Starter Move-up Luxury Per UNIT Per UNIT
. 37 4a
. 374b
. 37 4c
.375
AVERAGE WINDOW UNITS PER HOUSE
Considering that some window openings have more than one
window unit per opening: how many window units were in your
typical home?
Include both operable (venting) and fixed units.
Average number of window units per new home:
SFD SFD SFD SFA MF
Starter Move-up Luxury Per UNIT Per UNIT
. 37 7b
. 377c
GLAZING
What percent of your windows were:
Single glazed .....................................
Double glazed ...................................
Triple glazed or more ........................
Heat-Mirror® ...
.423
.424
.425
100%
GLASS TYPE
What type of glass did your windows most commonly have?
Clear
Low-E
Gas filled (Argon, Krypton, etc)
Tinted
Impact resistant
Totals need not add to 100%
MATERIAL OF WINDOW FRAMES
What percent of all the window units you installed had the
follow ing frame material?
<
Wood (no cladding)
Wood, aluminum clad
Wood, vinyl clad
Aluminum
Vinyl
Composite
Other
MF
SFD SFA UNITS
380 387 394
381 388 395
382 389 396
383 390 397
384 391 398
385 392 399
386 393 400
(PLEASE SPECIFY)
WINDOW TYPE
What percent of all the window units you installed were:
MF
SFD SFA UNITS
Casement
Awning
Double hung
Single hung
Sliding (side-by-side)
Fixed, rectangular
Fixed, non-rectangular....
Other
(PLEASE SPECIFY)
. 401
. 408 415
. 402
.409 416
. 403
.410 417
. 404
.411
. 418
.412 419
.406
. 413 420
. 414 421
. 407 a
. 414a 421a
100% 100% 100%
SKYLIGHTS AND ROOF WINDOWS
How many skylights/roof windows did your typical house have?
MF
SFD SFA Per BUILDING
Skylights
Tubular Skylights
Roof windows
. 324
. 328
EXTERIOR SHUTTERS
How many PAIRS of exterior shutters did your typical
house have? MF
SFD SFA Per UNIT
What percent of the shutters were made of:
Wood (any type) 732
Plastic (including
polyurethane and PVC)
Other
734
. 734a
. 734b
100% 100% 100%
What percent of the shutters were of the following styles?
Raised panel 735 735a :
Louvered 736 736a :
Board and Batten 737 737a :
Other
. 738
738a
100%
100%
100%
100% 100% 100%
-------
PATIO DOORS
How many patio door openings did your typical house have?
Please include both sliding and hinged patio doors.
SFD SFD SFD SFA MF
Starter Move-up Luxury Per UNIT Per UNIT
. -129c
. 430
.431
PATIO DOOR TYPE
What percent of all your patio doors were:
SFD SFA
Hinged/Swinging
Sliding
MF
100%
100%
100%
.440
. 448
PATIO DOOR MATERIAL
What percent of all your patio doors were:
HINGED SLIDING
Wood (no cladding)
Wood, aluminum clad
Wood, vinyl clad
Steel
Aluminum
Vinyl
Composite (fiberglass, etc.)
Other
.441
. 449
.442
. 450
.443
.444
.451
(PLEASE SPEC;; v:
100%
445
100%
.453
Most Popular Indoor Environment
Quality Provisions (900 Series) For
Certified Green Homes, NGBS
No Building Materials with Visible Mold
One Exterior Penetration Sealed
Attic or Kneewall Access Sealed
No Plumbing in Exterior Walls
Two Exterior Penetrations Sealed
7%
0% 20% 40% 60% 80% 100%i
EXTERIOR DOORS
How many exterior entry door OPENINGS were in your typical
house?
Exclude patio doors.
SFD SFD SFD SFA MF
Starter Move-up Luxury Per UNIT Per UNIT
454a 454b 454c 455 456
EXTERIOR DOOR MATERIAL
What per cent of all your exterior doors were: (Ifglass, answer
for frame material)
Exclude patio doors. FRONT OTHER
Solid wood - raised panel 457 462
Wood-flush
Steel - raised panel
Steel - flush
. 463
Fiberglass
Other
. 160
.465
(PLEASE SPECIFY)
461a
100% 100%
. 466a
DOUBLE FRONT DOORS
What percent of your front doors were double doors? 467
SIDELITES
What percent of your front doors had sidelites?
Sidelites on one side 46x
Sidelites on both sides
NO sidelites
100%
. 469
MULTIFAMILY COMMON ENTRY DOORS
In some multifamily buildings, the individual living units have
entry doors opening directly to the outside. Other buildings have
common entry doors opening to hallways leading to entry doors
for the individual living units.
What percent of your multifamily buildings used
common entry doors? 47ia
Of the new multifamily buildings with common entry doors,
how many common entry doors, including
double doors, did a typical building have? 47ib
10
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DRIVEWAYS
The following questions deal only with single-family homes.
Percent of single-family homes with driveways 77
Length (in feet) of typical driveway
Width (in feet) of typical driveway
GARAGE DOOR CONFIGURATIONS
What percent of your garages had the following types of doors?
One single-wide door 750a
One double-wide door 750
Two single-wide doors 75i
One double-wide door, one single-wide door 752
Three single-wide doors 753
Other configuration
(PLEASE SPECIFY)
100%
What percent of your driveway surfaces were made of:
Asphalt
Poured concrete (including stamped/stenciled)...
Brick paver
Concrete paver
Gravel or crushed stone w/ parking pad
Gravel or crushed stone w/ no parking pad
Other
(PLEASE SPECIFY)
100%
783
GARAGE DOOR OPTIONS
What percent of your garage doors were the following types?
Sectional 739
One-piece (canopy or retractable) 740
Side-hinged 74i
Other 742
100%
What percent of your garage doors were the following materials?
Steel
Wood
Fiberglass or Plastic
Other
What percent of your garage doors had openers? ..
100%
. 757
. 745
FINISHED FLOORING TYPE
What type of flooring do you most commonly install in the following rooms?
Wall-
to-Wall Hardwood Hardwood Vinyl Vinyl Ceramic
(Sonly one box per row) Carpet (solid) (engineered) Sheet Tile Laminate Tile
Entry foyer (S0ne)
Living room (Sbne)
Dining room (Sow)
Family K
Kitchen (
Bedrooms (Sbne)
Half bathrooms
Full bathrooms
Hallway (Sbm)
Finished basem
11
Slate
Marble
e) D
ne) ... D
me)
m**,f
, rec room (S0ne) D
D
)... D
fSbne) D
Sbne) D
nt (Sbne) . . D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
Other
10
D
644
n647
D648
I—I 649
-------
R-VALUE
INSULATION
FLAT CEILINGS / ATTIC INSULATION MATERIAL
What percent of your total flat ceiling areas (e.g., attics) were
insulated with the following materials, and what was the typical
R-value? % FLAT
CEILINGS
INSULATED
NOT insulated 820
Fiberglass batt and blown
Fiberglass batt
Fiberglass blown
Rockwoolbatt
Rockwool blown
Cellulose blown
Spray foam
Foam board
Other
812
813
814
815
816
81 2r
813r
814r
815r
81 6r
(PLEASE SPECIFY)
.819
. 819r
100%
SLAB-ON-GRADE FOUNDATION INSULATION
What type of insulation did you typically use with slab-on-grade
foundations, beneath the slab and / or around the perimeter?
One Sper column:
BENEATH SLAB PERIMETER
Extruded polystyrene
(e.g., Dow-Styrofoam®, etc.) [
Expanded polystyrene (bead board) [
Polyisocyanurate (e.g., Thermax®) [ L j3
Fiberglass [ [ ]4
No insulation used for slab ..
FOUNDATION WALL INSULATION TYPE
What material did you typically use to insulate your basement
or crawl space walls, and what was the R-value?
If you insulated both the interior and exterior surfaces, you
may Stwo materials; otherwise Sonly one.
MATERIAL
Fiberglass batt or blanket [
Rockwoolbatt [
Fiberglass / rockwool board [
Extruded polystyrene (XPS) [
Expanded polystyrene (EPS) [
Polyisocyanurate [
Spray foam [
Other
(PLEASE SPECIFY)
851_1
851_2
851_3
851_4
851_5
851_6
851_8
851 7
R-VALUE
851_lr
851_2r
851_3r
851_4r
851_5r
851_6r
851_8r
851 7r
HOUSES INSULATED BETWEEN FLOOR JOISTS
What material did you typically use to insulate between ground
floor joists and what was the typical R-value?
MATERIAL R-VALUE
Fiberglass batt or blanket [
Rockwoolbatt [
Fiberglass blown [
Cellulose blown [
Spray foam [
Foam board or SIPs....
THICKNESS OF SLAB INSULATION MATERIAL
What was the typical thickness of the insulation you used with
slab-on-grade foundations, beneath the slab and / or around the
perimeter? One Sper column:
BENEATH SLAB PERIMETER
3/4" [ ] [ h
1-1/2" [ ]
2" or more [ ]
845
BASEMENT AND CRAWL SPACE INSULATION
What method did you typically use to insulate the foundations of
homes with basements or crawl spaces? (One Sper column)
BASE- CRAWL
MENTS SPACES
Between floor joists of the ground floor [ ] [ ]i
Entire interior and exterior surfaces
of the foundation wall [ ] [ ]2
Entire interior surface of foundation wall [ ] [ ] 3
Only above-grade interior [ ] [ ]4
Entire exterior surface of foundation wall [ ] [ ]5
Only below-grade portion of foundation
wall exterior [ ] [ ]6
Only above-grade portion of foundation
wall exterior [ ] [ ]7
Foundation wall cavity [ ] [ ]8
NO foundation insulation used [ ] [ ]9
GARAGE INSULATION
What percent of your garages had insulation installed in the:
Ceilings 853
All walls 854
Only walls shared with living space sss
Total need not add to 100%
WALL CAVITY INSULATION MATERIAL
What percent of your homes had the following wall cavity
insulation materials, and what were their R-values?
Do not include foam exterior wall sheathing.
% HOMES R-VALUE
NO wall cavity insulation
Fiberglass batt
Rockwoolbatt
Fiberglass blown behind mesh
Fiberglass blown-in, no mesh
Cellulose blown behind mesh ....
Cellulose blown-in, no mesh
Spray foam
Foam board, SIP, orlCF
Other
(PLEASE SPECIFY)
100%
. 840
. 832
. 833
. 834
. 835
. 836
. 837
. 868
. 838
. 839
. 832r
. 833r
. 834r
. 835r
. 836r
. 837r
. 868r
. 838r
. 839r
12
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CATHEDRAL CEILING INSULATION MATERIAL
What percent of your cathedral / sloped ceilings were insulated
with the following materials, and what was the typical R-value?
% CATHEDRAL
CEILINGS
INSULATED R-VALUE
NOT insulated
Fiberglass batt or blanket
Rockwool batt or blanket
Spray foam
Foam board or SIPs
Other
(PLEASE SPECIFY)
831
827
828
842
829
830
827r
828r
842r
829r
830
100%
SOUND INSULATION
What percent of your homes had insulation in their interior
partition walls and / or floors-between-stories to dampen
sound? ME
SFD SEA BUILDINGS
Homes with wall sound insulation
Homes with floor sound insulation
Of your homes with wall sound insulation, how many linear
feet (LF) of interior partition wall did you insulate in your
typical house or unit?
LF of wall with sound insulation
Of your homes with floor sound insulation, how many square
feet (SF) of floor area did you insulate in your typical house or
unit?
Sq.Ft. of floor with sound insulation
AIR INFILTRATION BARRIERS / HOUSE WRAP
What percent of your homes and multifamily buildings were
wrapped with air infiltration barrier material?
Exclude roofing felt. ME
SFD SEA BUILDINGS
Percent wrapped:
RADIANT BARRIERS
What percent of your houses had radiant barriers in the wall,
roof, or ceiling assembly?
Radiant barrier roof sheathing 857
Other roof/ceiling/attic radiant barrier 857a
Radiant barrier in wall 858
Totals need not add to 100%
. 1008
. 1009
AIR (HVAC) DUCTS
What percent of your houses with ducted HVAC systems had the
main duct and run-outs located in the:
Basement, crawl space or in framed floors only ....
Attic only
Both attic and basement or crawlspace
In or under concrete floor slab
Both in attic and concrete floor slab
100%
AIR DUCT MATERIAL
What percent of your houses with ducted HVAC systems had the
following types of duct material?
MAIN DUCTS
Metal 912
Flexible 9i3
Fiberglass, rigid (foil-faced fiberglass board) 9M
Other 914a
100%
(PLEASE SPECIFY)
RUN-OUT DUCTS
Metal
Flexible
Fiberglass, rigid (foil-faced fiberglass board) 9n
Other 917a
915
916
100%
(PLEASE SPECIFY)
WALL STACKS
Metal gig
Fiberglass, rigid (foil-faced fiberglass board) 9i9
NONE (wall cavity) 920
Other 9203
(PLEASE SPECIFY)
100%
RIGID FIBERGLASS DUCTS
If you used any rigid fiberglass ducts, what was the typical
thickness of the fiberglass board used? (Sone)
linch [ ]i
2 inch [ ]2
Other
(PLEASE SPECIFY)
]3
METAL DUCT INSULATION
If you used any metal duct, what percent of all the metal ducting
was insulated by the following methods, if any?
Lined with insulation (insulation inside the duct) 92i
Wrapped with insulation 922
NOT insulated 924
Other
(PLEASE SPECIFY)
. 923
100%
METAL DUCT WRAP THICKNESS
If you used any duct insulation wrap, what was the typical
thickness? (Sone)
1-1/2 inches or less [ ] i
2 inches [ ]2
More than 2 inches
]3
13
-------
DECKS, PATIOS, PORCHES, & FLATWORK
What percent of your homes had the following structures, and
what was their typical size in square feet?
PERCENT SQ. FT.
Deck (outside)
Patio / Pool deck
Breezeway
Frontporch
Front stoop
Side porch
Screened-in porch
. 931
. 933
. 935
.934
.936
Totals need not add to 100%
PATIO / POOL DECK MATERIAL
What percent of your patios had surfacing material made of:
Poured concrete (include stamped or stenciled)
Concrete pavers
Brick pavers
Tiles
Natural stone
Treated lumber
Other
(PLEASE SPECIFY)
.955
.958
100%
. 959a
DECK AND PORCH MATERIAL
What percent of the decks and porches you built had decking or
surface material made of:
DECKS
PORCHES
Treated wood
Cedar
Redwood
Other untreated wood
Composite (Bex®, CroiceDek® etc) ..
Cellular PVC& other
plastic (Azek®,ete)
. 965
. 966a
. 967
Brick paver
Tiles
Concrete (incl. stamped& stenciled)
Natural stone
.974
. 975c
DECK AND PORCH RAILINGS
What percent of your decks and porches had railings?
Decks % 1121 Porches % 11223
What percent of your deck and porch railings consisted
primarily of the following materials?
DECKS PORCHES
Treatedwood 1193 11991,
Cedar
Redwood
Other untreated wood
Composite (Ttex® ChoiceDek®, etc)
PVC & other plastic
Aluminum
Wrought iron or steel
Masonry or concrete (all types)
Other
1125
1129
1131
1133
1135
1137
1139
1141
1124
1128
1130
1132
1134
1136
1138
1140
(PLEASE SPECIFY)
100%
100%
WALKWAYS & SIDEWALKS
How many linear feet of walkways and
sidewalk did your typical home have?
LF
What percent of all your sidewalks and walkways were:
Poured concrete 977
Concrete paver 978
Asphalt 978a
Brick paver 979
Brick or clay tiles 979a
Natural stone 980
Crushed stone or gravel 98i
Other 982
(PUSASESPECIFY)
100%
Green Homes Built
At No Additional Cost
Over A Standard Home
Move-up
Luxury
Overall
63%
0% 20% 40% 60% 80% 100"-
100%
100%
14
-------
FENCING AND LANDSCAPE WALLS
What percent of your homes or living units had fencing /
privacy walls or landscape /retaining walls installed on the lot
as part of their sales contract?
Fence / Landscape /
Privacy Wall Retaining Wall
SF Detached Houses %987 %998
SF Attached Houses %987a °/°998a
Multifamily Buildings % 987b % 998b
Totals need not add to 100%
For houses with fencing or walls, what was the typical length
offence or wall? (per building ifmultifamily)
Fence / Landscape /
Privacy Wall Retaining Wall
SF Detached Houses LF988 LF999
SF Attached Houses LF988a LF999a
Multifamily Buildings LF 988b LF 999b
Totals need not add to 100%
What was the typical fence /wall height?
Fence / Landscape /
Privacy Wall Retaining Wall
SF Detached Houses FT989 FTIOOO
SF Attached Houses FT989a FT10ooa
Multifamily Buildings FT 989b FT j 00ob
Totals need not add to 100%
FENCING AND LANDSCAPE WALL MATERIAL
What percent of the fences or walls were:
Fence / Landscape /
Privacy Wall Retaining Wall
Wood - vertical boards on
alternating sides
Wood - vertical boards on one side
Wood with horizontal rails / boards
Chain link or wire w/ steel posts
Wire w/wood posts
Wrought iron
Ornamental steel
Aluminum
Plastic & woodfiber composite (Trex, etc.)
Vinyl, PVC, or other plastic
Pre-cast concrete
Poured concrete
Concrete retaining wall
blocks (dry stacked)
Mortared concrete block
Stone
Brick
Treated landscape timbers or lumber
. 990
. 991
. 992
. 993
. 993E
. 993b
. 997d
. 993c
. 993a
. 994
. 997
. 997a
. 997c
. 997b
. 995
. 996
100%
100%
.1003a
. 1003
. 1001
. 1002
. 1006
If you built wood fence/privacy walls, what percent were:
Treated wood
Cedar
Redwood
Other untreated wood
100%
977
978
978a
979
COUNTERTOPS
Indicate the number of cabinets and the linear feet of kitchen
countertop you installed in a typical home.
SFD & SFA MF
Linear feet of Kitchen countertops 545 561
KITCHEN AND VANITY COUNTERTOP MATERIAL
What percent of your kitchen and bathroom vanity countertops
were made of: KITCHEN VANITY
Solid Surface (e.g., Corian®.
Surell®, Swanstone®) 584 590
Laminate (e.g., Formica®.
WilsonArt®) _
Ceramic tile
Cultured marble
Engineered stone or quartz
(Zodiaq®, Silestone®)
Solid wood (butcher block)
Granite
Marble, slate, or other natural stone
Other 589b 595b
. 585 591
. 586 592
. 587 593
. 587a 593a
. 588 594
. 589 594a
. 589a 595a
(PLEASE SPECIFY)
100%
100%
PLUMBING FIXTURES
What was the typical number of plumbing fixtures installed in
each of your homes?
SFD SFD SFD SFA MF
Starter Move-up Luxury Per UNIT Per UNIT
Lavatory sinks
Bathtubs (both standard
and whirlpool)
Separate shower Stalls
Toilets
Bidets
Kitchen sinks ...
Bar sinks
Laundry tubs / sinks.
Other
* * * * *
vl vlO v!9 v28 v37
v2 vll v20 v29 v38
v3 v!2 v21 v30 v39
v4 v!3 v22 v31 v40
v5 v!4 v23 v32 v41
v6 v!5 v24 v33 v42
v7 v!6 v25 v34 v43
v8 v!7 v26 v35 v44
(PLEASE SPECIFY) v9 v!8 v27 v36 v45
KITCHEN SINK TYPE
What percent of your kitchen sinks were:
Drop-in (self-rimming, overmount) V95
Undermount (sub-mount or under-counter) v96
Other
(PLEASE SPECIFY)
100%
15
-------
KITCHEN SINK MATERIAL
What percent of your kitchen sinks installed were:
Stainless steel
Enameled cast iron
Enameled steel (include Americast®)
Cultured marble
Solid-surface (Corian®, Swanstone®, etc.)
Granite / Stone (Moenstone®, Silgranit®,
Kindred Granite®, etc.)
. v58
. v59
. v60
. v61
Acrylic
Other
(PLEASE SPEC1!"; .
v62b
100%
KITCHEN SINK BASINS
What percent of your kitchen sinks had the following number of
basins?
Single basin v90
Double basin v91
Triple basin v92
Other
(PLEASE SPECIFY)
100%
. v93
KITCHEN SINK FAUCETS
What percent of your kitchen sink faucets had the following
control types:
Single control (handle or lever) v2,
Two controls (one for hot and one for cold) V2>
100%
What percent of your kitchen sink faucets had the following
finishes:
Chrome
Brass / Gold
Bronze (oil rubbed, polished, brushed, etc.)
Solid color (almond, white, black, biscuit, etc.)
Nickel
Stainless steel
Other
(PLEASE SPECIFY)
. v203
. v204
100%
. v207
. v208
. v209
LAVATORY SINK TYPE
What percent of the lavatory sinks you installed were:
One-piece sink and countertop
Drop-in (self-rimming, overmount)
Wall-hung
Pedestal
Undermount (sub-mount or under-counter)
Vessel
. v46
. v47
. v48
. v50
. v49
. v49a
100%
LAVATORY SINK MATERIAL
What percent of all the lavatory sinks you installed were:
Vitreous china (ceramic) vsi
Enameled cast iron v52
Enameled steel (include Americast®) V53
Cultured marble V54
Coated fiberglass V55
Acrylic v56
Solid-surface (Corian®, Swanstone®, etc.) V57
Other v57a
(PLEASE SPECIFY)
100%
LAVATORY SINK FAUCETS
What percent of your lavatory sink faucets had the following
control types:
Single control (handle or lever) v2n
Two controls (one for hot and one for cold) V2i2
100%
What percent of your lavatory sink faucets had the following
finishes:
Chrome
Brass/Gold
Bronze (oil rubbed, polished, brushed, etc.)
Solid color (almond, white, black, biscuit, etc.)
Nickel
Stainless steel
Other
(PLEASE SPECIFY)
100%
. v213
. v214
. v215
. v216
.¥217
. v218
. v219
Average Cost Increase
For Green Home
Over Standard Home
Starter
Mow-ill
Luxury
Overall
S9,00D
SO $2,000 54.000 S6.000 58,000 510,000
16
-------
BATHTUBS (NON-WHIRLPOOL)
What percent of all the non-whirlpool bathtubs you installed were:
Tub / Shower Combination
Coated fiberglass, one-piece
Coated fiberglass, multi-piece
Acrylic, one-piece
Acrylic, multi-piece
Other
(PLEASE SPECIFY)
Tub only
Enameled cast iron
Enameled steel
Cultured marble
Coated fiberglass
Acrylic ..
. v63
v63m
. v64
. v64m
v64a
. v65
. v66
. v67
. v68
. v69
Solid-surface (e.g., Swanstone®, Avonite®' etc.) V7o
Other v70a
(PLEASE SPECIFY)
100%
WHIRLPOOL BATHTUBS
What percent of your homes had whirlpool baths?
SFD SFD SFD SFA MF
Starter Move-up Luxury Units Units
* * » » *
Whiripool bathtubs
v2w
v20w
v38w
What percent of all the whirlpool baths you installed were:
Tub / Shower Combination
Coated fiberglass, one-piece ...
Coated fiberglass, multi-piece
Acrylic, one-piece
Acrylic, multi-piece
Other
(PLEASE SPECIFY)
Tub only
Enameled cast iron
Enameled steel
Cultured marble
Coated fiberglass
Acrylic ..
. v63w
v63wm
. v64w
. v64wm
v64aw
. v65w
v66w
v67w
. v68w
. v69w
Solid-surface (e.g., Swanstone", Avonite"' etc.) V70w
Other v70aw
(PLEASE SPECIFY)
100%
TUB / SHOWER DOORS
What percent of the tubs, showers, and whirlpool baths you
installed had shower doors?
Bathtubs (non-whirlpool)
Showers
Whirlpool baths
. v231
Totals need not add to 100%
BATHTUB AND WHIRLPOOL SURROUNDS
What percent of the separate bathtubs and whirlpool baths
installed had site-constructed surrounds of the following
materials?
you
NO separate bathtub surrounds were constructed
Ceramic tile
Marble, slate, or other natural stone
Solid surface (e.g., Corian®, Avonite®, etc.) ....
Laminate (e.g., Formica, Wilsonart)
Fiberglass / Plastic
Cultured marble
Other
%v76
% v71
o/
/O V71a
%v72
% v73
%v73a
% v74
%v75
(PLEASE SPECIFY)
100%
SEPARATE SHOWER STALLS
What percent of all the shower stalls you installed were:
Fabricated on-site from:
Ceramic tile
Marble, slate, or other natural stone
Solid surface (e.g., Corian®, Avonite®, etc.)...
Laminate (eg, Formica®, Wilsonart*)
Cultured marble
Other
(PLEASE SPECIFY)
Manufactured units of:
Coated fiberglass, one-piece
Coated fiberglass, multi-piece
Acrylic, one-piece
Acrylic, multi-piece
Other
. v77
. v79
(PLEASE SPECIFY)
. v82
v82m
. v83
. v83m
. v84
100%
SHOWER BASES
What percent of the fabricated on-site showers you installed
had manufactured bases or pans? v256
BATHTUB / SHOWER FAUCETS
What percent of your bathtub / shower faucets used the
following control types:
Single control, pulled or lifted to turn on water v22
Single control, twisted to turn on water v22:
Two controls (one for hot and one for cold)... v22:
100%
What percent of your bathtub / shower faucets had the following
finishes:
Chrome V224
Brass/Gold V225
Bronze (oil rubbed, polished, brushed, etc.) V226
Solid color (almond, white, black, biscuit, etc.) . V227
Nickel
Stainless steel
Other
(PLEASE SPECIFY)
. v228
. v229
. v230
100%
17
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STEAM GENERATORS
What percent of all the tubs, showers, and whirlpool baths you
installed had Steam Generators?
Bathtubs V234
Showers
Whirlpools
. v235
SHOWERHEADS
What percent of the bathtubs and showers you installed had
showerheads of the following types:
Standard / Fixed showerhead V249
Hand-held showerhead V2so
Massaging showerhead V25i
Thermostatic valves v252
Body sprays v253
Steam head v254
Other v255
(PLEASE SPECIFY)
What percent of the bathtubs and showers you installed had the
following:
More than 1 Standard showerhead V257
More than 1 Hand-held showerhead V258
Totals need not add to 100%
TOILETS
What percent of the toilets installed in your new homes were:
One piece (bowl and tank are one casting) v85j
Two piece
100%
What percent of the toilets had the following bowl styles?
Elongated .... v85_3
Standard v85_4
100%
What percent of your toilets were dual flush?
Percent of toilets with Dual Flush v85_5
TOILET BRANDS
Of all the toilets you installed last year, what percent were the
following brands?
Percent
American Standard vss
Briggs v85a
Crane v85b
Eljer... V85c
Gerber v86
Kohler v86a
Mansfield vsa
Sterling... v86c
Toto ... v87
Universal-Rundle
St. Thomas Creations
Other
(PLEASE SPECIFY)
. v87a
. v87b
. v87c
100%
MOUNTED BATH ACCESSORIES
How many of the following are installed in your typical
bathroom?
Towel bar
Towel ring
Robe hook
Toilet paper holder
Toothbrush and/or Tumbler holder
Shelf _
Soapdish
Grab bars....
. v241
. v242
. v243
. v244
. v245
. v246
. v247
. v248
APPLIANCES
RANGES, COOKTOPS & OVENS
What percent of your homes were equipped with ranges or
cooktops and ovens that were: MF
Freestanding
Slide-in ...
Drop-in
Cooktop & wall oven(s)
NO range / cooktop / oven
SFD SFA UNITS
al a6 all
. a2
a!2
100% 100% 100%
WALL OVEN CONFIGURATION
What percent of your new homes with built-in wall ovens had:
A single wall oven 334
Two separate wall ovens 335
Stacked double ovens in a single unit &6
100%
BURNER TYPE
What percent of the cooking appliances you installed had the
following types of burners? RANGES COOKTOPS
Electric
Halogen burner / smoothtop a22 a28
Smoothtop, not halogen a23 a2g
Conventional heat coils a24 a30
Modular units for grill a25 a31
Gas
Sealed gas burners a26 a32
Conventional gas a27 a33
100% 100%
FUEL TYPE
What percent of the equipment you installed used the following
fuel types? WALL WATER
RANGES COOKTOPS OVENS HEATERS
Gas
Electric
Oil ..
a!6
a!7
a!8
a!9
a!8a
a!9a
100%
100%
100%
100%
18
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. a58
. a58a
. a59
a62 a66
a62a a66a
a63 a67
MICROWAVE OVENS
What percent of your homes were equipped with microwave
ovens that were:
SFD SFA MF UNITS
Built-in with range
Built into cabinet
Over-the-range
Countertop or hung
under cabinets a60 M aes
Top unit of double wall
OVen a60a 364a a68a
NO microwave oven a6i a65 a69
100% 100% 100%
REFRIGERATORS/FREEZERS
What percent of your homes were equipped with refrigerators
that were:
SFD SFA MF UNITS
Freezer on top,
refrigerator below a70 a74 avs
Refrigerator on top,
freezerbelow avi 375 379
Side-by-side
refrigerator / freezer a72 a76 a8o
Refrigerator with no
freezer a72a a76a a8oa
NO refrigerator a73 a77 a81
100% 100% 100%
DISHWASHERS
What percent of your homes were equipped with:
SFD
SFA MF UNITS
Dishwashers with
timing cycles
Dishwashers with
cleaning sensors
NO dishwasher
aS7
. a89
. a90
100% 100% 100%
Ranking Of Conditions
That Need To Be Met For
Builders To Go "Green"
Rank Condition Met
1 Homes Cost the Same or Only Slightly More to Build
2 Homebuyers Will Pay More for a Green Home
3 Green Allows Flexibility in Home Design, Features
4 Green Homes are Easier to Sell
5 No Extensive TrainingoF Subs, Vendors
6 "Green" Gives Me a Competitive Advantage
7 I Find the Right "Green" Building Program
8 Green Homes Become Easy to Build
9 My Competitors Do It
10 Preferential Treatment by Codes for "Green" practices
11 Green Homes are Higher in Quality
CLOTHES WASHERS
What percent of your homes were equipped with clothes
washers that were:
SFD SFA MF UNITS
Top loading
washing machine a91 a94 a97
Front loading
washing machine a92 a9s a9s
NO washing machine a93 a96 a99
100%
100%
100%
CLOTHES DRYERS
What percent of your homes were equipped with clothes dryers
that were:
SFD SFA MF UNITS
Electric dryer al0o aios aioe
Gas powered dryer al m ai 04 ai 07
NO clothes dryer al02 aios aios
100%
100%
100%
. al!7
. allS
. al!9
. a!21
. a!22
. a!23
a!24
OTHER APPLIANCES & HOME FEATURES
What percent of your homes were equipped with the following
appliances? MF
SFD SFA UNITS
Garbage disposal an3
Trash compactor all4
Hot water dispenser al j 5
Central vacuum -
full system all6
Central vacuum -
pre-pipe only
Elevator
Standby generator
Water softener
Hot water recirculation
piping al47b al48b al49b
Code required fire
sprinkler system al47d al48d al49d
Non-code required fire
sprinkler system al47c al48c al49c
a!41
a!44
a!47
a!47a
a!42
a!45
a!48
a!48a
a!43
a!46
a!49
a!49a
Totals need not add to 100%
FIRE SPRINKLER SYSTEMS (Skip if none installed)
What percent of your fire sprinkler piping was:
SFD & SFA MF
CPVC
PEX
Steel/Iron
Copper
Other
(PLEASE SPECIFY)
. si 01
. si 02
. s!03
. s!04
. si 05
100%
What percent of your fire sprinkler systems were:
SFD & SFA
Stand-alone fire
sprinkler systems sm
Combined plumbing and fire
sprinkler systems Sn2
100%
100%
MF
. sioe
. s!07
. s!08
. s!09
. sllO
. sl!4
100%
19
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WATER PIPES
What percent of your homes' water service (from the street to
the house); distribution (hot/cold water plumbing within the
house); waste & vent (DWV piping that drains water from the
sinks, toilets, etc) pipe was the following types:
WATER WASTE
SERVICE DISTRIBUTION & VENT
Copper
PVC or CPVC
Polyethylene (PE) ..
PEXorPEX-AL-PEX
Steel / Cast iron
ABS...
v210s
v211s
v212s
v213s
v215s
v210d v210w
v211d v211w
v213d
v21 5w
v216w
100%
100%
100%
If you used PEX plumbing systems, what percent of the piping,
fittings, and manifolds were the following brands:
Bow
IPEX
JM Eagle
NIBCO ...
Rehau
Sioux Chief
Uponor
Viega
Watts
Zurn
Don'tknow
Other
PIPING FITTINGS MANIFOLDS
v217p v217f v217m
v218p v218f v218m
v219p v219f v219m
v220p v220f v22Qm
v221p v221f v221m
v222f v222m
v223p v223f v223m
v224p v224f v224m
v225p v225f v225m
v226p v226f v226m
v227p v227f v227m
v228p v228f v228m
100%
100%
100%
What percent of the PEX plumbing systems you installed were:
SFD SFD SFD SFA MF
Starter Move-up Luxury Units Units
* * » » *
Trunk & Branch
Home Run
Zone (remote
manifold)
Other...
Don'tknow
100% 100% 100% 100% 100%
v229s v229m v2291 v229t v229a
What percent of the fittings for your PEX plumbing systems were:
SFD SFD SFD SFA MF
Starter Move-up Luxury Units Units
Engineeredplastic
Copper/Brass
Other...
Don'tknow
100% 100%
v230s v230m
100%
V2301
100% 100%
v230t v230a
CONFIGURATION OF HVAC SYSTEMS
What percent of your homes (or multifamily units) had the
following primary heating systems:
Standard heat pump w/ electric backup heat hi 01
Standard heat pump w/ gas or propane backup hl02
Geothermal heat pump
Gas or propane furnace or boiler
Oil furnace or boiler
Electric furnace, baseboard, or radiant
No primary heating system
hi 03
hi 04
hi 05
hi 06
hi 07
100%
HEATING DISTRIBUTION SYSTEMS
What percent of your homes with primary heating systems had
the following heating distribution systems:
Ductless Heat Pump
Forced Air—one zone only
Forced Air—two or more zones
Hydronic—radiant floor
Hydronic—baseboard or radiators
Other type of distribution system
hill
hl!2
hl!3
hl!4
hl!5
hl!6
100%
AIR CONDITIONING SYSTEMS
What percent of your homes had the following types of air
conditioning systems:
No air conditioning system installed
Evaporative cooler
Single ACunit
Two or more AC units
Ductless heat pump or AC
. h!21
. h!22
.hi 23
. h!24
. h!25
100%
HVAC SYSTEM FEATURES
What percent of your homes had the following as part of their
HVAC systems:
High performance air cleaner (HEPA, electronic) hisi
Humidifier
Heat Recovery Ventilators (HRV, ERV)
Non-energy-recovery fresh air exchangers
hi 32
hi 33
hi 34
Total need not add to 100%
EFFICIENCY RATINGS OF WARM AIR FURNACES
Of all the furnaces installed in the homes your firm built, what
percent had efficiency ratings of:
Less than 78% hl41
78% to 79.9% ... hl42
80% to 89.9% ... hl43
90% to 95%... hl44
95.1% or greater U45
Don'tknow hi 46
100%
20
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AIR CONDITIONER EFFICIENCY
What percent of air conditioning systems and heat pumps
installed in your home had SEER ratings of:
Less than 13
13.0 to 14.9
15.0 to 16.9
17.0 to 18.9
19.0 to 20.9
21 or higher
Don't know
. h!53
100%
PRACTICES REGARDING RADON GAS
Please answer these questions even if you used NO radon-
reducing practices.
SUB-SLAB OR SUB-MEMBRANE VENTILATION
What percent of the houses you built had the following types of
ventilation systems to reduce radon:
BASEMENTS CRAWL
OR SLABS SPACES
NO venting installed to reduce radon
A rough-in for ventilation (not a
complete system, e.g., capped
pipe riser in basement)
Passive stack ventilation
Fan-driven (active) depressurization
Foundation wall vents ..
.791
795
.789
. 790
100%
100%
SEALING METHODS OF HOUSES
WITH SLAB OR BASEMENT FOUNDATIONS
How do you seal your slabs? If you don't seal, «^ "NO slab
sealing method used."
(^all that apply)
NO slab sealing method used [ ] 803
Polyethylene or other membrane under slab [ ] 796
Membrane on foundation walls below grade [ ] 797
Caulk around slab, wall openings and slab joints [ ] 798
Seal interior of foundation walls [ ] 799
Locate sump access outside of basement [ ] 800
Install air tight sump pit covers [ ] 8M
Other [ ]802
(PLEASE SPECIFY)
RADON TESTING
What percent of your homes were tested for radon? %
804
Of the houses tested for radon, what percent needed further
work to reduce radon to less than 4pCi/L? %
PASSIVE vs. ACTIVE SUBSLAB VENTILATION
If you installed PASSIVE sub-slab or sub-membrane ventilation
(without a fan), what was the typical cost for you to include
these features per home? (
Less than $200
$200 to $299 ..
$300 to $399 ..
$400 to $499 ..
$500 to $599 ..
$600 to $799 ..
$800 or more ..
vl!4
If you installed ACTIVE sub-slab or sub -membrane ventilation
(with a fan), what was the typical cost for you to include these
features per home?
Less than $450 [ ]1
$450 to $549 .. [ ]2
$550 to $649 .. [ ]3
$650 to $749 .. [ ]4
$750 to $849 .. [ ]5
$850 to $1049 ]6
$1050 or more
[ ]7
v!20
INFRASTRUCTURE
What percent of your single family detached dwellings were
located:
SFD
In residential developments
Not in residential developments
100%
. h201
. h202
What percent of your homes & multifamily buildings located in
residential developments had frontage on the following:
SFD " SEA & ME
Concrete streets
Asphalt streets
Other:
(PLEASE SPECIFY)
100%
. h203
. h204
. h205
100%
. h206
. h207
. h208
What percent of your homes and multifamily buildings located
in residential developments were on streets with the following:
SFD SEA & MF
Sidewalks
Curbs and gutters
Curbs only, no gutters
Gutters only, no curbs
No curbs or gutters
. h209
. h210
. h211
. h212
. h213
. h214
. h215
. h216
. h217
. h218
Total need not add to 100%
21
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STANDBY GENERATORS
What percent of your standby generators were:
Natural gas
Propane/LP gas
Gasoline
Diesel
Other
100%
. g!09
-gHO
What percent of your standby generators were:
Not permanently installed (portable)
Permanently installed 7kW to 20kW
Permanently installed over 20kW
-gH4
-gH5
-gH6
100%
What percent of your standby generator installations included:
Manual transfer switch gll4a
Automatic transfer switch
100%
.gllSa
UPDATES
Would you like to receive periodic communications on NAHB
Research Center testing results and programs via e-mail?
No [ ] j Yes [ ] 2 aieo
(PLEASE SPECIFY E-MAIL ADDRESS)
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Thank You for Your Time and Cooperation!
Comments or questions? Contact Joanne McAlpin atjmcalpin@nahbrc.com or 1-800-638-8556 ext. 6306.
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