-------
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
2010 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 2010, NAHB Research Center, Inc.
SAMPLE SIZE ®
Units ®
Builders ®
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
©NEWENG
281
91
3.1
FEATURES
©
2.4%
15.4%
0.0%
0.8%
0.8%
2.1%
® MID ATL
674
117
5.9
©
16.6%
9.6%
4.3%
0.5%
3.4%
0.6%
® E N CEN
915
198
4.6
©
19.6%
26.9%
1 .6%
4.7%
2.3%
7.8%
Houses on piers ®
TOTAL ®
1.6%
©100.0%
0.0%
©100.0%
0.0%
©100.0%
Figure 2: Sample of the Radon Coefficient Tables
NAHB Research Center, Inc.
Page 6
-------
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 2010. 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 49.5 percent of all single-family detached (SFD) starts
in the Mid-Atlantic States in 2010; and new SFD home starts in Mid-Atlantic were 7.7 percent of
total U.S. SFD starts. Consequently, the Pennsylvania average has a weight of 3.8 percent when
developing U.S. total averages (49.5% x 7.7% = 3.8%).
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.
NAHB Research Center, Inc. Page 7
-------
BUILDER PRACTICES REPORT
Radon-Resistant Construction Practices
DEMOGRAPHIC SAMPLING
The complete Annual Builder Practices Survey respondent database for 2010 includes 1,278
builders who constructed 7,294 SFD homes, and 166 builders of 4,271 multifamily units.
Builders in the sample ranged from those who constructed a single-home in 2010 to national
companies whose combined regional and local offices built thousands of homes in 2010.
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 2010, 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 0 Sample Percent of 201 0 Starts
New England
Mid-Atlantic
East North Central
West North Central
South Atlantic
East South Central
West South Central
Mountain
Pacific
United States Total
3.9%
9.2%
12.5%
9.3%
16.0%
5.6%
18.1%
8.6%
16.8%
100.0%
3.4%
7.7%
9.5%
7.3%
25.6%
6.9%
19.8%
9.3%
10.5%
100.0%
Table 2: Annual Builder Practices Survey Distribution of All Responses by Census Division
NAHB Research Center, Inc.
Page 8
-------
BUILDER PRACTICES REPORT
Radon-Resistant Construction Practices
BUILDERS AND THEIR HOMES
AVERAGE UNITS PER BUILDER IN 2010
In 2010, the average number of homes constructed by single-family detached (SFD) builders in
the entire survey sample was about 6.9. In 2008 and 2009, the averages were 7.7 and 8.5
homes per respondent.
The average single-family attached/multifamily builder in the sample constructed 28.9 units,
which is up again after the drop in 2009 to 24.1 units (30.8 units was the average reported in
2008).
PRICE DISTRIBUTION OF SINGLE-FAMILY DETACHED HOMES IN 2010
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 2008, 2009, and 2010.
Price Distribution of Single Family Detached Homes
Luxury
Move-
Up
Starter
O.C
I 14.6%
16.
7%
I 22.9%
02010
• 2009
D2008
| 47.4%
| 41.9%
40.2%
| 38.0%
41 .4%
I 36.
% 10.
9%
0% 20.0% 30.0% 40.0% 50.
0%
Figure 3: Distribution of New Single-family Detached Homes by Price-Point, 2008 to 2010
The Single-family Detached homes price distribution in 2010 saw a continued decline in the
share of new luxury homes. The decline in starter homes can be attributed to ending of the first-
time home buyer tax credit in 2010, which favored the low end of the market.
NAHB Research Center, Inc.
Page 9
-------
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 2010 was 2,249 square feet, about the same as the
average reported in 2009 (2,235 square feet) and, once again, down from the average in 2008
(2,465 square feet). This decrease can be attributed to the continued decrease in luxury home
starts since 2008 and the higher number of both starter and move-up starts.
Figure 4 shows the results for all three years by starter, move-up, and luxury home categories.
Average Size of Single Family Detached Homes
L uxury
Move-Up
Starter
I"
3,71
36
3
1 4,039
1,550
1,550
1,535
2,2
2,
I
91
S03
!,392
500
1000
1500
2000
2500
3000
3500
4000
4500
Figure 4: Average Size of Single-family Detached Homes by Price-Point, 2008 to 2010
NAHB Research Center, Inc.
Page 10
-------
BUILDER PRACTICES REPORT
Radon-Resistant Construction Practices
AVERAGE PRICE OF NEW HOMES
In 2010, a new single-family detached home (including land) averaged $323,061. In 2009 the
average price of a new single-family detached home was $301,607, and in 2008 it was $356,428.
These averages are indicative of the impact of the downturn in the housing industry. Home values
on average continued their precipitous fall into 2009 and have stabilized somewhat since then and
rebounded in areas where home building activity is greatest. Luxury home prices rose significantly
in the past year; move-up and starter home prices increased as well but not to the same extent.
Figure 5 gives average prices for starter, move-up, and luxury homes, for the past three years.
Average Price of Single Family Detached Homes
Luxury
Mov e-U p
Starter
I
| $165,664
f $161,089
T $157,030
$292,454
$283,859
I $309,167
| $6E
~| $721,487
3,364
| $749,
02010
02009
• 2008
$100,000
$300,000
$500, 000
$700,000
Figure 5: Average Price of Single-family Detached Homes by Price-Point, 2008 to 2010
NAHB Research Center, Inc.
Page 11
-------
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.
NAHB Research Center, Inc. Page 12
-------
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 2010, the share of one story homes continued to represent more than half of all new
homes, yet lower than in the past couple of years. The likely cause for the decline is that the
housing industry decline has affected states like Florida and the Southwest—where single-story
homes are the norm—more severely than areas where 2-story homes are the norm.
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
I 53.;
I 54
I 44.7%
I 43.8%
I
1 2.1%
1 1.4%
| 1.8%
J7.9%
%
8%
60.3%
02010
D2009
• 2008
)% 20.0% 40.0% 60.0% 80.0%
Figure 6: Design of Single-family Detached Homes Built from 2008 to 2010
Two-story homes built in 2010 again were most popular in New England and Mid-Atlantic
Census Divisions with 75.9 percent and 63.3 percent of all new single-family detached homes
respectively. In 2009, these numbers were 60.0 percent and 68.0 percent respectively.
In 2010, new single-family two-story homes were least common in the East South Central states
at 21.5 percent, changing little from the 19.8 percent reported in 2009.
NAHB Research Center, Inc.
Page 13
-------
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 2010, the average multifamily dwelling had 1,281 square feet of
finished space with an average selling price of $216, 870 (including land). Both numbers are up
from those reported in 2009—1,232 square feet of finished space, on average, with a selling price
of $182,677.
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 2010,
one-story townhouses accounted for 38.1 percent, two-story townhouses for 49.1 percent, three-
story townhouses for 11.6 percent, and four-story townhouses for 1.2 percent. Compared to 2009,
these numbers indicate a rise in one- and three-story townhouses (32.9 percent and 5.2 percent,
respectively, in 2009) and a drop in two-story townhouses from the 54.2 percent.
NAHB Research Center, Inc. Page 14
-------
BUILDER PRACTICES REPORT
Radon-Resistant Construction Practices
FOUNDATION TYPES
Foundation types in the radon samples are shown in Figure 7 below for 2008 through 2010. 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
M1.6%
1.2%
1.9%
Slabs
Crawl Spaces
Basements
49.8%
53.2%
45.3%
10.5%
10.5%
.3%
35.5'
8.2%
Q2010
n2009
•2008
0.0% 10.0% 20.0% 30.0% 40.0%
Percent ofshgle family detached homes in radon sample
50.0%
60.0%
Figure 7: Foundation Types in Single-family Detached Homes Built from 2008 to 2010
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, 56.3 percent of single-family detached dwellings with
basements built in 2010 were two- or three-story homes, compared to 52.4 percent in both 2009
and 2008. 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 2010
about 26.9 percent of all new U.S. single-family detached homes were built in Zone 1, 29.9
percent in Zone 2, and 43.2 percent in Zone 3. The breakdown by foundation types shows that
81.2 percent of single-family detached homes built in 2010 in Zone 1 had basements. This is
compared to 75.9 percent in 2009 and 78.5 percent in 2008. In contrast, only 6.2 percent of
single-family detached homes built in Zone 3 had basements compared to 9.5 percent in 2009
and 7.6 percent in 2008.
Of all single-family detached homes built in Zone 1 in 2010, 10.8 percent had concrete slab
foundations. In comparison, slab foundations accounted for 13.0 percent in 2009 and 8.7
percent in 2008. In Zone 3, 86.2 percent of all single-family detached homes built in 2010 had
concrete slab foundations compared to 81.7 percent in 2009 and 77.2 percent in 2008.
NAHB Research Center, Inc.
Page 15
-------
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 2010, 16.6 percent of all new single-family detached homes, excluding those on piers, included
a radon-reduction system. In 2009, this number was 13.7 percent, and was 12.2 percent in 2008.
These figures reflect a continued trend of increased usage of radon-resistive new construction
practices.
Installation of radon-reducing features in multifamily buildings in 2010 was 15.2 percent, up from
10.6 percent in 2009 and even 12.7 percent in 2008. This continues the long-term trend of flat to
upward movement in radon-reducing feature installation in multifamily new 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 2008, 2009, and 2010.
Overall, the average size of builder, measured by annual housing starts, has declined somewhat
over the past year, reflecting a downturn in new housing construction activity.
Size of Builder of Single Family Detached Homes
Over
100
26 to
100
11 to 25
1 to 10
19.7%
23.7
• 1 21%
25
2
| 22%
13.2'
13.4
14°/<
/o
/o
%
3%
3.8%
41.8°/<
3£
,1%
43%
D2010
• 2009
• 2008
0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
Percent of single family detached homes in sample
Figure 8: Composition of Radon Sample by Homes per Builder per Year, 2008 to 2010
NAHB Research Center, Inc.
Page 16
-------
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.
EEHi^^^l
2010
2009
2008
53.5%
44.1%
50.7 %
11 to 25 26 to 100
15.3%
11.8%
12.1%
20.3%
21 .4%
22.9%
Over 100
11.0%
22.7%
14.3%
Table 3: Composition of Zone 1 Sample by Size of Builder
Builders in Zone 1 Using Radon-Reducing Features
Over
100
26 to
100
11 to
25
to 10
0.0%
I 14.4%
I 12.5%
I
I 15.6'
1 13.0%
I 27
I 26.f
19.7%
I 23.4%
&
.7%
'%
I 44.1%
^^^^^^^B
50.1%
• 52.9%
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.
Small builders continue to add the largest share of homes with radon-resistant features than any
other group. In 2010, the greatest boost to the composition of homes with radon-reduction features
came from mid-sized homes. The absence of homes in this subsample by 100 unit+ builders is
partially due to the fewer number of builders who are producing more than 100 homes per year.
NAHB Research Center, Inc.
Page 17
-------
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 2010, this study showed that 16.8 percent of new single-family homes had radon-reducing
features, up from 13.7 percent in 2009. Passive stack depressurization systems in U.S. single-
family detached homes in 2010 had a reported usage rate of 15.3 percent. This is an increase
from reported usage rates in 2009 of 11.1 percent and 10.0 percent in 2008. Fan-driven sub-
slab depressurization or ventilation of single-family detached homes built in 2010 was 1.5
percent, down from rates of 2.6 percent in 2009 and 2.2 percent reported in 2008.
While not included in the total share of homes with radon-reducing features, roughed-in systems
were found in 5.3 percent of the single-family detached houses in the 2010 radon sample of
homes with a basement or slab, the same share reported in 2009.
Radon-reducing features continue to be more prevalent in single-family detached homes with
basements than with any other type of foundation. In 2010, 34.8 percent of single-family homes
with basements were reported to have radon-reducing features, compared to 13.7 percent of
homes built on crawlspace foundations and 3.7 percent built on concrete slab foundations. Further,
31.6 percent of single-family detached homes with basements reported having passive stack sub-
slab ventilation installed; fan-driven sub-slab depressurization was installed in 3.1 percent of
homes with basements. In single-family detached homes built on concrete slab foundations,
passive and active systems were installed at rates of 3.6 percent and 0.1 percent, respectively.
Rough-ins for sub-slab ventilation were installed in 12.1 percent of single-family detached homes
with basements and in 1.2 percent of single-family detached homes built on slabs in 2010.
NAHB Research Center, Inc. Page 18
-------
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-Reducing Features in Single Family Detached Houses by Census Division
West South Central
East South Central
West North Central
East North Central
New England
J 7-
J 1
8.2%
] 26.:
] 27
D2010
• 2009
• 2008
0% 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 2010, shares of new single-family homes (excluding those on pier
foundations) with radon-resistant features in Zones 1, 2 and 3 were 40.1, 17.9 and 2.1 percent,
respectively. This correlates well with 2009 survey results, where shares of single-family detached
homes with radon-reducing features in Zones 1, 2 and 3 were 36.2, 16.8, and 1.2 percent,
respectively.
1 Zone assignment is based on the county where builder constructed most of their homes.
NAHB Research Center, Inc.
Page 19
-------
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 15.3 percent in 2010 compared to 10.7 percent in 2009. Like single-family
homes, multifamily homes in zones with higher likelihood of exposure were more likely to have
radon-resistant features. In 2010 the share of units in Zone 1 with radon-resistant features was
18.9 percent; in Zone 2, the rate was 16.0 percent; and, in Zone 3, the rate was 1.9 percent. This
corresponds fairly well to the survey results of 2009, where the share of units in Zones 1, 2 and 3
were 15.0, 14.2, and 1.7 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 2010, four inches or more of aggregate
was used in 52.6 percent of the single-family detached homes with basements or slabs. This
compares to 46.1 percent in 2009 and 51.1 percent in 2008.
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 71.1 percent, compared to 62.8 percent in Zone 2 and 35.7 percent in Zone 3. This
relationship held true for the years 2009 and 2008 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 52.8 percent in 2010, up from 35.6 percent in 2009 and also up from
31.4 percent in 2008.
In single-family detached homes with slabs, 42.7 percent used a polyethylene or other membrane
under the concrete slab to seal the slab against radon. In 2009, 35.7 percent used this method and
29.4 percent used this method in 2008. 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 70.9 percent
of the sample. This compares to 54.1 percent and 61.9 percent in 2009 and 2008 respectively.
NAHB Research Center, Inc. Page 20
-------
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 2010, 13.4 percent of the single-family detached houses with basements were sealed with
caulking. This is compared to 8.3 percent in 2009 and 9.5 percent in 2008. These results indicate a
jump after what seemed to be a period of declining popularity for this practice.
In houses on slabs, 7.9 percent of the single-family detached houses on slabs used caulking as a
sealing method. This is up from the 4.9 percent reported in 2009 but still down from the 11.2
percent reported in 2008.
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 2010 sample, 40.4
percent of single-family detached homes with basements in Zone 1 were sealed with
polyethylene or another membrane under the basement, as were 38.3 percent in Zone 2, and
45.1 percent in Zone 3.
In 2010, among single-family detached houses with slabs, membranes were used in 47.3
percent of homes Zone 1, 45.9 percent in Zone 2, and 31.4 percent in Zone 3. This compares to
the sample in 2009 where 31.7 percent in Zone 1, 36.7 percent in Zone 2, and 28.1 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 2010, the average installation cost for a passive system
in a single-family detached home was approximately $297. This cost has remained about the
same over the past several years, comparing to $290 in 2009, $295 in 2008, and $249 in 2007.
The average cost of an active radon-reduction system in new SFD homes in 2010 was $662,
which represents an increase in the cost of fan-driven systems following the steady cost decline
over previous years. This compares to an average of $618 in 2009, $644 in 2008, and $682 in
2007.
NAHB Research Center, Inc. Page 21
-------
APPENDICES
-------
APPENDIX A
SINGLE-FAMILY DETACHED
USAGE COEFFICIENT TABLES
BY THE NINE CENSUS DIVISIONS
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE1
SAMPLE SIZE
Units
Builders
W3HTD AVERAGE UNITS PER BLDR
NEW ENG
281
91
3.1
Ml D ATL
674
117
5.9
ENCEN
915
198
4.6
W N CEN
676
158
4.5
SAIL
1168
249
4.9
ESCEN
410
72
5.5
W S CEN
1318
121
12.7
MTN
626
116
6.1
PAC
1226
156
8.7
US TOTAL I
7294
1278
6.9
TYPE OF HOUSE: WITH RADON REDUCI NG FEATURES
One Story Dwellings With Basements
Wth radon reducing features
No radon reducing features
One story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
One Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATI ON -- EXCEPT R ERS
Basements
Wth radon reducing features
No radon reducing features
Crawl Spaces
Wth radon reducing features
No radon reducing features
Sabs on Grade
Wth radon reducing features
No radon reducing features
TOTAL
ALL DWELLI NGS -- EXCEPT ON R ERS
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
2.4%
15.4%
0.0%
0.8%
0.8%
2.1%
14.2%
58.4%
0.0%
1.1%
0.4%
1.7%
0.4%
0.7%
0.0%
0.0%
0.0%
0.0%
1.6%
100.0%
17.3%
75.8%
0.0%
1.9%
1.2%
3.8%
100.0%
18.5%
81.5%
100.0%
16.6%
9.6%
4.3%
0.5%
3.4%
0.6%
24.0%
37.2%
0.5%
0.4%
0.4%
0.0%
0.0%
2.4%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
40.6%
49.3%
4.8%
1.0%
3.9%
0.6%
100.0%
49.2%
50.8%
100.0%
19.6%
26.9%
1.6%
4.7%
2.3%
7.8%
10.4%
22.8%
0.0%
1.7%
0.8%
0.9%
0.0%
0.5%
0.0%
0.0%
0.0%
0.1%
0.0%
100.0%
30.0%
50.1%
1.6%
6.4%
3.1%
8.8%
100.0%
34.7%
65.3%
100.0%
30.5%
33.2%
0.5%
1.2%
1.1%
1.5%
8.2%
22.9%
0.0%
0.1%
0.2%
0.4%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
38.8%
56.1%
0.5%
1.3%
1.3%
2.0%
100.0%
40.6%
59.4%
100.0%
0.8%
4.8%
0.2%
6.0%
0.3%
27.3%
11.2%
10.1%
0.3%
7.4%
1.5%
23.7%
0.3%
0.7%
0.0%
0.2%
0.0%
2.8%
2.4%
100.0%
12.5%
15.9%
0.5%
14.0%
1.8%
55.3%
100.0%
14.8%
85.2%
100.0%
3.7%
10.1%
3.9%
9.2%
4.4%
46.2%
1.4%
5.3%
0.1%
4.1%
0.0%
9.5%
0.2%
0.0%
0.1%
0.0%
0.0%
0.0%
1.7%
100.0%
5.5%
15.6%
4.1%
13.4%
4.5%
57.0%
100.0%
14.1%
85.9%
100.0%
0.0%
0.3%
0.0%
0.3%
0.3%
62.7%
0.1%
0.3%
0.0%
0.3%
0.9%
32.7%
0.1%
0.0%
0.0%
0.0%
0.0%
0.3%
1.7%
100.0%
0.1%
0.6%
0.0%
0.5%
1.2%
97.5%
100.0%
1.3%
98.7%
100.0%
1.4%
20.4%
1.1%
7.2%
1.1%
20.1%
1.2%
13.9%
2.0%
2.0%
0.1%
22.3%
0.0%
0.7%
0.0%
0.0%
0.2%
2.8%
3.5%
100.0%
3.1%
35.9%
3.3%
10.8%
1.5%
45.4%
100.0%
7.9%
92.1%
100.0%
0.5%
4.4%
1.4%
14.7%
0.0%
29.4%
0.7%
7.6%
0.5%
12.2%
0.0%
26.6%
0.0%
0.1%
0.0%
0.2%
0.0%
0.2%
1.4%
100.0%
1.2%
12.5%
1.9%
27.9%
0.0%
56.5%
100.0%
3.1%
96.9%
100.0%
6.1%
10.6%
1.1%
5.1%
1.1%
28.5%
7.1%
13.8%
0.4%
3.9%
0.7%
18.2%
0.1%
0.5%
0.0%
0.1%
0.0%
1.1%
1.6%
100.0%
13.4%
25.2%
1.5%
9.4%
1.9%
48.7%
100.0%
16.8%
83.2%
100.0%
APPENDIX A
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 2
NEW ENG
TESTI NG OF DWELLI NGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units With Basements
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Slabs
Tested For Radon Levels
Tested Units Needing More Work
CONSTRUCTION METHOD
DWELLI NGS W TH RADON REDUCi NG FEATURES
Conventional Constructed On ate
Wth radon reducing features
No radon reducing features
Prefabricated Units (Fanelized)
Wth radon reducing features
No radon reducing features
Modular
Wth radon reducing features
No radon reducing features
ALL Dwellings
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
SIZE OF BUILDER
DWELLI NGS W TH RADON REDUCi NG FEATURES
One to Ten Dwellings Per Year
Wth radon reducing features
No radon reducing features
Eleven To Twenty-Rve Dwellings Per Year
Wth radon reducing features
No radon reducing features
Twenty-Sx To 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
CVer 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
41.2%
5.8%
41.3%
6.2%
17.5%
0.0%
41.4%
0.0%
17.9%
71.9%
0.6%
3.3%
0.0%
6.4%
18.5%
81.5%
100.0%
15.3%
45.5%
0.0%
18.0%
3.2%
4.8%
0.0%
13.3%
Ml D ATL
34.0%
20.3%
37.6%
20.5%
2.8%
0.0%
2.2%
0.0%
41.4%
48.8%
2.8%
0.0%
5.0%
2.0%
49.2%
50.8%
100.0%
14.7%
26.2%
8.4%
5.5%
26.2%
19.1%
0.0%
0.0%
ENCEN
18.8%
20.5%
19.5%
23.9%
27.1%
5.8%
8.8%
0.0%
32.1%
54.8%
2.7%
9.0%
0.0%
1.4%
34.7%
65.3%
100.0%
17.4%
38.7%
10.8%
3.5%
6.5%
17.9%
0.0%
5.3%
W N CEN
20.4%
8.9%
21.1%
9.0%
1.2%
0.0%
10.1%
0.0%
32.2%
49.1%
6.7%
10.3%
1.8%
0.0%
40.6%
59.4%
100.0%
24.5%
39.6%
10.8%
7.7%
5.4%
4.3%
0.0%
7.8%
SAIL
11.8%
6.6%
14.9%
7.1%
7.8%
8.4%
11.0%
6.0%
13.7%
77.4%
1.1%
7.1%
0.0%
0.6%
14.8%
85.2%
100.0%
7.1%
38.0%
2.4%
10.4%
1.7%
16.1%
3.6%
20.7%
E S CEN
3.9%
19.6%
9.7%
18.8%
8.5%
25.4%
0.6%
0.0%
13.5%
75.9%
0.6%
7.0%
0.0%
3.1%
14.1%
85.9%
100.0%
14.1%
44.6%
0.0%
15.3%
0.0%
26.1%
0.0%
0.0%
W S CEN
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
1.3%
86.1%
0.0%
12.6%
0.0%
0.0%
1.3%
98.7%
100.0%
0.3%
22.5%
0.0%
11.9%
1.0%
24.9%
0.0%
39.3%
MTN
6.6%
6.6%
10.0%
8.4%
9.8%
3.6%
2.2%
3.7%
7.0%
86.5%
0.9%
5.6%
0.0%
0.0%
7.9%
92.1%
100.0%
7.3%
21.5%
0.5%
12.1%
0.0%
35.6%
0.0%
23.0%
PAC
1.8%
0.0%
6.0%
0.0%
2.1%
0.0%
0.6%
0.0%
2.8%
91.3%
0.3%
5.5%
0.0%
0.1%
3.1%
96.9%
100.0%
3.1%
33.2%
0.0%
8.4%
0.0%
35.6%
0.0%
19.6%
US TOTAL
11.4%
12.4%
22.2%
14.5%
7.5%
8.3%
3.9%
5.1%
14.8%
74.7%
1.4%
7.6%
0.5%
0.9%
16.8%
83.2%
100.0%
9.0%
32.9%
3.1%
10.0%
3.8%
21.5%
0.9%
18.8%
APPENDIX A
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 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 Wth Sabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALI NG METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings Wth 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%)
SEALI NG METHODS - SLABS
(Multiple Answers Possible)
Dwellings Wth Sabs
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
22.2%
15.2%
2.1%
12.0%
41.6%
93.1%
0.0%
0.0%
0.0%
1.9%
1.9%
0.4%
1.2%
0.0%
3.1%
0.4%
5.0%
100.0%
32.3%
5.6%
23.1%
1.8%
2.5%
9.8%
0.0%
58.2%
133.2%
79.1%
0.0%
6.7%
0.0%
0.0%
7.5%
0.0%
13.4%
106.7%
Ml D ATL
11.3%
36.7%
3.9%
13.3%
24.6%
89.8%
4.8%
0.0%
0.2%
0.8%
5.7%
0.3%
3.9%
0.0%
0.0%
0.3%
4.4%
100.0%
48.3%
11.8%
17.3%
4.0%
0.0%
14.1%
0.2%
38.1%
133.7%
48.3%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
51.7%
100.0%
ENCEN
7.6%
25.6%
4.4%
17.4%
25.2%
80.1%
1.5%
0.1%
0.5%
5.9%
8.0%
0.1%
2.7%
0.4%
2.9%
5.8%
11.9%
100.0%
45.2%
8.7%
16.5%
4.4%
0.9%
30.8%
0.0%
43.6%
150.1%
62.9%
2.3%
20.5%
0.0%
4.6%
26.6%
0.0%
34.8%
151.6%
W N CEN
13.2%
36.5%
2.3%
14.0%
28.8%
94.9%
0.3%
0.3%
0.1%
1.2%
1.8%
0.0%
1.3%
0.0%
1.0%
1.0%
3.3%
100.0%
38.9%
5.1%
21.9%
7.2%
0.2%
27.5%
1.4%
47.1%
149.4%
34.0%
19.2%
7.5%
5.0%
0.0%
13.1%
0.0%
46.4%
125.2%
SAIL
4.1%
12.2%
0.3%
6.2%
5.6%
28.4%
0.5%
0.0%
2.5%
11.6%
14.5%
0.7%
1.8%
0.0%
25.3%
29.3%
57.1%
100.0%
47.1%
8.6%
15.0%
4.0%
0.0%
6.1%
0.0%
42.1%
122.9%
39.3%
1.9%
13.2%
0.4%
0.0%
0.3%
0.0%
48.2%
103.2%
ESCEN
2.0%
4.7%
0.8%
6.4%
7.2%
21.0%
4.1%
0.0%
6.1%
7.3%
17.5%
5.7%
4.5%
0.0%
33.1%
18.3%
61.5%
100.0%
48.3%
3.5%
19.4%
0.0%
0.0%
2.4%
0.0%
51.7%
125.3%
74.0%
0.0%
1.3%
0.2%
0.0%
0.9%
0.0%
26.0%
102.4%
W S CEN
0.0%
0.0%
0.1%
0.4%
0.3%
0.8%
0.0%
0.0%
0.1%
0.4%
0.5%
0.0%
1.2%
0.0%
24.3%
73.2%
98.7%
100.0%
93.2%
46.9%
3.8%
0.0%
44.4%
0.0%
0.0%
5.6%
193.8%
25.6%
0.1%
2.4%
0.0%
0.0%
4.2%
0.0%
74.4%
106.7%
MTN
1.0%
2.2%
0.9%
2.6%
32.3%
39.0%
2.8%
0.5%
1.1%
9.7%
14.1%
0.0%
1.3%
0.1%
10.0%
35.4%
46.9%
100.0%
15.8%
5.6%
14.1%
9.8%
0.2%
1.6%
0.2%
74.6%
121.8%
19.7%
2.0%
9.7%
2.0%
0.0%
0.0%
0.0%
70.8%
104.1%
PAC
0.3%
1.0%
0.2%
7.9%
4.2%
13.7%
0.9%
1.0%
7.3%
20.6%
29.8%
0.0%
0.0%
0.0%
27.0%
29.5%
56.5%
100.0%
53.2%
10.4%
8.3%
1.0%
0.0%
1.0%
1.6%
43.1%
118.6%
55.2%
0.4%
3.3%
0.0%
0.0%
0.0%
0.0%
44.3%
103.2%
US TOTAL
4.6%
12.2%
1.2%
7.3%
13.2%
38.6%
1.3%
0.2%
2.0%
7.4%
10.9%
0.6%
1.8%
0.0%
17.8%
30.3%
50.5%
100.0%
52.8%
15.6%
13.4%
3.4%
9.0%
8.3%
0.3%
39.4%
142.2%
42.7%
2.4%
7.9%
0.7%
0.4%
4.7%
0.0%
51.2%
110.0%
APPENDIX A
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 4
SUBSLAB PREPARATI ON -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Sabs
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%)
93.1%
0.7%
25.8%
4.5%
47.9%
44.6%
67.9%
0.0%
6.9%
291.4%
82.8%
4.2%
2.7%
6.0%
46.2%
56.7%
73.0%
1.1%
14.3%
287.1%
76.7%
7.3%
19.7%
1.7%
33.9%
49.8%
72.3%
2.9%
13.1%
277.5%
68.0%
2.0%
16.0%
2.4%
23.1%
40.2%
54.5%
5.8%
15.5%
227.4%
40.0%
7.9%
28.0%
1.0%
17.5%
11.9%
87.1%
2.6%
5.9%
202.0%
49.6%
5.1%
11.8%
0.8%
15.4%
14.2%
82.9%
5.2%
2.9%
188.1%
28.7%
2.3%
54.4%
0.1%
4.7%
8.2%
65.4%
1.3%
1.3%
166.4%
71.2%
1.7%
5.1%
2.3%
19.1%
19.8%
48.4%
5.5%
19.9%
193.0%
46.1%
11.9%
45.6%
3.2%
30.5%
6.3%
63.0%
8.8%
13.0%
228.4%
52.6%
5.4%
28.1%
1.8%
21.6%
21.7%
70.9%
3.5%
8.9%
214.6%
SUBSLAB PREPARATI ON -- 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%)
93.2%
0.7%
25.4%
4.7%
46.1%
42.7%
66.0%
0.0%
6.9%
285.7%
82.4%
4.3%
2.8%
6.6%
48.6%
55.2%
71.8%
1.1%
15.0%
287.8%
74.0%
8.5%
18.8%
1.9%
24.7%
44.8%
69.8%
2.9%
15.0%
260.5%
68.6%
2.0%
14.9%
2.3%
21.9%
40.2%
54.4%
5.9%
15.6%
226.0%
73.0%
7.5%
5.4%
0.9%
27.4%
17.9%
92.5%
2.5%
17.9%
244.9%
89.4%
2.4%
6.9%
0.0%
19.6%
25.9%
91.6%
0.0%
10.6%
246.5%
50.1%
2.5%
45.5%
1.3%
3.8%
46.3%
52.6%
0.0%
47.4%
249.5%
72.6%
1.4%
0.0%
10.8%
18.1%
28.5%
28.7%
0.2%
57.7%
217.9%
51.1%
16.1%
23.1%
3.7%
30.1%
13.0%
55.9%
0.5%
51.5%
245.0%
68.5%
5.7%
17.2%
2.9%
23.2%
32.4%
67.4%
1.5%
29.4%
248.2%
SUBSLAB PREPARATI ON -- SLABS
(Multiple Answers Possible)
Dwellings On Sabs
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%)
93.3%
0.0%
26.8%
0.0%
77.6%
77.6%
100.0%
0.0%
6.7%
382.0%
100.0%
0.0%
0.0%
0.0%
31.1%
79.4%
100.0%
0.0%
7.2%
317.8%
85.4%
0.0%
35.4%
0.0%
80.4%
63.0%
79.4%
1.5%
0.9%
346.1%
60.5%
0.0%
46.5%
12.1%
46.3%
33.7%
70.4%
0.0%
7.1%
276.7%
30.7%
6.8%
36.1%
0.2%
20.5%
10.3%
85.4%
1.9%
4.4%
196.3%
37.5%
4.4%
12.1%
0.9%
13.3%
5.3%
84.2%
5.7%
0.4%
163.8%
28.4%
2.2%
54.7%
0.0%
4.5%
8.0%
65.2%
1.3%
1.1%
165.3%
85.7%
0.4%
10.2%
2.0%
10.8%
10.1%
39.2%
5.4%
14.1%
177.9%
38.9%
9.5%
48.5%
4.0%
30.6%
5.7%
64.4%
9.2%
14.3%
225.1%
51.5%
3.5%
34.6%
1.6%
27.3%
23.3%
74.8%
2.7%
5.6%
225.0%
APPENDIX A
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGES
COST OF PASSI VE SUB-SLAB VENTI LATI ON
Sample Sze
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
34
31.0%
18.2%
13.9%
29.7%
1.0%
2.6%
3.7%
100.0%
Ml D ATL
53
34.3%
47.1%
1.9%
7.4%
8.2%
0.5%
0.5%
100.0%
ENCEN
79
43.0%
19.8%
19.9%
3.6%
1.5%
0.3%
12.0%
100.0%
W N CEN
75
28.3%
17.6%
28.5%
6.4%
4.6%
4.8%
9.9%
100.0%
SAIL
78
13.6%
40.4%
19.2%
14.1%
2.6%
6.0%
4.1%
100.0%
ESCEN
20
74.7%
3.6%
21.7%
0.0%
0.0%
0.0%
0.0%
100.0%
W S CEN
4
89.3%
10.7%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
MTN
32
63.3%
9.8%
12.9%
1.2%
5.7%
1.8%
5.3%
100.0%
PAC
13
51.9%
6.6%
28.1%
13.1%
0.0%
0.0%
0.3%
100.0%
US TOTAL
388
34.3%
28.9%
16.6%
8.2%
3.9%
2.7%
5.5%
100.0%
COST OF ACTI VE SUB-SLAB VENTI LATI ON
Sample Sze
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
15
8.3%
15.1%
3.2%
8.3%
3.2%
21.8%
40.1%
100.0%
19
42.8%
11.9%
5.0%
34.5%
2.0%
2.6%
1.2%
100.0%
37
12.4%
32.1%
16.5%
9.5%
19.5%
7.5%
2.5%
100.0%
20
1.9%
9.2%
17.5%
40.5%
0.4%
2.8%
27.7%
100.0%
16
19.6%
0.3%
0.9%
9.4%
0.2%
1.5%
68.1%
100.0%
4
51.7%
0.0%
0.0%
31.1%
13.8%
3.4%
0.0%
100.0%
0
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
13
27.9%
0.9%
0.0%
10.3%
0.9%
41.2%
18.7%
100.0%
3
87.2%
0.0%
0.0%
0.0%
10.3%
2.6%
0.0%
100.0%
127
27.2%
15.0%
9.0%
19.0%
8.5%
9.0%
12.4%
100.0%
APPENDIX A
-------
APPENDIX B
MULTI FAMILY
USAGE COEFFICIENT TABLES
BY THE NINE CENSUS DIVISIONS
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
MULTIFAMILY DWELLINGS - 2010 DATA
PAGE1
SAMPLE SIZE
Units
Builders
WGHTD AVERAGE UNITS PER BLDR
NEW ENG
209
13
16.1
Ml D ATL
372
12
31.0
ENCEN
142
19
7.5
W N CEN
211
24
8.8
SAIL
634
32
19.8
ESCEN
155
10
15.5
W S CEN
155
13
11.9
MTN
288
19
15.2
PAC
2106
24
87.7
US TOTAL I
4271
166
28.9
TYPE OF HOUSE: WITH RADON REDUCI NG FEATURES
One Story Dwellings With Basements
Wth radon reducing features
No radon reducing features
One story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
One Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATI ON -- EXCEPT R ERS
Basements
Wth radon reducing features
No radon reducing features
Crawl Spaces
Wth radon reducing features
No radon reducing features
Sabs on Grade
Wth radon reducing features
No radon reducing features
TOTAL
ALL DWELLI NGS -- EXCEPT ON R ERS
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
11.6%
31.3%
0.0%
3.8%
0.0%
4.3%
13.1%
24.4%
0.0%
3.8%
0.0%
4.3%
1.0%
1.9%
0.0%
0.0%
0.0%
0.3%
0.1%
100.0%
25.7%
57.7%
0.0%
7.6%
0.0%
9.0%
100.0%
25.7%
74.3%
100.0%
22.6%
1.1%
0.0%
3.5%
0.0%
14.9%
23.6%
3.1%
7.0%
3.5%
2.4%
14.9%
0.0%
0.0%
0.0%
0.0%
0.0%
3.6%
0.0%
100.0%
46.1%
4.1%
7.0%
7.0%
2.4%
33.3%
100.0%
55.6%
44.4%
100.0%
6.0%
26.0%
0.0%
0.1%
9.4%
15.1%
0.9%
19.4%
0.0%
0.2%
2.3%
5.1%
1.0%
9.0%
0.0%
0.2%
2.6%
2.6%
0.2%
100.0%
7.9%
54.4%
0.0%
0.5%
14.4%
22.8%
100.0%
22.2%
77.8%
100.0%
0.0%
25.5%
0.4%
0.6%
5.5%
27.0%
0.0%
15.4%
0.0%
0.0%
3.6%
9.3%
0.0%
0.0%
0.0%
0.0%
1.6%
9.3%
1.9%
100.0%
0.0%
41.6%
0.4%
0.6%
10.9%
46.5%
100.0%
11.3%
88.7%
100.0%
1.8%
6.2%
0.0%
0.1%
1.6%
20.5%
5.3%
8.0%
0.3%
0.2%
3.4%
26.8%
2.2%
9.6%
0.0%
0.5%
3.0%
8.9%
1.4%
100.0%
9.5%
24.1%
0.4%
0.8%
8.2%
57.1%
100.0%
18.0%
82.0%
100.0%
0.0%
5.2%
0.0%
10.3%
0.0%
36.8%
0.0%
0.0%
0.0%
0.0%
0.0%
27.1%
0.0%
0.0%
0.0%
0.0%
0.0%
20.7%
0.0%
100.0%
0.0%
5.2%
0.0%
10.3%
0.0%
84.5%
100.0%
0.0%
100.0%
100.0%
0.0%
0.0%
0.0%
0.0%
1.3%
65.2%
0.0%
0.0%
0.0%
0.0%
1.0%
24.3%
0.0%
0.0%
0.0%
0.0%
0.0%
8.2%
0.0%
100.0%
0.0%
0.0%
0.0%
0.0%
2.3%
97.7%
100.0%
2.3%
97.7%
100.0%
0.2%
8.2%
2.4%
8.0%
0.5%
42.3%
0.4%
11.7%
0.0%
3.9%
0.9%
16.3%
0.9%
0.5%
0.0%
0.1%
1.4%
2.3%
0.0%
100.0%
1.5%
20.4%
2.4%
12.0%
2.9%
60.9%
100.0%
6.8%
93.2%
100.0%
0.0%
4.4%
0.0%
4.4%
0.0%
22.8%
0.0%
4.5%
0.0%
4.1%
0.0%
30.4%
0.0%
4.5%
0.0%
0.6%
0.0%
21.9%
2.3%
100.0%
0.0%
13.8%
0.0%
9.4%
0.0%
76.9%
100.0%
0.0%
100.0%
100.0%
4.2%
8.6%
0.2%
2.6%
1.8%
29.2%
4.7%
7.5%
0.9%
1.6%
1.7%
20.7%
0.7%
3.7%
0.0%
0.2%
1.1%
9.8%
0.8%
100.0%
9.5%
20.0%
1.1%
4.5%
4.6%
60.2%
100.0%
15.3%
84.7%
100.0%
APPENDIX B
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
MULTIFAMILY DWELLINGS - 2010 DATA
PAGE 2
NEW ENG
TESTI NG OF DWELLI NGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units With Basements
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Slabs
Tested For Radon Levels
Tested Units Needing More Work
CONSTRUCTION METHOD
DWELLI NGS W TH RADON REDUCi NG FEATURES
Conventional Constructed On ate
Wth radon reducing features
No radon reducing features
Prefabricated Units (Fanelized)
Wth radon reducing features
No radon reducing features
Modular
Wth radon reducing features
No radon reducing features
ALL Dwellings
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
SIZE OF BUILDER
DWELLI NGS W TH RADON REDUCi NG FEATURES
One to Ten Dwellings Per Year
Wth radon reducing features
No radon reducing features
Seven To Twenty-Rve Dwellings Per Year
Wth radon reducing features
No radon reducing features
Twenty-Sx To 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
Over 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
46.1%
8.8%
38.8%
10.9%
75.7%
9.4%
88.9%
0.0%
24.9%
54.5%
0.8%
19.8%
0.0%
0.0%
25.7%
74.3%
100.0%
3.4%
9.1%
0.0%
16.6%
22.4%
48.6%
0.0%
0.0%
Ml D ATL
3.8%
5.7%
7.5%
5.7%
0.0%
0.0%
0.0%
0.0%
54.5%
27.4%
0.0%
10.8%
1.1%
6.3%
55.5%
44.5%
100.0%
4.3%
1.9%
1.0%
7.6%
50.3%
35.0%
0.0%
0.0%
ENCEN
5.6%
0.0%
5.7%
0.0%
16.7%
0.0%
5.3%
0.0%
20.0%
60.9%
2.3%
16.9%
0.0%
0.0%
22.2%
77.8%
100.0%
5.6%
47.9%
16.6%
8.7%
0.0%
21.2%
0.0%
0.0%
W N CEN
26.6%
7.1%
58.0%
0.0%
0.0%
0.0%
4.4%
75.8%
9.4%
70.0%
1.9%
18.7%
0.0%
0.0%
11.3%
88.7%
100.0%
11.3%
36.6%
0.0%
0.0%
0.0%
52.1%
0.0%
0.0%
SAIL
7.0%
1.1%
2.3%
0.9%
0.0%
0.0%
9.6%
1.1%
10.8%
81.3%
7.3%
0.7%
0.0%
0.0%
18.0%
82.0%
100.0%
2.1%
9.3%
6.6%
15.6%
9.3%
14.7%
0.0%
42.5%
E S CEN
29.7%
13.0%
0.0%
0.0%
0.0%
0.0%
35.1%
13.0%
0.0%
49.0%
0.0%
51.0%
0.0%
0.0%
0.0%
100.0%
100.0%
0.0%
18.1%
0.0%
36.8%
0.0%
45.2%
0.0%
0.0%
W S CEN
1.9%
0.0%
0.0%
0.0%
0.0%
0.0%
1.9%
0.0%
2.3%
95.2%
0.0%
2.6%
0.0%
0.0%
2.3%
97.7%
100.0%
2.3%
18.4%
0.0%
18.1%
0.0%
61.3%
0.0%
0.0%
MTN
6.5%
2.9%
11.9%
4.3%
25.1%
1.6%
0.5%
5.0%
6.8%
93.2%
0.0%
0.0%
0.0%
0.0%
6.8%
93.2%
100.0%
3.1%
12.2%
3.7%
19.5%
0.0%
61.5%
0.0%
0.0%
PAC
0.1%
0.0%
0.0%
0.0%
0.0%
0.0%
0.1%
0.0%
0.0%
99.5%
0.0%
0.5%
0.0%
0.0%
0.0%
100.0%
100.0%
0.0%
2.0%
0.0%
3.1%
0.0%
17.5%
0.0%
77.4%
US TOTAL
8.9%
6.8%
14.1%
4.5%
8.9%
5.4%
6.6%
9.3%
13.3%
75.0%
1.9%
8.9%
0.1%
0.8%
15.3%
84.7%
100.0%
3.0%
14.8%
3.3%
12.9%
9.0%
34.9%
0.0%
22.2%
APPENDIX B
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
MULTIFAMILY DWELLINGS - 2010 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 Wth Sabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALI NG METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings Wth 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%)
SEALI NG METHODS - SLABS
(Multiple Answers Possible)
Dwellings Wth Sabs
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
43.8%
22.0%
3.7%
3.5%
10.4%
83.4%
0.0%
0.0%
7.2%
0.4%
7.6%
0.0%
0.0%
0.0%
8.0%
1.0%
9.0%
100.0%
63.4%
12.1%
31.6%
0.0%
0.0%
2.9%
0.0%
36.6%
146.5%
88.9%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
11.1%
100.0%
Ml D ATL
3.3%
46.1%
0.0%
0.0%
0.8%
50.3%
7.0%
0.0%
0.0%
7.0%
14.0%
0.0%
2.4%
0.0%
10.8%
22.6%
35.8%
100.0%
10.7%
0.0%
10.7%
0.0%
0.0%
10.7%
0.0%
89.3%
121.4%
6.8%
30.1%
0.0%
30.1%
0.0%
0.0%
0.0%
63.2%
130.1%
ENCEN
4.4%
7.3%
0.6%
7.6%
42.4%
62.3%
0.0%
0.0%
0.0%
0.5%
0.5%
10.4%
14.4%
0.0%
2.8%
9.6%
37.2%
100.0%
22.7%
0.0%
10.4%
4.5%
0.0%
12.6%
0.0%
73.8%
124.0%
7.6%
0.0%
15.9%
0.0%
0.0%
15.9%
0.0%
76.5%
115.9%
W N CEN
23.7%
0.0%
0.0%
8.5%
9.4%
41.6%
0.4%
0.0%
0.6%
0.0%
1.0%
0.0%
10.9%
0.0%
31.3%
15.2%
57.4%
100.0%
18.2%
2.3%
0.0%
0.0%
0.0%
0.0%
0.0%
79.5%
100.0%
61.9%
5.0%
9.9%
1.7%
0.0%
59.5%
0.0%
33.1%
171.0%
SAIL
0.0%
9.5%
0.0%
20.2%
4.0%
33.6%
0.4%
0.0%
0.0%
0.8%
1.1%
1.4%
8.1%
0.0%
23.5%
32.2%
65.3%
100.0%
37.5%
0.0%
51.1%
12.7%
0.0%
19.7%
0.0%
12.8%
133.8%
38.0%
0.7%
17.4%
3.9%
0.0%
4.8%
0.0%
50.7%
115.5%
ESCEN
0.0%
0.0%
0.0%
0.0%
5.2%
5.2%
0.0%
0.0%
0.0%
10.3%
10.3%
0.0%
0.0%
0.0%
61.9%
22.6%
84.5%
100.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
100.0%
73.3%
0.0%
53.4%
0.0%
0.0%
0.0%
0.0%
26.7%
153.4%
W S CEN
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
2.3%
0.0%
54.5%
43.2%
100.0%
100.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
31.0%
1.9%
27.7%
1.9%
0.0%
1.3%
0.0%
43.2%
107.1%
MTN
0.7%
1.5%
0.0%
0.0%
19.7%
21.9%
0.0%
2.4%
0.7%
11.3%
14.4%
0.0%
2.9%
0.0%
0.0%
60.9%
63.7%
100.0%
6.8%
0.0%
0.0%
0.0%
0.0%
1.0%
0.0%
93.3%
101.0%
4.5%
0.0%
0.0%
0.0%
0.0%
0.6%
0.0%
95.5%
100.6%
PAC
0.0%
0.0%
0.0%
0.4%
13.4%
13.8%
0.0%
0.0%
1.5%
7.9%
9.4%
0.0%
0.0%
0.0%
12.3%
64.5%
76.9%
100.0%
3.2%
0.7%
0.0%
0.0%
0.0%
0.0%
0.0%
96.8%
100.7%
15.9%
0.5%
1.3%
0.0%
0.0%
0.0%
0.0%
84.0%
101.7%
US TOTAL
4.3%
9.3%
0.2%
5.8%
9.9%
29.5%
1.0%
0.2%
0.6%
3.9%
5.6%
1.3%
4.6%
0.0%
23.9%
35.1%
64.8%
100.0%
19.3%
0.9%
17.1%
3.7%
0.0%
8.1%
0.0%
67.7%
116.8%
30.3%
4.6%
13.9%
4.9%
0.0%
6.8%
0.0%
57.7%
118.2%
APPENDIX B
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
MULTIFAMILY DWELLINGS - 2010 DATA
PAGE 4
NEW ENG
Ml D ATL
ENCEN
W N CEN
SAIL
E S CEN
W S CEN
MTN
PAC
US TOTAL
SUBSLAB PREPARATI ON -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Sabs
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%)
97.9%
0.0%
1.0%
0.0%
24.4%
55.0%
72.0%
0.0%
6.4%
256.8%
96.3%
0.0%
0.0%
13.4%
22.5%
52.5%
57.5%
0.0%
3.8%
245.9%
79.1%
8.5%
11.7%
0.0%
12.8%
38.7%
81.0%
0.0%
16.1%
247.8%
64.2%
2.3%
39.3%
3.8%
7.7%
38.3%
53.6%
5.7%
1.5%
216.3%
70.7%
3.0%
24.8%
0.5%
52.2%
39.4%
78.3%
8.5%
24.4%
301.6%
47.5%
28.8%
0.0%
5.8%
31.7%
2.9%
66.2%
18.0%
5.8%
206.5%
72.9%
1.9%
37.4%
1.9%
11.6%
1.9%
98.1%
18.1%
0.0%
243.9%
33.1%
32.5%
0.0%
0.0%
29.5%
27.1%
29.4%
0.0%
21.1%
172.6%
82.5%
1.0%
92.2%
0.9%
12.4%
0.5%
76.8%
1.0%
8.6%
275.9%
73.6%
6.1%
30.8%
2.8%
24.5%
25.6%
72.8%
6.4%
10.7%
253.5%
SUBSLAB PREPARATI ON -- 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%)
97.7%
0.0%
1.2%
0.0%
17.4%
51.3%
69.0%
0.0%
5.9%
242.4%
93.6%
0.0%
0.0%
1.6%
4.3%
50.8%
48.7%
0.0%
6.4%
205.3%
89.6%
0.0%
9.2%
0.0%
6.8%
38.7%
81.8%
0.0%
6.8%
233.0%
37.6%
0.9%
4.6%
2.3%
0.0%
2.3%
82.9%
13.7%
1.1%
145.3%
86.2%
1.4%
11.4%
0.0%
45.7%
72.2%
91.4%
5.6%
64.3%
378.3%
100.0%
0.0%
0.0%
50.0%
50.0%
50.0%
100.0%
0.0%
100.0%
450.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
60.3%
0.0%
0.0%
0.0%
8.9%
4.2%
6.8%
0.0%
69.4%
149.6%
98.3%
0.0%
96.8%
0.7%
0.0%
0.7%
29.4%
0.0%
2.4%
228.4%
85.7%
0.4%
24.1%
4.4%
18.3%
36.8%
63.5%
2.5%
32.0%
267.7%
SUBSLAB PREPARATI ON -- SLABS
(Multiple Answers Possible)
Dwellings On Sabs
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%
88.9%
88.9%
100.0%
0.0%
11.1%
388.9%
100.0%
0.0%
0.0%
30.1%
48.1%
54.9%
69.9%
0.0%
0.0%
303.0%
61.4%
22.8%
15.9%
0.0%
22.8%
38.6%
79.5%
0.0%
31.8%
272.7%
83.4%
3.4%
64.4%
5.0%
13.2%
64.4%
32.3%
0.0%
1.7%
267.8%
62.7%
3.9%
31.6%
0.7%
55.5%
22.4%
71.5%
9.9%
3.9%
262.1%
44.3%
30.5%
0.0%
3.1%
30.5%
0.0%
64.1%
19.1%
0.0%
191.6%
72.9%
1.9%
37.4%
1.9%
11.6%
1.9%
98.1%
18.1%
0.0%
243.9%
23.7%
43.6%
0.0%
0.0%
36.6%
35.0%
37.2%
0.0%
4.5%
180.5%
79.7%
1.2%
91.3%
1.0%
14.6%
0.5%
85.3%
1.2%
9.7%
284.4%
70.8%
8.6%
34.2%
4.8%
33.1%
25.9%
74.4%
6.4%
6.3%
264.6%
APPENDIX B
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
MULTIFAMILY DWELLINGS - 2010 DATA
PAGES
COST OF PASSI VE SUB-SLAB VENTI LATI ON
Sample Sze
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
13.0%
60.9%
2.2%
2.2%
0.0%
21.7%
0.0%
100.0%
Ml D ATL
7
63.1%
17.8%
10.8%
3.3%
5.0%
0.0%
0.0%
100.0%
ENCEN
7
47.6%
9.5%
28.6%
9.5%
4.8%
0.0%
0.0%
100.0%
W N CEN
7
7.2%
60.2%
15.7%
7.2%
0.0%
9.6%
0.0%
100.0%
SAIL
11
36.2%
23.4%
22.0%
10.6%
0.0%
0.0%
7.8%
100.0%
ESCEN
0
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
W S CEN
2
100.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
MTN
4
82.7%
2.7%
14.7%
0.0%
0.0%
0.0%
0.0%
100.0%
PAC
0
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
US TOTAL
47
49.5%
22.3%
15.5%
6.0%
2.9%
1.9%
2.0%
100.0%
COST OF ACTI VE SUB-SLAB VENTI LATI ON
Sample Sze
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%
0.0%
45.5%
2.6%
26.0%
26.0%
100.0%
0
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
2
0.0%
100.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
0
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
2
0.0%
0.0%
37.5%
0.0%
0.0%
0.0%
62.5%
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%
2
77.8%
0.0%
0.0%
0.0%
0.0%
22.2%
0.0%
100.0%
0
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
12
33.7%
13.6%
0.8%
18.6%
1.1%
20.2%
12.0%
100.0%
APPENDIX B
-------
APPENDIX C
SINGLE-FAMILY DETACHED
USAGE COEFFICIENT TABLES
BY THE 32 STATE-MARKET-AREAS
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE1
SAMPLE SIZE
Units
Builders
WGHTD AVERAGE UNITS PER BLDR
TYPE OF HOUSE: WITH RADON REDUCI NG FEATURES
One Story Dwellings With Basements
Wth radon reducing features
No radon reducing features
One story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
One Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATI ON -- EXCEPT R ERS
Basements
Wth radon reducing features
No radon reducing features
Crawl Spaces
Wth radon reducing features
No radon reducing features
Sabs on Grade
Wth radon reducing features
No radon reducing features
TOTAL
ALL DWELLI NGS -- EXCEPT ON R ERS
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
CT & Rl & MA
180
51
3.5
2.2%
10.5%
0.0%
0.3%
0.0%
2.4%
13.6%
65.0%
0.0%
0.8%
0.0%
1.9%
0.0%
0.5%
0.0%
0.0%
0.0%
0.0%
2.7%
100.0%
16.2%
78.2%
0.0%
1.1%
0.0%
4.4%
100.0%
16.2%
83.8%
100.0%
ME&NH&VT
101
40
2.5
2.9%
22.7%
0.0%
1.5%
2.0%
1.6%
14.9%
48.6%
0.0%
1.5%
1.0%
1.3%
1.0%
1.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
18.8%
72.3%
0.0%
3.0%
3.0%
3.0%
100.0%
21.8%
78.2%
100.0%
NEWENG
281
91
3.1
2.4%
15.4%
0.0%
0.8%
0.8%
2.1%
14.2%
58.4%
0.0%
1.1%
0.4%
1.7%
0.4%
0.7%
0.0%
0.0%
0.0%
0.0%
1.6%
100.0%
17.3%
75.8%
0.0%
1.9%
1.2%
3.8%
100.0%
18.5%
81.5%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 2
CT & Rl & 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 Wth Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Sabs
Tested For Radon Levels
Tested Units Needing More Work
56.5%
5.0%
56.2%
5.3%
50.0%
0.0%
64.4%
0.0%
18.3%
9.3%
19.0%
9.9%
0.0%
0.0%
16.7%
0.0%
41.2%
5.8%
41.3%
6.2%
17.5%
0.0%
41.4%
0.0%
CONSTRUCTION METHOD
DWELLI NGS W TH RADON REDUCi NG FEATURES
Conventional Constructed On ate
Wth radon reducing features
No radon reducing features
Prefabricated Units (Fanelized)
Wth radon reducing features
No radon reducing features
Modular
Wth radon reducing features
No radon reducing features
ALL Dwellings
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
16.2%
82.6%
0.0%
1.1%
0.0%
0.0%
16.2%
83.8%
100.0%
20.3%
55.9%
1.5%
6.4%
0.0%
15.8%
21.8%
78.2%
100.0%
17.9%
71.9%
0.6%
3.3%
0.0%
6.4%
18.5%
81.5%
100.0%
SIZE OF BUILDER
DWELLI NGS W TH RADON REDUCi NG FEATURES
One to Ten Dwellings Per Year
Wth radon reducing features
No radon reducing features
Seven To Twenty-Rve Dwellings Per Year
Wth radon reducing features
No radon reducing features
Twenty-Sx To 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
Over 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
16.2%
42.1%
0.0%
19.4%
0.0%
0.0%
0.0%
22.2%
13.9%
50.5%
0.0%
15.8%
7.9%
11.9%
0.0%
0.0%
15.3%
45.5%
0.0%
18.0%
3.2%
4.8%
0.0%
13.3%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 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 Wth Sabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALI NG METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings Wth 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%)
SEALI NG METHODS - SLABS
(Multiple Answers Possible)
Dwellings Wth Sabs
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 & Rl & MA
14.9%
13.4%
2.8%
16.7%
46.7%
94.5%
0.0%
0.0%
0.0%
1.1%
1.1%
0.0%
0.0%
0.0%
4.4%
0.0%
4.4%
100.0%
27.7%
6.5%
18.8%
2.9%
4.1%
14.1%
0.0%
59.4%
133.5%
87.5%
0.0%
0.0%
0.0%
0.0%
12.5%
0.0%
0.0%
100.0%
ME&NH&VT
33.2%
17.8%
1.0%
5.0%
34.2%
91.1%
0.0%
0.0%
0.0%
3.0%
3.0%
1.0%
3.0%
0.0%
1.0%
1.0%
5.9%
100.0%
39.1%
4.4%
29.4%
0.0%
0.0%
3.3%
0.0%
56.5%
132.6%
66.7%
0.0%
16.7%
0.0%
0.0%
0.0%
0.0%
33.3%
116.7%
NEWENG
22.2%
15.2%
2.1%
12.0%
41.6%
93.1%
0.0%
0.0%
0.0%
1.9%
1.9%
0.4%
1.2%
0.0%
3.1%
0.4%
5.0%
100.0%
32.3%
5.6%
23.1%
1.8%
2.5%
9.8%
0.0%
58.2%
133.2%
79.1%
0.0%
6.7%
0.0%
0.0%
7.5%
0.0%
13.4%
106.7%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 4
SUBSLAB FREPARATI ON -- BASEMENTS & SLABS
(Multiple Answers Fbssible)
Dwellings On Basements And Sabs
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
Rastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
CT & Rl & MA
96.1%
1.1%
31.5%
6.2%
50.6%
41.0%
79.2%
0.0%
3.4%
309.0%
ME&NH&VT
88.8%
0.0%
17.4%
2.0%
43.9%
50.0%
51.0%
0.0%
12.2%
265.3%
NEWENG
93.1%
0.7%
25.8%
4.5%
47.9%
44.6%
67.9%
0.0%
6.9%
291.4%
SUBSLAB FREPARATI ON -- BASEMENTS
(Multiple Answers Fbssible)
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
Rastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
95.9%
1.2%
32.9%
6.5%
50.0%
40.0%
78.2%
0.0%
3.5%
308.2%
89.1%
0.0%
14.1%
2.2%
40.2%
46.7%
47.8%
0.0%
12.0%
252.2%
93.2%
0.7%
25.4%
4.7%
46.1 %
42.7%
66.0%
0.0%
6.9%
285.7%
SUBSLAB PREPARATI ON -- SLABS
(Multiple Answers Fbssible)
Dwellings On Sabs
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
Rastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
100.0%
0.0%
0.0%
0.0%
62.5%
62.5%
100.0%
0.0%
0.0%
325.0%
83.3%
0.0%
66.7%
0.0%
100.0%
100.0%
100.0%
0.0%
16.7%
466.7%
93.3%
0.0%
26.8%
0.0%
77.6%
77.6%
100.0%
0.0%
6.7%
382.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGES
CT & Rl & MA
ME& NH& VT
COST OF PASSIVE SUB-SLAB VENTILATI ON
Sample Sze
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
16
55.4%
21.4%
10.7%
3.6%
0.0%
5.4%
3.6%
100.0%
18
7.6%
15.1%
17.0%
54.7%
1.9%
0.0%
3.8%
100.0%
34
31.0%
18.2%
13.9%
29.7%
1.0%
2.6%
3.7%
100.0%
COST OF ACTI VE SUB-SLAB VENTI LATI ON
Sample Sze
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
6.3%
18.8%
0.0%
6.3%
0.0%
25.0%
43.8%
100.0%
16.7%
0.0%
16.7%
16.7%
16.7%
8.3%
25.0%
100.0%
15
8.3%
15.1%
3.2%
8.3%
3.2%
21.8%
40.1%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGES
SAMPLE SIZE
Units
Builders
W3HTD AVERAGE UNITS PER BLDR
TYPE OF HOUSE: WITH RADON REDUCI NG FEATURES
One Story Dwellings With Basements
Wth radon reducing features
No radon reducing features
One story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
One Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATI ON -- EXCEPT R ERS
Basements
Wth radon reducing features
No radon reducing features
Crawl Spaces
Wth radon reducing features
No radon reducing features
Slabs on Grade
Wth radon reducing features
No radon reducing features
TOTAL
ALL DWELLI NGS -- EXCEPT ON R ERS
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
NJ
266
40
6.6
0.8%
1.5%
0.0%
1.9%
0.0%
0.4%
27.8%
55.4%
0.0%
0.8%
0.2%
0.0%
0.0%
11.3%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
28.6%
68.2%
0.0%
2.7%
0.2%
0.4%
100.0%
28.7%
71.3%
100.0%
NY
149
38
3.9
3.0%
17.1%
0.0%
0.0%
0.0%
1.3%
7.1%
71.5%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
10.1%
88.6%
0.0%
0.0%
0.0%
1.3%
100.0%
10.1%
89.9%
100.0%
PA
259
39
6.6
31.5%
8.8%
8.7%
0.3%
7.0%
0.2%
32.2%
9.2%
1.0%
0.5%
0.8%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
63.7%
18.0%
9.7%
0.8%
7.7%
0.2%
100.0%
81.1%
18.9%
100.0%
Ml D ATL I
674
117
5.9
16.6%
9.6%
4.3%
0.5%
3.4%
0.6%
24.0%
37.2%
0.5%
0.4%
0.4%
0.0%
0.0%
2.4%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
40.6%
49.3%
4.8%
1.0%
3.9%
0.6%
100.0%
49.2%
50.8%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 7
TESTI NG OF DWELLI NGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units With Basements
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Slabs
Tested For Radon Levels
Tested Units Needing More Work
CONSTRUCTION METHOD
DWELLI NGS W TH RADON REDUCi NG FEATURES
Conventional Constructed On ate
Wth radon reducing features
No radon reducing features
Prefabricated Units (Fanelized)
Wth radon reducing features
No radon reducing features
Modular
Wth radon reducing features
No radon reducing features
ALL Dwellings
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
SIZE OF BUILDER
DWELLI NGS W TH RADON REDUCi NG FEATURES
One to Ten Dwellings Per Year
Wth radon reducing features
No radon reducing features
Eleven To Twenty-Rve Dwellings Per Year
Wth radon reducing features
No radon reducing features
Twenty-Sx To 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
CVer 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
NJ
69.0%
1.7%
70.5%
1.8%
28.0%
0.0%
0.0%
0.0%
27.0%
70.9%
1.7%
0.0%
0.0%
0.4%
28.7%
71.3%
100.0%
12.0%
12.5%
16.8%
7.7%
0.0%
51.1%
0.0%
0.0%
NY
20.1%
11.6%
20.3%
11.6%
0.0%
0.0%
0.0%
0.0%
8.7%
83.2%
0.7%
0.0%
0.7%
6.7%
10.1%
89.9%
100.0%
10.1%
61.7%
0.0%
0.0%
0.0%
28.2%
0.0%
0.0%
PA
27.1%
44.6%
32.9%
44.9%
0.0%
0.0%
2.4%
0.0%
66.8%
18.9%
4.6%
0.0%
9.7%
0.0%
81.1%
18.9%
100.0%
18.5%
11.2%
9.7%
7.7%
52.9%
0.0%
0.0%
0.0%
Ml D ATL
34.0%
20.3%
37.6%
20.5%
2.8%
0.0%
2.2%
0.0%
41.4%
48.8%
2.8%
0.0%
5.0%
2.0%
49.2%
50.8%
100.0%
14.7%
26.2%
8.4%
5.5%
26.2%
19.1%
0.0%
0.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 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 Wth Sabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALI NG METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings Wth 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%)
SEALI NG METHODS - SLABS
(Multiple Answers Possible)
Dwellings Wth Sabs
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%)
NJ
4.7%
17.5%
11.1%
1.1%
62.4%
96.8%
0.0%
0.0%
0.0%
2.7%
2.7%
0.0%
0.2%
0.0%
0.0%
0.4%
0.5%
100.0%
24.5%
1.6%
7.8%
0.0%
0.0%
9.7%
0.0%
74.8%
118.3%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
100.0%
NY
16.1%
9.4%
0.7%
40.9%
31.5%
98.7%
0.0%
0.0%
0.0%
0.0%
0.0%
0.7%
0.0%
0.0%
0.0%
0.7%
1.3%
100.0%
44.9%
8.8%
9.5%
4.1%
0.0%
7.5%
0.7%
40.8%
116.3%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
100.0%
PA
11.4%
61.0%
2.7%
2.3%
4.3%
81.7%
9.7%
0.0%
0.4%
0.4%
10.4%
0.2%
7.7%
0.0%
0.0%
0.0%
7.9%
100.0%
60.5%
18.0%
26.0%
5.7%
0.0%
19.9%
0.0%
20.6%
150.6%
97.6%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
2.4%
100.0%
Ml D ATL
11.3%
36.7%
3.9%
13.3%
24.6%
89.8%
4.8%
0.0%
0.2%
0.8%
5.7%
0.3%
3.9%
0.0%
0.0%
0.3%
4.4%
100.0%
48.3%
11.8%
17.3%
4.0%
0.0%
14.1%
0.2%
38.1%
133.7%
48.3%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
51.7%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGES
SUBSLAB PREPARATI ON -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Sabs
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%)
NJ
70.3%
10.8%
0.0%
0.0%
57.6%
31.7%
59.8%
1.6%
9.4%
241.1%
NY
73.8%
2.7%
9.4%
0.0%
23.5%
54.4%
71.8%
2.7%
14.1%
252.3%
PA
93.5%
2.2%
0.0%
12.1%
54.7%
69.0%
79.3%
0.0%
16.6%
327.4%
Ml D ATL
82.8%
4.2%
2.7%
6.0%
46.2%
56.7%
73.0%
1.1%
14.3%
287.1%
SUBSLAB PREPARATI ON -- 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%)
70.1%
10.9%
0.0%
0.0%
57.5%
31.5%
59.6%
1.6%
9.3%
240.4%
73.5%
2.7%
9.5%
0.0%
23.1%
54.4%
71.4%
2.7%
14.3%
251.7%
92.9%
2.4%
0.0%
13.2%
59.8%
66.0%
77.3%
0.0%
18.0%
329.6%
82.4%
4.3%
2.8%
6.6%
48.6%
55.2%
71.8%
1.1%
15.0%
287.8%
SUBSLAB PREPARATI ON -- SLABS
(Multiple Answers Possible)
Dwellings On Sabs
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%
71.9%
71.9%
100.0%
0.0%
28.1%
371.9%
100.0%
0.0%
0.0%
0.0%
50.0%
50.0%
100.0%
0.0%
0.0%
300.0%
100.0%
0.0%
0.0%
0.0%
2.4%
100.0%
100.0%
0.0%
2.4%
304.9%
100.0%
0.0%
0.0%
0.0%
31.1 %
79.4%
100.0%
0.0%
7.2%
317.8%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 10
OOST OF PASSIVE SUB-SLAB VENTILATI ON
Sample Sze
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
18
12.5%
26.6%
4.7%
26.6%
21.9%
6.3%
1.6%
100.0%
12
17.8%
22.2%
24.4%
4.4%
24.4%
0.0%
6.7%
100.0%
23
37.6%
50.9%
0.0%
5.8%
5.8%
0.0%
0.0%
100.0%
53
34.3%
47.1%
1.9%
7.4%
8.2%
0.5%
0.5%
100.0%
COST OF ACTI VE SUB-SLAB VENTI LATI ON
Sample Sze
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
6
33.3%
6.7%
0.0%
56.7%
3.3%
0.0%
0.0%
100.0%
12.5%
0.0%
62.5%
0.0%
0.0%
0.0%
25.0%
100.0%
9
64.1%
22.8%
5.4%
0.0%
0.0%
7.6%
0.0%
100.0%
19
42.8%
11.9%
5.0%
34.5%
2.0%
2.6%
1.2%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 11
SAMPLE SIZE
Units
Builders
W3HTD AVERAGE UNITS PER BLDR
257
38
6.8
261
41
6.4
129
38
3.4
135
41
3.3
133
40
3.3
915
198
4.6
TYPE OF HOUSE: WITH RADON REDUCING FEATURES
One Story Dwellings With Basements
Wth radon reducing features 22.0%
No radon reducing features 31.8%
One story Dwellings Wth Crawl Spaces
Wth radon reducing features 0.0%
No radon reducing features 0.4%
One Story Dwellings On Slabs
Wth radon reducing features 0.0%
No radon reducing features 7.7%
Two Story Dwellings Wth Basements
Wth radon reducing features 10.0%
No radon reducing features 25.3%
Two Story Dwellings Wth Crawl Spaces
Wth radon reducing features 0.0%
No radon reducing features 0.0%
Two Story Dwellings On Slabs
Wth radon reducing features 0.0%
No radon reducing features 0.5%
Three Story Dwellings Wth Basements
Wth radon reducing features 0.0%
No radon reducing features 1.9%
Three Story Dwellings Wth Crawl Spaces
Wth radon reducing features 0.0%
No radon reducing features 0.0%
Three Story Dwellings On Slabs
Wth radon reducing features 0.0%
No radon reducing features 0.4%
Houses on piers 0.0%
TOTAL 100.0%
8.5%
21.1%
6.3%
3.7%
2.7%
22.9%
2.9%
25.0%
0.2%
1.3%
3.0%
2.4%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
20.7%
14.6%
0.8%
4.7%
7.5%
1.1%
28.4%
18.7%
0.0%
2.4%
0.3%
0.1%
0.0%
0.8%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
4.4%
35.7%
0.0%
12.5%
0.7%
1.5%
5.9%
35.4%
0.0%
3.8%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
49.1%
30.3%
0.0%
0.5%
0.9%
3.4%
8.4%
5.4%
0.0%
0.3%
0.3%
1.5%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
19.6%
26.9%
1.6%
4.7%
2.3%
7.8%
10.4%
22.8%
0.0%
1.7%
0.8%
0.9%
0.0%
0.5%
0.0%
0.0%
0.0%
0.1%
0.0%
100.0%
TYPE OF FOUNDATI ON -- EXCEPT R ERS
Basements
Wth radon reducing features
No radon reducing features
Crawl Spaces
Wth radon reducing features
No radon reducing features
Slabs on Grade
Wth radon reducing features
No radon reducing features
TOTAL
32.0%
59.1%
0.0%
0.4%
0.0%
8.6%
100.0%
11.4%
46.1%
6.5%
5.0%
5.8%
25.3%
100.0%
49.1%
34.1%
0.8%
7.1%
7.8%
1.2%
100.0%
10.4%
71.1%
0.0%
16.3%
0.7%
1.5%
100.0%
57.5%
35.7%
0.0%
0.8%
1.1%
4.9%
100.0%
30.0%
50.1%
1.6%
6.4%
3.1%
8.8%
100.0%
ALL DWELLINGS -- EXCEPT ON R ERS
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
32.0%
68.1%
100.0%
23.7%
76.3%
100.0%
57.6%
42.4%
100.0%
11.1%
88.9%
100.0%
58.7%
41.4%
100.0%
34.7%
65.3%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 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 Wth Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Slabs
Tested For Radon Levels
Tested Units Needing More Work
30.4%
46.1%
31.8%
48.5%
0.0%
0.0%
17.3%
0.0%
10.7%
15.9%
8.8%
25.9%
47.9%
7.0%
0.3%
0.0%
32.9%
6.2%
34.5%
7.2%
9.9%
0.0%
38.9%
0.0%
13.0%
19.6%
11.9%
24.6%
20.5%
5.0%
0.0%
0.0%
11.4%
1.1%
11.4%
1.1%
0.0%
0.0%
12.5%
0.0%
18.8%
20.5%
19.5%
23.9%
27.1 %
5.8%
8.8%
0.0%
CONSTRUCTION METHOD
DWELLI NGS W TH RADON REDUCi NG FEATURES
Conventional Constructed On ate
Wth radon reducing features
No radon reducing features
Prefabricated Units (Fanelized)
Wth radon reducing features
No radon reducing features
Modular
Wth radon reducing features
No radon reducing features
ALL Dwellings
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
32.0%
64.2%
0.0%
1.2%
0.0%
2.7%
32.0%
68.1%
100.0%
23.7%
49.9%
0.0%
26.4%
0.0%
0.0%
23.7%
76.3%
100.0%
46.6%
36.3%
11.0%
5.4%
0.0%
0.8%
57.6%
42.4%
100.0%
11.1%
85.2%
0.0%
3.7%
0.0%
0.0%
11.1%
88.9%
100.0%
54.9%
31.6%
3.8%
5.3%
0.0%
4.5%
58.7%
41.4%
100.0%
32.1%
54.8%
2.7%
9.0%
0.0%
1.4%
34.7%
65.3%
100.0%
SIZE OF BUILDER
DWELLI NGS W TH RADON REDUCi NG FEATURES
One to Ten Dwellings Per Year
Wth radon reducing features
No radon reducing features
Eleven To Twenty-Rve Dwellings Per Year
Wth radon reducing features
No radon reducing features
Twenty-Sx To 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
CVer 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
5.3%
21.2%
14.4%
0.0%
12.3%
46.9%
0.0%
0.0%
13.3%
34.2%
10.3%
0.0%
0.0%
19.2%
0.0%
23.0%
20.2%
36.4%
13.4%
6.0%
24.0%
0.0%
0.0%
0.0%
11.1%
56.3%
0.0%
10.4%
0.0%
22.2%
0.0%
0.0%
39.9%
41.4%
18.8%
0.0%
0.0%
0.0%
0.0%
0.0%
17.4%
38.7%
10.8%
3.5%
6.5%
17.9%
0.0%
5.3%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 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
5.5%
28.5%
3.5%
19.3%
34.4%
91.1%
3.1%
11.0%
0.4%
15.4%
27.6%
57.5%
7.0%
40.4%
8.7%
10.6%
16.5%
83.2%
17.6%
9.6%
0.7%
23.1%
30.4%
81.5%
3.4%
47.0%
10.5%
17.3%
15.0%
93.2%
7.6%
25.6%
4.4%
17.4%
25.2%
80.1%
Dwellings With Crawl Spaces
Passive stack subslab ventilation
Fan-driven (active) ventilation
Foundation Wall Vents
None
SUBTOTAL - CRAWL SPACES
0.0%
0.0%
0.0%
0.4%
0.4%
6.5%
0.0%
0.4%
4.6%
11.5%
0.0%
0.8%
2.3%
4.8%
7.9%
0.0%
0.0%
0.0%
16.3%
16.3%
0.0%
0.0%
0.0%
0.8%
0.8%
1.5%
0.1%
0.5%
5.9%
8.0%
Dwellings Wth Sabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
0.0%
0.0%
0.0%
7.4%
1.2%
8.6%
100.0%
0.4%
5.8%
0.0%
1.9%
23.0%
31.0%
100.0%
0.0%
6.4%
1.4%
0.8%
0.5%
9.0%
100.0%
0.0%
0.7%
0.0%
1.5%
0.0%
2.2%
100.0%
0.0%
0.4%
0.8%
3.4%
1.5%
6.0%
100.0%
0.1 %
2.7%
0.4%
2.9%
5.8%
11.9%
100.0%
SEALING METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings Wth 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%)
24.4%
20.9%
4.7%
2.1%
0.0%
15.0%
0.0%
55.1%
122.2%
22.0%
10.0%
18.0%
2.0%
0.0%
23.3%
0.0%
62.0%
137.3%
57.8%
2.8%
19.6%
10.3%
0.0%
38.2%
0.0%
31.0%
159.7%
50.9%
6.4%
26.4%
6.4%
1.8%
15.5%
0.0%
43.6%
150.9%
75.0%
4.0%
10.5%
1.6%
2.4%
67.7%
0.0%
21.8%
183.1%
45.2%
8.7%
16.5%
4.4%
0.9%
30.8%
0.0%
43.6%
150.1%
SEALI NG METHODS - SLABS
(Multiple Answers Possible)
Dwellings Wth Sabs
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%)
86.4%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
13.6%
100.0%
16.1%
0.0%
8.6%
0.0%
0.0%
8.6%
0.0%
84.0%
117.3%
95.0%
0.0%
77.7%
0.0%
0.0%
86.3%
0.0%
5.0%
264.0%
66.7%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
33.3%
100.0%
62.5%
12.5%
25.0%
0.0%
25.0%
50.0%
0.0%
25.0%
200.0%
62.9%
2.3%
20.5%
0.0%
4.6%
26.6%
0.0%
34.8%
151.6%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 14
SUBSLAB PREPARATI ON -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Sabs
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%)
96.9%
1.2%
24.2%
9.8%
31.3%
68.4%
46.9%
0.0%
1.2%
279.7%
77.9%
7.4%
14.7%
0.0%
36.4%
50.2%
84.9%
0.0%
12.6%
284.0%
79.9%
9.3%
24.4%
0.0%
26.0%
34.4%
76.4%
0.8%
8.9%
260.1%
61.1%
14.2%
9.7%
0.0%
33.6%
41.6%
60.2%
1.8%
31.0%
253.1%
72.4%
2.7%
29.6%
0.0%
41.7%
56.8%
92.4%
12.9%
6.8%
315.2%
76.7%
7.3%
19.7%
1.7%
33.9%
49.8%
72.3%
2.9%
13.1%
277.5%
SUBSLAB PREPARATI ON -- 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%)
96.6%
1.3%
18.4%
10.7%
25.2%
66.7%
42.3%
0.0%
1.3%
262.4%
66.0%
11.3%
16.7%
0.0%
10.0%
32.7%
78.0%
0.0%
19.3%
234.0%
78.3%
10.3%
26.1%
0.0%
18.0%
28.2%
74.8%
0.0%
9.3%
245.0%
60.0%
14.6%
10.0%
0.0%
33.6%
41.8%
60.9%
1.8%
31.8%
254.6%
75.4%
2.8%
25.8%
0.0%
37.9%
58.9%
92.7%
13.7%
7.3%
314.5%
74.0%
8.5%
18.8%
1.9%
24.7%
44.8%
69.8%
2.9%
15.0%
260.5%
SUBSLAB PREPARATI ON -- SLABS
(Multiple Answers Possible)
Dwellings On Sabs
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%
86.4%
0.0%
95.5%
86.4%
95.5%
0.0%
0.0%
463.6%
100.0%
0.0%
11.1%
0.0%
85.2%
82.7%
97.5%
0.0%
0.0%
376.6%
95.0%
0.0%
8.6%
0.0%
100.0%
91.4%
91.4%
8.6%
5.0%
400.0%
100.0%
0.0%
0.0%
0.0%
33.3%
33.3%
33.3%
0.0%
0.0%
200.0%
25.0%
0.0%
87.5%
0.0%
100.0%
25.0%
87.5%
0.0%
0.0%
325.0%
85.4%
0.0%
35.4%
0.0%
80.4%
63.0%
79.4%
1.5%
0.9%
346.1%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 15
COST OF PASSIVE SUB-SLAB VENTILATI ON
Sample Sze
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
18
36.7%
19.4%
1.0%
1.0%
3.1%
2.0%
36.7%
100.0%
13
51.1%
30.4%
16.3%
2.2%
0.0%
0.0%
0.0%
100.0%
14
46.1%
25.8%
23.6%
2.3%
0.0%
0.0%
2.3%
100.0%
12
20.4%
11.1%
11.1%
1.9%
0.0%
0.0%
55.6%
100.0%
22
45.1%
9.9%
31.9%
7.7%
3.3%
0.0%
2.2%
100.0%
79
43.0%
19.8%
19.9%
3.6%
1.5%
0.3%
12.0%
100.0%
COST OF ACTI VE SUB-SLAB VENTI LATI ON
Sample Sze
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
25.0%
0.0%
35.0%
0.0%
2.5%
37.5%
0.0%
100.0%
0.0%
12.5%
2.5%
25.0%
47.5%
7.5%
5.0%
100.0%
1.8%
79.0%
0.0%
19.3%
0.0%
0.0%
0.0%
100.0%
2.3%
9.1%
0.0%
4.6%
9.1%
6.8%
68.2%
100.0%
9
20.0%
0.0%
28.6%
2.9%
42.9%
5.7%
0.0%
100.0%
37
12.4%
32.1%
16.5%
9.5%
19.5%
7.5%
2.5%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 16
SAMPLE SIZE
Units
Builders
WGHTD AVERAGE UNITS PER BLDR
TYPE OF HOUSE: WITH RADON REDUCI NG FEATURES
One Story Dwellings With Basements
Wth radon reducing features
No radon reducing features
One story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
One Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATI ON -- EXCEPT R ERS
Basements
Wth radon reducing features
No radon reducing features
Crawl Spaces
Wth radon reducing features
No radon reducing features
Slabs on Grade
Wth radon reducing features
No radon reducing features
TOTAL
ALL DWELLI NGS -- EXCEPT ON R ERS
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
IA&NE
261
41
6.4
18.8%
36.0%
0.0%
1.2%
0.0%
0.0%
6.5%
37.6%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
25.3%
73.6%
0.0%
1.2%
0.0%
0.0%
100.0%
25.3%
74.7%
100.0%
KS & MO
150
40
3.8
27.3%
40.2%
0.7%
1.8%
0.0%
2.7%
3.3%
23.8%
0.0%
0.2%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
30.7%
64.0%
0.7%
2.0%
0.0%
2.7%
100.0%
31.3%
68.7%
100.0%
MN
166
39
4.3
55.0%
8.4%
1.2%
0.0%
5.0%
1.2%
19.9%
7.7%
0.0%
0.0%
0.4%
1.2%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
74.9%
16.1%
1.2%
0.0%
5.4%
2.4%
100.0%
81.5%
18.5%
100.0%
ND&SD
99
38
2.6
25.3%
51.1%
0.0%
2.2%
0.0%
2.8%
4.9%
11.3%
0.3%
0.1%
0.8%
1.3%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.1%
100.0%
30.2%
62.4%
0.3%
2.3%
0.8%
4.1%
100.0%
31.3%
68.7%
100.0%
W N CEN I
676
158
4.5
30.5%
33.2%
0.5%
1.2%
1.1%
1.5%
8.2%
22.9%
0.0%
0.1%
0.2%
0.4%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
38.8%
56.1%
0.5%
1.3%
1.3%
2.0%
100.0%
40.6%
59.4%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 17
TESTI NG OF DWELLI NGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units With Basements
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Slabs
Tested For Radon Levels
Tested Units Needing More Work
CONSTRUCTION METHOD
DWELLI NGS W TH RADON REDUCi NG FEATURES
Conventional Constructed On ate
Wth radon reducing features
No radon reducing features
Prefabricated Units (Fanelized)
Wth radon reducing features
No radon reducing features
Modular
Wth radon reducing features
No radon reducing features
ALL Dwellings
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
SIZE OF BUILDER
DWELLI NGS W TH RADON REDUCi NG FEATURES
One to Ten Dwellings Per Year
Wth radon reducing features
No radon reducing features
Eleven To Twenty-Rve Dwellings Per Year
Wth radon reducing features
No radon reducing features
Twenty-Sx To 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
CVer 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
IA&NE
39.8%
8.6%
40.3%
8.6%
0.0%
0.0%
0.0%
0.0%
10.0%
56.4%
15.3%
18.4%
0.0%
0.0%
25.3%
74.7%
100.0%
10.3%
29.9%
14.9%
6. 1 %
0.0%
13.8%
0.0%
24.9%
KS & MO
9.5%
11.2%
10.0%
11.2%
0.0%
0.0%
0.0%
0.0%
24.7%
58.0%
1.3%
10.7%
5.3%
0.0%
31.3%
68.7%
100.0%
21.3%
54.0%
10.0%
14.7%
0.0%
0.0%
0.0%
0.0%
MN
10.4%
6.9%
10.2%
7.8%
0.0%
0.0%
15.4%
0.0%
75.1%
14.8%
6.4%
3.7%
0.0%
0.0%
81.5%
18.5%
100.0%
45.1%
14.6%
12.4%
3.9%
24.1%
0.0%
0.0%
0.0%
ND&SD
18.8%
9.4%
19.6%
9.8%
6.6%
0.0%
9.8%
0.0%
31.3%
67.7%
0.0%
1.0%
0.0%
0.0%
31.3%
68.7%
100.0%
31.3%
68.7%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
WN CEN
20.4%
8.9%
21.1%
9.0%
1.2%
0.0%
10.1%
0.0%
32.2%
49.1%
6.7%
10.3%
1.8%
0.0%
40.6%
59.4%
100.0%
24.5%
39.6%
10.8%
7.7%
5.4%
4.3%
0.0%
7.8%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 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 Wth Sabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALI NG METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings Wth 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%)
SEALI NG METHODS - SLABS
(Multiple Answers Possible)
Dwellings Wth Sabs
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
29.9%
23.0%
2.3%
7.7%
36.0%
98.9%
0.0%
0.0%
0.4%
0.8%
1.2%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
8.1%
3.1%
28.7%
2.7%
0.0%
27.9%
0.0%
67.4%
138.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
KS & MO
3.3%
30.7%
0.0%
26.0%
34.7%
94.7%
0.7%
0.0%
0.0%
2.0%
2.7%
0.0%
0.0%
0.0%
0.7%
2.0%
2.7%
100.0%
43.0%
4.2%
9.2%
4.9%
0.7%
21.8%
4.2%
45.1%
133.1%
0.0%
25.0%
0.0%
0.0%
0.0%
0.0%
0.0%
75.0%
100.0%
MN
10.7%
68.4%
6.5%
1.8%
3.6%
91.0%
0.0%
1.2%
0.0%
0.0%
1.2%
0.0%
5.4%
0.0%
2.4%
0.0%
7.8%
100.0%
78.8%
2.0%
40.4%
17.9%
0.0%
36.4%
0.0%
14.6%
190.1%
76.9%
0.0%
23.1%
15.4%
0.0%
30.8%
0.0%
0.0%
146.2%
ND&SD
3.0%
29.2%
1.0%
19.6%
39.8%
92.6%
0.3%
0.0%
0.0%
2.3%
2.5%
0.0%
0.8%
0.0%
1.5%
2.5%
4.8%
100.0%
34.1%
17.3%
6.6%
5.5%
0.0%
26.1%
0.0%
59.3%
148.9%
47.7%
37.2%
0.0%
0.0%
0.0%
16.3%
0.0%
52.3%
153.5%
WN CEN
13.2%
36.5%
2.3%
14.0%
28.8%
94.9%
0.3%
0.3%
0.1%
1.2%
1.8%
0.0%
1.3%
0.0%
1.0%
1.0%
3.3%
100.0%
38.9%
5.1%
21.9%
7.2%
0.2%
27.5%
1.4%
47.1%
149.4%
34.0%
19.2%
7.5%
5.0%
0.0%
13.1%
0.0%
46.4%
125.2%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 19
SUBSLAB PREPARATI ON -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Sabs
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%)
55.8%
5.0%
1.2%
0.0%
23.6%
44.2%
40.7%
1.2%
26.0%
197.7%
76.7%
0.0%
18.5%
1.4%
2.1%
39.0%
49.3%
15.8%
8.9%
211.6%
76.2%
1.2%
30.5%
8.5%
53.1%
32.9%
76.8%
0.6%
12.2%
292.1%
60.7%
1.0%
20.7%
0.0%
24.8%
46.2%
62.8%
0.0%
12.6%
228.9%
68.0%
2.0%
16.0%
2.4%
23.1%
40.2%
54.5%
5.8%
15.5%
227.4%
SUBSLAB PREPARATI ON -- 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%)
55.8%
5.0%
1.2%
0.0%
23.6%
44.2%
40.7%
1.2%
26.0%
197.7%
76.8%
0.0%
18.3%
0.7%
2.1%
39.4%
48.6%
16.2%
9.2%
211.3%
78.8%
1.3%
27.2%
9.3%
49.0%
32.5%
76.8%
0.7%
13.3%
288.7%
61.4%
1.1%
18.6%
0.0%
22.2%
46.1%
63.6%
0.0%
11.3%
224.3%
68.6%
2.0%
14.9%
2.3%
21.9%
40.2%
54.4%
5.9%
15.6%
226.0%
SUBSLAB PREPARATI ON -- SLABS
(Multiple Answers Possible)
Dwellings On Sabs
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%
75.0%
0.0%
25.0%
25.0%
0.0%
25.0%
75.0%
0.0%
0.0%
225.0%
46.2%
0.0%
69.2%
0.0%
100.0%
38.5%
76.9%
0.0%
0.0%
330.8%
47.7%
0.0%
62.6%
0.0%
73.1 %
47.7%
47.7%
0.0%
37.4%
316.3%
60.5%
0.0%
46.5%
12.1%
46.3%
33.7%
70.4%
0.0%
7.1%
276.7%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 20
COST OF PASSIVE SUB-SLAB VENTILATI ON
Sample Sze
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
20
5.5%
51.4%
26.7%
13.0%
1.4%
0.0%
2.1%
100.0%
13
78.6%
8.9%
5.4%
1.8%
0.0%
1.8%
3.6%
100.0%
31
2.0%
6.0%
49.0%
8.0%
9.9%
9.9%
15.2%
100.0%
11
46.0%
27.0%
8.1%
0.0%
0.0%
0.0%
18.9%
100.0%
75
28.3%
17.6%
28.5%
6.4%
4.6%
4.8%
9.9%
100.0%
COST OF ACTI VE SUB-SLAB VENTI LATI ON
Sample Sze
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
10
0.0%
3.1%
55.4%
0.0%
1.5%
0.0%
40.0%
100.0%
0
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
2.8%
12.5%
2.8%
56.9%
0.0%
4.2%
20.8%
100.0%
0.0%
0.0%
0.0%
50.0%
0.0%
0.0%
50.0%
100.0%
20
1.9%
9.2%
17.5%
40.5%
0.4%
2.8%
27.7%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 21
SAMPLE SIZE
Units
Builders
W3HTD AVERAGE UNITS PER BLDR
TYPE OF HOUSE: WITH RADON REDUCI NG FEATURES
One Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
One story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
One Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATI ON -- EXCEPT R ERS
Basements
Wth radon reducing features
No radon reducing features
Crawl Spaces
Wth radon reducing features
No radon reducing features
Sabs on Grade
Wth radon reducing features
No radon reducing features
TOTAL
ALL DWELLI NGS -- EXCEPT ON R ERS
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
DE&MD
231
38
6.1
4.3%
16.3%
0.0%
1.7%
0.2%
0.2%
23.9%
28.3%
0.0%
2.5%
13.2%
2.7%
0.8%
2.1%
0.0%
0.4%
0.0%
0.0%
3.3%
100.0%
30.1%
48.2%
0.0%
4.8%
13.9%
3.0%
100.0%
44.0%
56.0%
100.0%
NOFL
189
44
4.3
0.0%
3.5%
0.0%
0.6%
1.1%
74.0%
0.0%
0.5%
0.0%
1.7%
0.0%
17.3%
0.0%
0.0%
0.0%
0.0%
0.0%
1.2%
0.0%
100.0%
0.0%
4.0%
0.0%
2.4%
1.1%
92.5%
100.0%
1.1%
98.9%
100.0%
SOFL
55
32
1.7
0.0%
0.0%
0.0%
0.0%
0.0%
48.3%
6.7%
0.0%
0.0%
1.7%
0.0%
29.2%
0.0%
0.0%
0.0%
0.0%
0.0%
5.0%
9.2%
100.0%
7.3%
0.0%
0.0%
1.8%
0.0%
90.8%
100.0%
7.3%
92.7%
100.0%
«
161
39
4.1
0.0%
3.1%
0.0%
1.9%
0.0%
32.9%
3.5%
23.9%
0.0%
1.9%
0.6%
30.5%
0.6%
1.2%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
4.1%
28.2%
0.0%
3.7%
0.6%
63.4%
100.0%
4.7%
95.3%
100.0%
NC&SC
359
58
6.2
0.7%
2.0%
0.7%
14.6%
0.3%
16.5%
1.2%
2.2%
0.5%
15.8%
0.0%
35.6%
0.3%
0.4%
0.0%
0.3%
0.0%
5.8%
3.3%
100.0%
2.2%
4.7%
1.3%
31.7%
0.3%
59.8%
100.0%
3.8%
96.2%
100.0%
VA & WV
174
38
4.6
1.2%
9.8%
0.0%
3.2%
0.0%
2.0%
46.0%
20.4%
0.6%
6.5%
0.6%
8.0%
0.0%
1.0%
0.1%
0.1%
0.0%
0.6%
0.1%
100.0%
47.2%
31.3%
0.6%
9.7%
0.6%
10.6%
100.0%
48.4%
51.6%
100.0%
SAIL 1
1168
249
4.9
0.8%
4.8%
0.2%
6.0%
0.3%
27.3%
11.2%
10.1%
0.3%
7.4%
1.5%
23.7%
0.3%
0.7%
0.0%
0.2%
0.0%
2.8%
2.4%
100.0%
12.5%
15.9%
0.5%
14.0%
1.8%
55.3%
100.0%
14.8%
85.2%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 22
TESTI NG OF DWELLI NGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Basements
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Sabs
Tested For Radon Levels
Tested Units Needing More Work
CONSTRUCTION METHOD
DWELLI NGS WITH RADON REDUCi NG FEATURES
Conventional Constructed On ate
Wth radon reducing features
No radon reducing features
Prefabricated Units (Fanelized)
Wth radon reducing features
No radon reducing features
Modular
Wth radon reducing features
No radon reducing features
ALL Dwellings
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
SIZE OF BUILDER
DWELLI NGS WITH RADON REDUCi NG FEATURES
One to Ten Dwellings Per Year
Wth radon reducing features
No radon reducing features
Seven To Twenty-Rve Dwellings Per Year
Wth radon reducing features
No radon reducing features
Twenty-Sx To 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
CVer 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
DE&MD
10.6%
8.5%
10.5%
10.9%
18.2%
0.0%
8.7%
0.0%
40.9%
51.8%
3.1%
2.9%
0.0%
1.3%
44.0%
56.0%
100.0%
16.5%
25.1%
10.8%
4.8%
16.7%
26.2%
0.0%
0.0%
NOFL
3.7%
0.0%
0.0%
0.0%
0.0%
0.0%
4.0%
0.0%
1.1%
97.1%
0.0%
0.5%
0.0%
1.3%
1.1%
98.9%
100.0%
1.1%
51.3%
0.0%
0.0%
0.0%
26.5%
0.0%
21.2%
SOFL
23.9%
0.0%
100.0%
0.0%
0.0%
0.0%
18.2%
0.0%
7.3%
92.7%
0.0%
0.0%
0.0%
0.0%
7.3%
92.7%
100.0%
7.3%
92.7%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
«
4.4%
20.3%
10.5%
23.6%
0.0%
0.0%
1.5%
8.7%
4.7%
89.1%
0.0%
6.2%
0.0%
0.0%
4.7%
95.3%
100.0%
4.7%
40.0%
0.0%
30.4%
0.0%
24.8%
0.0%
0.0%
NC&SC
15.1%
8.9%
23.8%
3.4%
9.2%
9.2%
17.4%
9.7%
3.5%
78.2%
0.3%
17.2%
0.0%
0.8%
3.8%
96.2%
100.0%
3.8%
22.1%
0.0%
7.2%
0.0%
16.7%
0.0%
50.2%
VA & WV
12.7%
4.9%
13.8%
4.7%
0.6%
0.0%
16.5%
6.3%
43.9%
51.6%
4.5%
0.0%
0.0%
0.0%
48.4%
51.6%
100.0%
16.8%
30.9%
8.6%
20.7%
0.0%
0.0%
23.0%
0.0%
SAIL
11.8%
6.6%
14.9%
7.1%
7.8%
8.4%
11.0%
6.0%
13.7%
77.4%
1.1%
7.1%
0.0%
0.6%
14.8%
85.2%
100.0%
7.1%
38.0%
2.4%
10.4%
1.7%
16.1%
3.6%
20.7%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 23
METHODS EMPLOYED TO REDUCE RADON
Dwellings Wth Basements
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - BASEMENTS
Dwellings Wth Crawl Spaces
Passive stack subslab ventilation
Fan-driven (active) ventilation
Foundation Wall Vents
None
SUBTOTAL - CRAWL SPACES
Dwellings Wth Sabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALI NG METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings Wth 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%)
SEALI NG METHODS - SLABS
(Multiple Answers Possible)
Dwellings Wth Sabs
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
31.3%
28.1%
2.0%
7.8%
9.1%
78.4%
0.0%
0.0%
0.0%
4.8%
4.8%
0.4%
13.9%
0.0%
0.9%
1.7%
16.9%
100.0%
77.4%
2.8%
8.8%
16.0%
0.0%
27.6%
0.0%
19.9%
152.5%
84.6%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
15.4%
100.0%
NOFL
0.0%
0.0%
0.0%
0.0%
4.0%
4.0%
0.0%
0.0%
0.5%
1.9%
2.4%
2.7%
1.1%
0.0%
19.1%
70.8%
93.6%
100.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
100.0%
20.4%
0.0%
4.0%
0.0%
0.0%
0.0%
0.0%
75.7%
100.0%
SOFL
0.0%
7.3%
0.0%
0.0%
0.0%
7.3%
0.0%
0.0%
0.0%
1.8%
1.8%
0.0%
0.0%
0.0%
29.4%
61.5%
90.8%
100.0%
100.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
24.2%
8.1%
12.1%
2.0%
0.0%
0.0%
0.0%
67.7%
114.1%
«
0.0%
4.1%
0.0%
13.7%
14.5%
32.3%
0.0%
0.0%
0.0%
3.7%
3.7%
0.0%
0.6%
0.0%
49.7%
13.7%
64.0%
100.0%
42.3%
1.9%
15.4%
1.9%
0.0%
0.0%
0.0%
55.8%
117.3%
75.7%
0.0%
4.9%
0.0%
0.0%
1.9%
0.0%
21.4%
103.9%
NC&SC
0.3%
2.0%
0.3%
2.2%
2.3%
7.0%
1.3%
0.0%
6.1%
25.6%
33.0%
0.6%
0.3%
0.0%
34.5%
24.8%
60. 1 %
100.0%
51.7%
16.0%
8.0%
4.0%
0.0%
0.0%
0.0%
40.4%
120.0%
30.2%
0.9%
28.6%
0.5%
0.0%
0.0%
0.0%
41.3%
101.4%
VA & WV
5.8%
47.2%
0.0%
17.6%
7.9%
78.5%
0.6%
0.1%
1.7%
8. 1 %
10.4%
0.0%
0.6%
0.0%
3.1%
7.5%
11.2%
100.0%
37. 1 %
16.1%
58.7%
5. 1 %
0.0%
21.3%
0.0%
15.2%
153.5%
27.6%
5.2%
5.2%
0.0%
0.0%
0.0%
0.0%
67.2%
105.2%
SAIL
4.1%
12.2%
0.3%
6.2%
5.6%
28.4%
0.5%
0.0%
2.5%
11.6%
14.5%
0.7%
1.8%
0.0%
25.3%
29.3%
57. 1 %
100.0%
47. 1 %
8.6%
15.0%
4.0%
0.0%
6.1%
0.0%
42. 1 %
122.9%
39.3%
1.9%
13.2%
0.4%
0.0%
0.3%
0.0%
48.2%
103.2%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 24
SUBSLAB PREPARATI ON -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Sabs
Crushed aggregate 4" or more deep 99.1%
Crushed aggregate less than 4" deep 0.5%
Sand 0.5%
Strips of geotextile drainage mat 5.0%
Sheets of rigid foam insulation 85.0%
Perforated plastic pipe 34.6%
Plastic sheet (vapor barrier) 98.6%
Other 0.0%
None 0.9%
TOTAL (may exceed 100%) 324.1%
3.8%
0.0%
40.4%
0.0%
0.5%
0.0%
71.8%
1.1%
24.2%
141.8%
22.4%
0.0%
41.1%
1.9%
0.0%
7.5%
57.0%
3.7%
5.6%
139.3%
25.8%
22.6%
39.4%
0.0%
0.0%
0.7%
91.6%
0.7%
3.2%
183.9%
29.7%
11.4%
27.6%
0.0%
5.0%
2.1%
94.6%
3.7%
0.4%
174.6%
86.0%
5.1%
15.4%
1.9%
46.2%
44.2%
94.4%
4.5%
4.8%
302.5%
40.0%
7.9%
28.0%
1.0%
17.5%
11.9%
87.1 %
2.6%
5.9%
202.0%
SUBSLAB PREPARATI ON -- 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%)
99.5%
0.0%
0.0%
6.1%
82.9%
40.9%
98.3%
0.0%
1.1%
328.7%
0.0%
0.0%
21.4%
0.0%
0.0%
0.0%
100.0%
0.0%
100.0%
221.4%
100.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
0.0%
0.0%
200.0%
59.6%
32.7%
0.0%
0.0%
0.0%
1.9%
80.8%
1.9%
5.8%
182.7%
89.8%
5.8%
0.0%
0.0%
36.0%
20.0%
88.0%
4.0%
0.0%
243.6%
89.4%
5.9%
12.2%
2.2%
43.3%
42.3%
96.5%
5.1%
5.4%
302.4%
73.0%
7.5%
5.4%
0.9%
27.4%
17.9%
92.5%
2.5%
17.9%
244.9%
SUBSLAB PREPARATI ON -- SLABS
(Multiple Answers Possible)
Dwellings On Sabs
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%)
97.4%
2.6%
2.6%
0.0%
94.9%
5.1%
100.0%
0.0%
0.0%
302.6%
4.0%
0.0%
41.2%
0.0%
0.6%
0.0%
70.6%
1.1%
20.9%
138.4%
16.2%
0.0%
44.4%
2.0%
0.0%
8.1%
53.5%
4.0%
6.1%
134.3%
8.7%
17.5%
59.2%
0.0%
0.0%
0.0%
97.1%
0.0%
1.9%
184.5%
22.7%
12.1%
30.8%
0.0%
1.4%
0.0%
95.4%
3.7%
0.5%
166.6%
62.0%
0.0%
38.0%
0.0%
67.2%
56.9%
79.3%
0.0%
0.0%
303.3%
30.7%
6.8%
36.1%
0.2%
20.5%
10.3%
85.4%
1.9%
4.4%
196.3%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 25
OOST OF PASSI VE SUB-SLAB VENTI LATI ON
Sample Sze
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
20
18.3%
13.0%
25.2%
37.4%
2.6%
0.0%
3.5%
100.0%
NOFL
6
33.3%
33.3%
0.0%
33.3%
0.0%
0.0%
0.0%
100.0%
SOFL
11
57.9%
10.5%
31.6%
0.0%
0.0%
0.0%
0.0%
100.0%
«
5
3.3%
26.7%
0.0%
3.3%
0.0%
0.0%
66.7%
100.0%
NC&SC
16
9.0%
7.7%
2.6%
1.3%
5.1%
73. 1 %
1.3%
100.0%
VA & WV
20
8.0%
64.6%
19.5%
5.3%
2.7%
0.0%
0.0%
100.0%
SAIL
78
13.6%
40.4%
19.2%
14.1%
2.6%
6.0%
4. 1 %
100.0%
OOST OF ACTI VE SUB-SLAB VENTI LATI ON
Sample Sze
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
2.3%
0.0%
0.0%
2.3%
0.0%
2.3%
93.0%
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%
50.0%
0.0%
0.0%
25.0%
0.0%
0.0%
25.0%
100.0%
62.3%
7.3%
26.1%
0.0%
4.4%
0.0%
0.0%
100.0%
16
19.6%
0.3%
0.9%
9.4%
0.2%
1.5%
68.1 %
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 26
SAMPLE SIZE
Units
Builders
W3HTD AVERAGE UNITS PER BLDR
TYPE OF HOUSE: WITH RADON REDUCI NG FEATURES
One Story Dwellings With Basements
Wth radon reducing features
No radon reducing features
One story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
One Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATI ON -- EXCEPT R ERS
Basements
Wth radon reducing features
No radon reducing features
Crawl Spaces
Wth radon reducing features
No radon reducing features
Slabs on Grade
Wth radon reducing features
No radon reducing features
TOTAL
ALL DWELLI NGS -- EXCEPT ON R ERS
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
AL & MS
260
37
7.0
2.6%
3.0%
0.0%
2.5%
1.5%
79.7%
0.8%
0.5%
0.0%
0.8%
0.0%
5.4%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
3.2%
100.0%
3.6%
3.6%
0.0%
3.4%
1.5%
87.9%
100.0%
5.1%
94.9%
100.0%
KY&TN
151
35
4.3
4.5%
15.3%
6.7%
14.1%
6.6%
21.5%
1.9%
8.9%
0.3%
6.4%
0.0%
12.5%
0.4%
0.0%
0.1%
0.0%
0.0%
0.0%
0.7%
100.0%
6.9%
24.4%
7.2%
20.7%
6.6%
34.3%
100.0%
20.6%
79.4%
100.0%
ESCEN
410
72
5.5
3.7%
10.1%
3.9%
9.2%
4.4%
46.2%
1.4%
5.3%
0.1%
4.1%
0.0%
9.5%
0.2%
0.0%
0.1%
0.0%
0.0%
0.0%
1.7%
100.0%
5.5%
15.6%
4.1%
13.4%
4.5%
57.0%
100.0%
14.1%
85.9%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 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 Wth Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Slabs
Tested For Radon Levels
Tested Units Needing More Work
0.7%
0.0%
10.3%
0.0%
0.0%
0.0%
0.0%
0.0%
6.2%
21.2%
9.6%
22.1%
9.3%
25.4%
1.6%
0.0%
3.9%
19.6%
9.7%
18.8%
8.5%
25.4%
0.6%
0.0%
CONSTRUCTION METHOD
DWELLI NGS W TH RADON REDUCi NG FEATURES
Conventional Constructed On ate
Wth radon reducing features
No radon reducing features
Prefabricated Units (Fanelized)
Wth radon reducing features
No radon reducing features
Modular
Wth radon reducing features
No radon reducing features
ALL Dwellings
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
3.7%
83.0%
1.4%
11.9%
0.0%
0.0%
5.1%
94.9%
100.0%
20.6%
70.7%
0.0%
3.4%
0.0%
5.3%
20.6%
79.4%
100.0%
13.5%
75.9%
0.6%
7.0%
0.0%
3.1%
14.1%
85.9%
100.0%
SIZE OF BUILDER
DWELLI NGS W TH RADON REDUCi NG FEATURES
One to Ten Dwellings Per Year
Wth radon reducing features
No radon reducing features
Seven To Twenty-Rve Dwellings Per Year
Wth radon reducing features
No radon reducing features
Twenty-Sx To 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
Over 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
5.1%
19.8%
0.0%
13.5%
0.0%
61.7%
0.0%
0.0%
20.6%
62.8%
0.0%
16.6%
0.0%
0.0%
0.0%
0.0%
14.1%
44.6%
0.0%
15.3%
0.0%
26.1%
0.0%
0.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 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 Wth Sabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALI NG METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings Wth 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%)
SEALI NG METHODS - SLABS
(Multiple Answers Possible)
Dwellings Wth Sabs
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%
2.6%
1.0%
1.9%
1.6%
7.1%
0.0%
0.0%
0.0%
3.4%
3.4%
0.0%
1.5%
0.0%
52.9%
35.1%
89.5%
100.0%
27.0%
5.4%
5.4%
0.0%
0.0%
0.0%
0.0%
73.0%
110.8%
60.8%
0.0%
0.9%
0.4%
0.0%
0.0%
0.0%
39.2%
101.3%
KY&TN
3.4%
6.2%
0.7%
9.7%
11.3%
31.3%
7.2%
0.0%
10.6%
10.1%
27.9%
9.8%
6.6%
0.0%
18.5%
6.0%
40.9%
100.0%
64.0%
2. 1 %
29.7%
0.0%
0.0%
4.2%
0.0%
36.0%
136.0%
83.8%
0.0%
1.6%
0.0%
0.0%
1.6%
0.0%
16.2%
103.2%
ESCEN
2.0%
4.7%
0.8%
6.4%
7.2%
21.0%
4.1%
0.0%
6.1%
7.3%
17.5%
5.7%
4.5%
0.0%
33.1%
18.3%
61.5%
100.0%
48.3%
3.5%
19.4%
0.0%
0.0%
2.4%
0.0%
51.7%
125.3%
74.0%
0.0%
1.3%
0.2%
0.0%
0.9%
0.0%
26.0%
102.4%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 29
SUBSLAB PREPARATI ON -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Sabs
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%)
23.6%
9.6%
25.3%
2.0%
1.6%
0.0%
67.2%
12.4%
1.8%
143.5%
68.8%
1.8%
1.8%
0.0%
25.6%
24.7%
94.5%
0.0%
3.7%
220.9%
49.6%
5.1%
11.8%
0.8%
15.4%
14.2%
82.9%
5.2%
2.9%
188.1%
SUBSLAB PREPARATI ON -- 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%)
86.5%
0.0%
13.5%
0.0%
5.4%
0.0%
94.6%
0.0%
13.5%
213.5%
91.5%
4.2%
2.1%
0.0%
30.1%
44.9%
89.4%
0.0%
8.5%
270.7%
89.4%
2.4%
6.9%
0.0%
19.6%
25.9%
91.6%
0.0%
10.6%
246.5%
SUBSLAB PREPARATI ON -- SLABS
(Multiple Answers Possible)
Dwellings On Sabs
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%)
18.6%
10.3%
26.3%
2.2%
1.3%
0.0%
65.0%
13.4%
0.9%
137.9%
51.4%
0.0%
1.6%
0.0%
22.2%
9.2%
98.4%
0.0%
0.0%
182.8%
37.5%
4.4%
12.1%
0.9%
13.3%
5.3%
84.2%
5.7%
0.4%
163.8%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 30
OOST OF PASSI VE SUB-SLAB VENTI LATI ON
Sample Sze
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
AL & MS
4
100.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
KY&TN
16
70.8%
4.2%
25.0%
0.0%
0.0%
0.0%
0.0%
100.0%
ESCEN
20
74.7%
3.6%
21.7%
0.0%
0.0%
0.0%
0.0%
100.0%
OOST OF ACTI VE SUB-SLAB VENTI LATI ON
Sample Sze
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
1
100.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
0.0%
0.0%
0.0%
64.3%
28.6%
7.1%
0.0%
100.0%
51.7%
0.0%
0.0%
31.1%
13.8%
3.4%
0.0%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 31
SAMPLE SIZE
Units
Builders
WGHTD AVERAGE UNITS PER BLDR
TYPE OF HOUSE: WITH RADON REDUCI NG FEATURES
One Story Dwellings With Basements
Wth radon reducing features
No radon reducing features
One story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
One Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATI ON -- EXCEPT R ERS
Basements
Wth radon reducing features
No radon reducing features
Crawl Spaces
Wth radon reducing features
No radon reducing features
Slabs on Grade
Wth radon reducing features
No radon reducing features
TOTAL
ALL DWELLI NGS -- EXCEPT ON R ERS
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
AR & OK
228
41
5.6
0.0%
1.8%
0.0%
2.2%
1.3%
69.1%
0.4%
1.8%
0.0%
0.9%
0.0%
21.9%
0.4%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
0.9%
3.7%
0.0%
3.1%
1.3%
91.1%
100.0%
2.2%
97.8%
100.0%
LA & E TX
453
41
11.0
0.0%
0.1%
0.0%
0.0%
0.0%
69.6%
0.0%
0.0%
0.0%
0.0%
0.0%
26.5%
0.0%
0.1%
0.0%
0.0%
0.0%
0.5%
3.2%
100.0%
0.0%
0.2%
0.0%
0.0%
0.0%
99.8%
100.0%
0.0%
100.0%
100.0%
WTX
637
39
16.3
0.0%
0.0%
0.0%
0.0%
0.4%
54.3%
0.0%
0.2%
0.0%
0.3%
1.9%
42.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.2%
0.8%
100.0%
0.0%
0.2%
0.0%
0.3%
2.4%
97.2%
100.0%
2.4%
97.7%
100.0%
W S CEN I
1318
121
12.7
0.0%
0.3%
0.0%
0.3%
0.3%
62.7%
0.1%
0.3%
0.0%
0.3%
0.9%
32.7%
0.1%
0.0%
0.0%
0.0%
0.0%
0.3%
1.7%
100.0%
0.1%
0.6%
0.0%
0.5%
1.2%
97.5%
100.0%
1.3%
98.7%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 32
TESTI NG OF DWELLI NGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units With Basements
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Slabs
Tested For Radon Levels
Tested Units Needing More Work
CONSTRUCTION METHOD
DWELLI NGS W TH RADON REDUCi NG FEATURES
Conventional Constructed On ate
Wth radon reducing features
No radon reducing features
Prefabricated Units (Fanelized)
Wth radon reducing features
No radon reducing features
Modular
Wth radon reducing features
No radon reducing features
ALL Dwellings
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
SIZE OF BUILDER
DWELLI NGS W TH RADON REDUCi NG FEATURES
One to Ten Dwellings Per Year
Wth radon reducing features
No radon reducing features
Eleven To Twenty-Rve Dwellings Per Year
Wth radon reducing features
No radon reducing features
Twenty-Sx To 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
Over 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
AR & OK
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
2.2%
96.8%
0.0%
1.0%
0.0%
0.0%
2.2%
97.8%
100.0%
2.2%
42.1%
0.0%
18.9%
0.0%
12.7%
0.0%
24.1%
LA & E TX
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%
0.0%
100.0%
100.0%
0.0%
26.3%
0.0%
15.2%
0.0%
24.3%
0.0%
34.2%
WTX
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
2.4%
69.5%
0.0%
28.1%
0.0%
0.0%
2.4%
97.7%
100.0%
0.0%
13.2%
0.0%
6.8%
2.4%
29.0%
0.0%
48.7%
WSCEN
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
1.3%
86.1%
0.0%
12.6%
0.0%
0.0%
1.3%
98.7%
100.0%
0.3%
22.5%
0.0%
11.9%
1.0%
24.9%
0.0%
39.3%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 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 Wth Sabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALI NG METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings Wth 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%)
SEALI NG METHODS - SLABS
(Multiple Answers Possible)
Dwellings Wth Sabs
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%
0.9%
1.8%
1.9%
4.6%
0.0%
0.0%
0.9%
2.2%
3.1%
0.0%
1.3%
0.0%
3.1%
88.0%
92.4%
100.0%
48.1%
19.3%
28.9%
0.0%
0.0%
0.0%
0.0%
42.3%
138.5%
4.8%
0.5%
2.4%
0.0%
0.0%
0.0%
0.0%
95.3%
102.9%
LA & E TX
0.0%
0.0%
0.0%
0.2%
0.0%
0.2%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
45.3%
54.5%
99.8%
100.0%
100.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
45.4%
0.0%
4.7%
0.0%
0.0%
0.0%
0.0%
54.7%
104.7%
WTX
0.0%
0.0%
0.0%
0.2%
0.0%
0.2%
0.0%
0.0%
0.0%
0.3%
0.3%
0.0%
2.4%
0.0%
10.5%
86.7%
99.5%
100.0%
100.0%
100.0%
0.0%
0.0%
100.0%
0.0%
0.0%
0.0%
300.0%
12.9%
0.0%
0.3%
0.0%
0.0%
9.5%
0.0%
87.1%
109.8%
WSCEN
0.0%
0.0%
0.1%
0.4%
0.3%
0.8%
0.0%
0.0%
0.1%
0.4%
0.5%
0.0%
1.2%
0.0%
24.3%
73.2%
98.7%
100.0%
93.2%
46.9%
3.8%
0.0%
44.4%
0.0%
0.0%
5.6%
193.8%
25.6%
0.1%
2.4%
0.0%
0.0%
4.2%
0.0%
74.4%
106.7%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 34
SUBSLAB PREPARATI ON -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Sabs
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%)
28.5%
2.7%
58.4%
0.5%
3.6%
1.8%
34.4%
1.4%
2.0%
133.2%
4.9%
4.6%
74.2%
0.0%
0.0%
18.8%
47.7%
1.6%
0.2%
151.9%
51.5%
0.0%
34.3%
0.0%
9.5%
0.0%
91.7%
0.9%
2.2%
190.1%
28.7%
2.3%
54.4%
0.1%
4.7%
8.2%
65.4%
1.3%
1.3%
166.4%
SUBSLAB PREPARATI ON -- 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%)
57.8%
19.3%
23.0%
9.6%
28.9%
28.9%
77.0%
0.0%
23.0%
267.4%
100.0%
0.0%
100.0%
0.0%
0.0%
100.0%
100.0%
0.0%
0.0%
400.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
100.0%
50.1%
2.5%
45.5%
1.3%
3.8%
46.3%
52.6%
0.0%
47.4%
249.5%
SUBSLAB PREPARATI ON -- SLABS
(Multiple Answers Possible)
Dwellings On Sabs
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%)
27.1%
1.9%
60.1%
0.0%
2.4%
0.5%
32.3%
1.4%
1.0%
126.6%
4.7%
4.7%
74.1%
0.0%
0.0%
18.6%
47.6%
1.6%
0.2%
151.3%
51.6%
0.0%
34.4%
0.0%
9.5%
0.0%
91.8%
1.0%
2.1%
190.2%
28.4%
2.2%
54.7%
0.0%
4.5%
8.0%
65.2%
1.3%
1.1%
165.3%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 35
COST OF PASSIVE SUB-SLAB VENTILATI ON
Sample Sze
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
25.0%
75.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
0
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
89.3%
10.7%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
COST OF ACTI VE SUB-SLAB VENTI LATI ON
Sample Sze
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%
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%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 36
SAMPLE SIZE
Units
Builders
W3HTD AVERAGE UNITS PER BLDR
TYPE OF HOUSE: WITH RADON REDUCI NG FEATURES
One Story Dwellings With Basements
Wth radon reducing features
No radon reducing features
One story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
One Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATI ON -- EXCEPT R ERS
Basements
Wth radon reducing features
No radon reducing features
Crawl Spaces
Wth radon reducing features
No radon reducing features
Slabs on Grade
Wth radon reducing features
No radon reducing features
TOTAL
ALL DWELLI NGS -- EXCEPT ON R ERS
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
AZ&NM&NV
268
40
6.7
0.0%
1.0%
0.4%
2.3%
0.7%
40.6%
0.0%
0.0%
0.0%
2.6%
0.0%
45.3%
0.0%
1.1%
0.0%
0.0%
0.0%
5.8%
0.3%
100.0%
0.0%
2. 1 %
0.4%
4.9%
0.8%
91.9%
100.0%
1.1%
98.9%
100.0%
CO&UT
238
36
6.6
0.8%
50.5%
1.0%
0.0%
2.1%
1.3%
1.6%
36.2%
4.8%
0.0%
0.0%
0.0%
0.1%
0.5%
0.0%
0.0%
0.4%
0.0%
0.6%
100.0%
2.5%
87.8%
5.9%
0.0%
2.5%
1.3%
100.0%
11.0%
89.1%
100.0%
I D & MT & WY
120
40
3.0
7.3%
10.5%
3.3%
38.4%
0.0%
0.9%
3.8%
5.0%
1.7%
4.6%
0.9%
3.5%
0.0%
0.1%
0.0%
0.0%
0.0%
0.0%
20.0%
100.0%
13.8%
19.4%
6.4%
53.8%
1.2%
5.5%
100.0%
21.3%
78.7%
100.0%
MTN I
626
116
6.1
1.4%
20.4%
1.1%
7.2%
1.1%
20.1%
1.2%
13.9%
2.0%
2.0%
0.1%
22.3%
0.0%
0.7%
0.0%
0.0%
0.2%
2.8%
3.5%
100.0%
3.1%
35.9%
3.3%
10.8%
1.5%
45.4%
100.0%
7.9%
92.1%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 37
TESTI NG OF DWELLI NGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units With Basements
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Slabs
Tested For Radon Levels
Tested Units Needing More Work
CONSTRUCTION METHOD
DWELLI NGS W TH RADON REDUCi NG FEATURES
Conventional Constructed On ate
Wth radon reducing features
No radon reducing features
Prefabricated Units (Fanelized)
Wth radon reducing features
No radon reducing features
Modular
Wth radon reducing features
No radon reducing features
ALL Dwellings
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
SIZE OF BUILDER
DWELLI NGS W TH RADON REDUCi NG FEATURES
One to Ten Dwellings Per Year
Wth radon reducing features
No radon reducing features
Eleven To Twenty-Rve Dwellings Per Year
Wth radon reducing features
No radon reducing features
Twenty-Sx To 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
CVer 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
AZ&NM&NV
1.1%
0.0%
18.0%
0.0%
7.0%
0.0%
0.4%
0.0%
1.1%
88.7%
0.0%
10.1%
0.0%
0.0%
1.1%
98.9%
100.0%
1.1%
20.2%
0.0%
4.5%
0.0%
51.8%
0.0%
22.4%
CO&UT
8.6%
2.7%
6.8%
3.8%
7.1%
0.0%
55.6%
0.0%
11.0%
88.2%
0.0%
0.8%
0.0%
0.0%
11.0%
89.1%
100.0%
11.0%
15.0%
0.0%
23.6%
0.0%
29.5%
0.0%
21.1%
I D & MT & WY
18.8%
13.3%
33.6%
16.6%
11.4%
5.0%
11.3%
40.0%
15.9%
75.6%
5.4%
3.0%
0.0%
0.0%
21.3%
78.7%
100.0%
18.0%
40.3%
3.3%
9.2%
0.0%
0.0%
0.0%
29.2%
MTN
6.6%
6.6%
10.0%
8.4%
9.8%
3.6%
2.2%
3.7%
7.0%
86.5%
0.9%
5.6%
0.0%
0.0%
7.9%
92.1%
100.0%
7.3%
21.5%
0.5%
12.1%
0.0%
35.6%
0.0%
23.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 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 Wth Sabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALI NG METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings Wth 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%)
SEALI NG METHODS - SLABS
(Multiple Answers Possible)
Dwellings Wth Sabs
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
0.4%
0.0%
0.0%
0.2%
1.5%
2.1%
0.4%
0.0%
0.8%
4.2%
5.3%
0.0%
0.8%
0.0%
19.1%
72.8%
92.6%
100.0%
18.0%
0.0%
27.9%
18.0%
0.0%
0.0%
0.0%
72.1%
136.1%
20.5%
0.0%
1.3%
0.0%
0.0%
0.0%
0.0%
78.6%
100.4%
CO&UT
0.8%
1.5%
1.1%
3.2%
83.8%
90.3%
5.9%
0.0%
0.0%
0.0%
5.9%
0.0%
2.5%
0.0%
0.8%
0.4%
3.8%
100.0%
3.3%
1.4%
0.9%
0.0%
0.5%
0.0%
0.5%
94.9%
101.4%
0.0%
0.0%
22.2%
0.0%
0.0%
0.0%
0.0%
77.8%
100.0%
I D & MT & WY
3.6%
10.7%
3.1%
8.3%
7.5%
33.2%
3.0%
3.3%
5.0%
48.8%
60.1%
0.1%
0.4%
0.8%
3.3%
2.1%
6.6%
100.0%
37.6%
32.6%
2.2%
7.5%
0.0%
10.0%
0.0%
35.1%
125.1%
62.8%
12.6%
6.3%
12.6%
0.0%
0.0%
0.0%
30.9%
125.1%
MTN
1.0%
2.2%
0.9%
2.6%
32.3%
39.0%
2.8%
0.5%
1.1%
9.7%
14.1%
0.0%
1.3%
0.1%
10.0%
35.4%
46.9%
100.0%
15.8%
5.6%
14.1%
9.8%
0.2%
1.6%
0.2%
74.6%
121.8%
19.7%
2.0%
9.7%
2.0%
0.0%
0.0%
0.0%
70.8%
104.1%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 39
AZ&NM&NV
I D & MT & WY
SUBSLAB PREPARATI ON -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Sabs
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%)
95.5%
0.8%
8.7%
0.4%
2.0%
0.8%
60.2%
11.0%
3.8%
183.2%
28.2%
2.7%
0.0%
0.5%
31.1%
26.4%
22.8%
0.5%
46.8%
158.9%
95.8%
2.1%
6.3%
12.5%
43.9%
62.7%
71.1%
0.0%
7.3%
301.7%
71.2%
1.7%
5.1%
2.3%
19.1%
19.8%
48.4%
5.5%
19.9%
193.0%
SUBSLAB PREPARATI ON -- 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%)
100.0%
0.0%
0.0%
18.0%
0.0%
18.0%
18.0%
0.0%
82.0%
236.1%
26.6%
2.8%
0.0%
0.5%
32.4%
27.5%
23.8%
0.5%
47.3%
161.3%
95.0%
2.5%
0.0%
12.5%
40.1%
62.7%
72.7%
0.0%
7.5%
293.1%
72.6%
1.4%
0.0%
10.8%
18.1%
28.5%
28.7%
0.2%
57.7%
217.9%
SUBSLAB PREPARATI ON -- SLABS
(Multiple Answers Possible)
Dwellings On Sabs
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%)
95.4%
0.8%
8.9%
0.0%
2.0%
0.4%
61.2%
11.3%
2.0%
182.0%
66.7%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
33.3%
100.0%
100.0%
0.0%
37.7%
12.6%
62.8%
62.8%
62.8%
0.0%
6.3%
345.0%
85.7%
0.4%
10.2%
2.0%
10.8%
10.1%
39.2%
5.4%
14.1%
177.9%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 40
COST OF PASSI VE SUB-SLAB VENTI LATI ON
Sample Sze
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
AZ&NM&NV
6
91.7%
0.0%
0.0%
0.0%
8.3%
0.0%
0.0%
100.0%
CO&UT
11
70.2%
8.5%
9.6%
2.1%
0.0%
3.2%
6.4%
100.0%
I D & MT & WY
15
45.2%
14.3%
21.4%
0.0%
14.3%
0.0%
4.8%
100.0%
MTN
32
63.3%
9.8%
12.9%
1.2%
5.7%
1.8%
5.3%
100.0%
COST OF ACTI VE SUB-SLAB VENTI LATI ON
Sample Sze
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%
59.3%
3.7%
0.0%
0.0%
3.7%
0.0%
33.3%
100.0%
7
17.2%
0.0%
0.0%
13.8%
0.0%
55.2%
13.8%
100.0%
13
27.9%
0.9%
0.0%
10.3%
0.9%
41.2%
18.7%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 41
SAMPLE SIZE
Units
Builders
W3HTD AVERAGE UNITS PER BLDR
TYPE OF HOUSE: WITH RADON REDUCI NG FEATURES
One Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
One story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
One Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATI ON -- EXCEPT R ERS
Basements
Wth radon reducing features
No radon reducing features
Crawl Spaces
Wth radon reducing features
No radon reducing features
Slabs on Grade
Wth radon reducing features
No radon reducing features
TOTAL
ALL DWELLI NGS -- EXCEPT ON R ERS
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
NCA
416
41
10.1
0.0%
5.1%
0.0%
4.9%
0.0%
56.3%
0.2%
5.4%
0.0%
3.0%
0.0%
24.6%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.5%
100.0%
0.2%
10.6%
0.0%
7.9%
0.0%
81.3%
100.0%
0.2%
99.8%
100.0%
SCA&HI
571
38
15.0
0.0%
1.9%
0.0%
0.3%
0.0%
46.4%
0.0%
0.0%
0.0%
1.9%
0.0%
49.3%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.2%
100.0%
0.0%
1.9%
0.0%
2.3%
0.0%
95.9%
100.0%
0.0%
100.0%
100.0%
«
100
37
2.7
0.0%
3.6%
2.5%
33.7%
0.0%
0.0%
0.0%
6.2%
0.3%
46.0%
0.0%
1.9%
0.0%
1.3%
0.0%
0.7%
0.0%
1.0%
2.9%
100.0%
0.0%
11.3%
2.9%
82.8%
0.0%
3.0%
100.0%
2.9%
97.1%
100.0%
WA & AK
139
40
3.5
1.4%
6.7%
3.3%
29.8%
0.0%
2.8%
2.1%
17.4%
1.4%
17.6%
0.0%
14.0%
0.0%
0.0%
0.0%
0.3%
0.0%
0.3%
2.8%
100.0%
3.6%
24.8%
4.9%
49.1%
0.0%
17.6%
100.0%
8.5%
91.6%
100.0%
PAC 1
1226
156
8.7
0.5%
4.4%
1.4%
14.7%
0.0%
29.4%
0.7%
7.6%
0.5%
12.2%
0.0%
26.6%
0.0%
0.1%
0.0%
0.2%
0.0%
0.2%
1.4%
100.0%
1.2%
12.5%
1.9%
27.9%
0.0%
56.5%
100.0%
3.1%
96.9%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 42
TESTI NG OF DWELLI NGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Basements
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Slabs
Tested For Radon Levels
Tested Units Needing More Work
CONSTRUCTION METHOD
DWELLI NGS W TH RADON REDUCi NG FEATURES
Conventional Constructed On ate
Wth radon reducing features
No radon reducing features
Prefabricated Units (Fanelized)
Wth radon reducing features
No radon reducing features
Modular
Wth radon reducing features
No radon reducing features
ALL Dwellings
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
SIZE OF BUILDER
DWELLI NGS W TH RADON REDUCi NG FEATURES
One to Ten Dwellings Per Year
Wth radon reducing features
No radon reducing features
Eleven To Twenty-Rve Dwellings Per Year
Wth radon reducing features
No radon reducing features
Twenty-Sx To 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
CVer 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
NCA
1.7%
0.0%
2.2%
0.0%
6.1%
0.0%
1.2%
0.0%
0.0%
97.3%
0.2%
2.4%
0.0%
0.1%
0.2%
99.8%
100.0%
0.2%
15.6%
0.0%
0.0%
0.0%
49.5%
0.0%
34.6%
SCA&HI
0.5%
0.0%
0.0%
0.0%
7.8%
0.0%
0.4%
0.0%
0.0%
99.2%
0.0%
0.8%
0.0%
0.0%
0.0%
100.0%
100.0%
0.0%
12.1%
0.0%
4.0%
0.0%
48.9%
0.0%
35.0%
«
1.0%
0.0%
0.0%
0.0%
1.2%
0.0%
0.0%
0.0%
2.9%
96.5%
0.0%
0.0%
0.0%
0.6%
2.9%
97.1%
100.0%
2.9%
75.1%
0.0%
22.0%
0.0%
0.0%
0.0%
0.0%
WA & AK
3.4%
0.0%
8.4%
0.0%
1.9%
0.0%
0.0%
0.0%
7.7%
77.2%
0.7%
14.4%
0.0%
0.0%
8.5%
91.6%
100.0%
8.5%
52.7%
0.0%
14.4%
0.0%
24.5%
0.0%
0.0%
PAC
1.8%
0.0%
6.0%
0.0%
2.1%
0.0%
0.6%
0.0%
2.8%
91.3%
0.3%
5.5%
0.0%
0.1%
3.1%
96.9%
100.0%
3.1%
33.2%
0.0%
8.4%
0.0%
35.6%
0.0%
19.6%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 43
METHODS EMPLOYED TO REDUCE RADON
Dwellings Wth Basements
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - BASEMENTS
Dwellings Wth Crawl Spaces
Passive stack subslab ventilation
Fan-driven (active) ventilation
Foundation Wall Vents
None
SUBTOTAL - CRAWL SPACES
Dwellings Wth Sabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALI NG METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings Wth 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%)
SEALI NG METHODS - SLABS
(Multiple Answers Possible)
Dwellings Wth Sabs
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
1.4%
0.2%
0.0%
8.6%
0.6%
10.8%
0.0%
0.0%
0.7%
7.2%
7.9%
0.0%
0.0%
0.0%
66.5%
14.8%
81.3%
100.0%
73.5%
7.4%
6.4%
0.0%
0.0%
0.0%
0.0%
18.6%
105.9%
80.0%
1.6%
13.0%
0.0%
0.0%
0.0%
0.0%
18.2%
112.7%
SCA&HI
0.0%
0.0%
0.0%
0.9%
1.1%
1.9%
0.0%
0.0%
1.8%
0.5%
2.3%
0.0%
0.0%
0.0%
21.8%
74.1%
95.9%
100.0%
44.7%
18.4%
18.4%
0.0%
0.0%
0.0%
0.0%
55.3%
136.8%
22.4%
0.2%
0.6%
0.0%
0.0%
0.0%
0.0%
77.3%
100.4%
«
0.0%
0.0%
0.0%
4.0%
7.3%
11.3%
1.9%
1.0%
46.2%
36.6%
85.7%
0.0%
0.0%
0.0%
2.0%
1.0%
3.0%
100.0%
26.5%
8.8%
0.0%
8.8%
0.0%
8.8%
0.0%
64.7%
117.6%
66.7%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
33.3%
100.0%
WA & AK
0.0%
2.9%
0.7%
15.8%
9.0%
28.4%
2.0%
2.9%
4.1%
45.0%
54.0%
0.0%
0.0%
0.0%
11.5%
6.1%
17.6%
100.0%
55.7%
5. 1 %
2.5%
0.0%
0.0%
0.0%
5.1%
41.8%
110.1%
65.3%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
34.7%
100.0%
PAC
0.3%
1.0%
0.2%
7.9%
4.2%
13.7%
0.9%
1.0%
7.3%
20.6%
29.8%
0.0%
0.0%
0.0%
27.0%
29.5%
56.5%
100.0%
53.2%
10.4%
8.3%
1.0%
0.0%
1.0%
1.6%
43.1%
118.6%
55.2%
0.4%
3.3%
0.0%
0.0%
0.0%
0.0%
44.3%
103.2%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 44
SUBSLAB FREPARATI ON -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Sabs
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
Rastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
SUBSLAB PREPARATI ON -- 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
Rastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
SUBSLAB PREPARATI ON -- SLABS
(Multiple Answers Possible)
Dwellings On Sabs
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
Rastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
NCA
37.0%
40.9%
61.6%
1.5%
1.6%
1.7%
95.7%
10.2%
10.5%
260.6%
19.6%
53.1%
59.0%
3.7%
2.2%
5.9%
70.5%
2.2%
86.3%
302.7%
39.3%
39.3%
61.9%
1.2%
1.5%
1.2%
99.0%
11.2%
0.4%
255.0%
SCA&HI
26.7%
0.0%
74.7%
0.0%
0.7%
1.3%
57.2%
19.7%
3.2%
183.5%
44.7%
0.0%
9.2%
0.0%
0.0%
18.4%
54.0%
0.0%
72.4%
198.7%
26.4%
0.0%
76.0%
0.0%
0.7%
0.9%
57.3%
20.1%
1.8%
183.2%
«
69.8%
0.0%
14.0%
20.9%
72.1%
34.9%
55.8%
0.0%
20.9%
288.4%
79.4%
0.0%
8.8%
17.7%
73.5%
35.3%
52.9%
0.0%
17.7%
285.3%
33.3%
0.0%
33.3%
33.3%
66.7%
33.3%
66.7%
0.0%
33.3%
300.0%
WA & AK
64.1%
6.3%
15.6%
1.6%
67.2%
4.7%
46.9%
0.0%
21.9%
228.1%
70.9%
10.1%
15.2%
2.5%
65.8%
5.1%
48.1%
0.0%
16.5%
234.2%
53.1%
0.0%
16.3%
0.0%
69.4%
4.1%
44.9%
0.0%
30.6%
218.4%
PAC
46.1%
11.9%
45.6%
3.2%
30.5%
6.3%
63.0%
8.8%
13.0%
228.4%
51.1%
16.1%
23.1%
3.7%
30.1%
13.0%
55.9%
0.5%
51.5%
245.0%
38.9%
9.5%
48.5%
4.0%
30.6%
5.7%
64.4%
9.2%
14.3%
225.1%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 45
COST OF PASSIVE SUB-SLAB VENTILATI ON
Sample Sze
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
30.0%
0.0%
60.0%
0.0%
0.0%
0.0%
10.0%
100.0%
0
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
1
100.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
7
46.2%
7.7%
30.8%
15.4%
0.0%
0.0%
0.0%
100.0%
13
51.9%
6.6%
28.1%
13.1%
0.0%
0.0%
0.3%
100.0%
COST OF ACTI VE SUB-SLAB VENTI LATI ON
Sample Sze
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%
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%
87.2%
0.0%
0.0%
0.0%
10.3%
2.6%
0.0%
100.0%
87.2%
0.0%
0.0%
0.0%
10.3%
2.6%
0.0%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 46
SAMPLE SIZE
Units
Builders
W3HTD AVERAGE UNITS PER BLDR
NEW ENG
281
91
3.1
Ml D ATL
674
117
5.9
ENCEN
915
198
4.6
W N CEN
676
158
4.5
SAIL
1168
249
4.9
ESCEN
410
72
5.5
W S CEN
1318
121
12.7
MTN
626
116
6.1
PAC
1226
156
8.7
US TOTAL I
7294
1278
6.9
TYPE OF HOUSE: WITH RADON REDUCI NG FEATURES
One Story Dwellings With Basements
Wth radon reducing features
No radon reducing features
One story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
One Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATI ON -- EXCEPT R ERS
Basements
Wth radon reducing features
No radon reducing features
Crawl Spaces
Wth radon reducing features
No radon reducing features
Sabs on Grade
Wth radon reducing features
No radon reducing features
TOTAL
ALL DWELLI NGS -- EXCEPT ON R ERS
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
2.4%
15.4%
0.0%
0.8%
0.8%
2.1%
14.2%
58.4%
0.0%
1.1%
0.4%
1.7%
0.4%
0.7%
0.0%
0.0%
0.0%
0.0%
1.6%
100.0%
17.3%
75.8%
0.0%
1.9%
1.2%
3.8%
100.0%
18.5%
81.5%
100.0%
16.6%
9.6%
4.3%
0.5%
3.4%
0.6%
24.0%
37.2%
0.5%
0.4%
0.4%
0.0%
0.0%
2.4%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
40.6%
49.3%
4.8%
1.0%
3.9%
0.6%
100.0%
49.2%
50.8%
100.0%
19.6%
26.9%
1.6%
4.7%
2.3%
7.8%
10.4%
22.8%
0.0%
1.7%
0.8%
0.9%
0.0%
0.5%
0.0%
0.0%
0.0%
0.1%
0.0%
100.0%
30.0%
50.1%
1.6%
6.4%
3.1%
8.8%
100.0%
34.7%
65.3%
100.0%
30.5%
33.2%
0.5%
1.2%
1.1%
1.5%
8.2%
22.9%
0.0%
0.1%
0.2%
0.4%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
100.0%
38.8%
56.1%
0.5%
1.3%
1.3%
2.0%
100.0%
40.6%
59.4%
100.0%
0.8%
4.8%
0.2%
6.0%
0.3%
27.3%
11.2%
10.1%
0.3%
7.4%
1.5%
23.7%
0.3%
0.7%
0.0%
0.2%
0.0%
2.8%
2.4%
100.0%
12.5%
15.9%
0.5%
14.0%
1.8%
55.3%
100.0%
14.8%
85.2%
100.0%
3.7%
10.1%
3.9%
9.2%
4.4%
46.2%
1.4%
5.3%
0.1%
4.1%
0.0%
9.5%
0.2%
0.0%
0.1%
0.0%
0.0%
0.0%
1.7%
100.0%
5.5%
15.6%
4.1%
13.4%
4.5%
57.0%
100.0%
14.1%
85.9%
100.0%
0.0%
0.3%
0.0%
0.3%
0.3%
62.7%
0.1%
0.3%
0.0%
0.3%
0.9%
32.7%
0.1%
0.0%
0.0%
0.0%
0.0%
0.3%
1.7%
100.0%
0.1%
0.6%
0.0%
0.5%
1.2%
97.5%
100.0%
1.3%
98.7%
100.0%
1.4%
20.4%
1.1%
7.2%
1.1%
20.1%
1.2%
13.9%
2.0%
2.0%
0.1%
22.3%
0.0%
0.7%
0.0%
0.0%
0.2%
2.8%
3.5%
100.0%
3.1%
35.9%
3.3%
10.8%
1.5%
45.4%
100.0%
7.9%
92.1%
100.0%
0.5%
4.4%
1.4%
14.7%
0.0%
29.4%
0.7%
7.6%
0.5%
12.2%
0.0%
26.6%
0.0%
0.1%
0.0%
0.2%
0.0%
0.2%
1.4%
100.0%
1.2%
12.5%
1.9%
27.9%
0.0%
56.5%
100.0%
3.1%
96.9%
100.0%
6.1%
10.6%
1.1%
5.1%
1.1%
28.5%
7.1%
13.8%
0.4%
3.9%
0.7%
18.2%
0.1%
0.5%
0.0%
0.1%
0.0%
1.1%
1.6%
100.0%
13.4%
25.2%
1.5%
9.4%
1.9%
48.7%
100.0%
16.8%
83.2%
100.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 47
NEW ENG
TESTI NG OF DWELLI NGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units With Basements
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Slabs
Tested For Radon Levels
Tested Units Needing More Work
CONSTRUCTION METHOD
DWELLI NGS W TH RADON REDUCi NG FEATURES
Conventional Constructed On ate
Wth radon reducing features
No radon reducing features
Prefabricated Units (Fanelized)
Wth radon reducing features
No radon reducing features
Modular
Wth radon reducing features
No radon reducing features
ALL Dwellings
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
SIZE OF BUILDER
DWELLI NGS W TH RADON REDUCi NG FEATURES
One to Ten Dwellings Per Year
Wth radon reducing features
No radon reducing features
Eleven To Twenty-Rve Dwellings Per Year
Wth radon reducing features
No radon reducing features
Twenty-Sx To 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
CVer 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
41.2%
5.8%
41.3%
6.2%
17.5%
0.0%
41.4%
0.0%
17.9%
71.9%
0.6%
3.3%
0.0%
6.4%
18.5%
81.5%
100.0%
15.3%
45.5%
0.0%
18.0%
3.2%
4.8%
0.0%
13.3%
Ml D ATL
34.0%
20.3%
37.6%
20.5%
2.8%
0.0%
2.2%
0.0%
41.4%
48.8%
2.8%
0.0%
5.0%
2.0%
49.2%
50.8%
100.0%
14.7%
26.2%
8.4%
5.5%
26.2%
19.1%
0.0%
0.0%
ENCEN
18.8%
20.5%
19.5%
23.9%
27.1%
5.8%
8.8%
0.0%
32.1%
54.8%
2.7%
9.0%
0.0%
1.4%
34.7%
65.3%
100.0%
17.4%
38.7%
10.8%
3.5%
6.5%
17.9%
0.0%
5.3%
W N CEN
20.4%
8.9%
21.1%
9.0%
1.2%
0.0%
10.1%
0.0%
32.2%
49.1%
6.7%
10.3%
1.8%
0.0%
40.6%
59.4%
100.0%
24.5%
39.6%
10.8%
7.7%
5.4%
4.3%
0.0%
7.8%
SAIL
11.8%
6.6%
14.9%
7.1%
7.8%
8.4%
11.0%
6.0%
13.7%
77.4%
1.1%
7.1%
0.0%
0.6%
14.8%
85.2%
100.0%
7.1%
38.0%
2.4%
10.4%
1.7%
16.1%
3.6%
20.7%
E S CEN
3.9%
19.6%
9.7%
18.8%
8.5%
25.4%
0.6%
0.0%
13.5%
75.9%
0.6%
7.0%
0.0%
3.1%
14.1%
85.9%
100.0%
14.1%
44.6%
0.0%
15.3%
0.0%
26.1%
0.0%
0.0%
W S CEN
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
1.3%
86.1%
0.0%
12.6%
0.0%
0.0%
1.3%
98.7%
100.0%
0.3%
22.5%
0.0%
11.9%
1.0%
24.9%
0.0%
39.3%
MTN
6.6%
6.6%
10.0%
8.4%
9.8%
3.6%
2.2%
3.7%
7.0%
86.5%
0.9%
5.6%
0.0%
0.0%
7.9%
92.1%
100.0%
7.3%
21.5%
0.5%
12.1%
0.0%
35.6%
0.0%
23.0%
PAC
1.8%
0.0%
6.0%
0.0%
2.1%
0.0%
0.6%
0.0%
2.8%
91.3%
0.3%
5.5%
0.0%
0.1%
3.1%
96.9%
100.0%
3.1%
33.2%
0.0%
8.4%
0.0%
35.6%
0.0%
19.6%
US TOTAL
11.4%
12.4%
22.2%
14.5%
7.5%
8.3%
3.9%
5.1%
14.8%
74.7%
1.4%
7.6%
0.5%
0.9%
16.8%
83.2%
100.0%
9.0%
32.9%
3.1%
10.0%
3.8%
21.5%
0.9%
18.8%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 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 Wth Sabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALI NG METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings Wth 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%)
SEALI NG METHODS - SLABS
(Multiple Answers Possible)
Dwellings Wth Sabs
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
22.2%
15.2%
2.1%
12.0%
41.6%
93.1%
0.0%
0.0%
0.0%
1.9%
1.9%
0.4%
1.2%
0.0%
3.1%
0.4%
5.0%
100.0%
32.3%
5.6%
23.1%
1.8%
2.5%
9.8%
0.0%
58.2%
133.2%
79.1%
0.0%
6.7%
0.0%
0.0%
7.5%
0.0%
13.4%
106.7%
Ml D ATL
11.3%
36.7%
3.9%
13.3%
24.6%
89.8%
4.8%
0.0%
0.2%
0.8%
5.7%
0.3%
3.9%
0.0%
0.0%
0.3%
4.4%
100.0%
48.3%
11.8%
17.3%
4.0%
0.0%
14.1%
0.2%
38.1%
133.7%
48.3%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
51.7%
100.0%
ENCEN
7.6%
25.6%
4.4%
17.4%
25.2%
80.1%
1.5%
0.1%
0.5%
5.9%
8.0%
0.1%
2.7%
0.4%
2.9%
5.8%
11.9%
100.0%
45.2%
8.7%
16.5%
4.4%
0.9%
30.8%
0.0%
43.6%
150.1%
62.9%
2.3%
20.5%
0.0%
4.6%
26.6%
0.0%
34.8%
151.6%
W N CEN
13.2%
36.5%
2.3%
14.0%
28.8%
94.9%
0.3%
0.3%
0.1%
1.2%
1.8%
0.0%
1.3%
0.0%
1.0%
1.0%
3.3%
100.0%
38.9%
5.1%
21.9%
7.2%
0.2%
27.5%
1.4%
47.1%
149.4%
34.0%
19.2%
7.5%
5.0%
0.0%
13.1%
0.0%
46.4%
125.2%
SAIL
4.1%
12.2%
0.3%
6.2%
5.6%
28.4%
0.5%
0.0%
2.5%
11.6%
14.5%
0.7%
1.8%
0.0%
25.3%
29.3%
57.1%
100.0%
47.1%
8.6%
15.0%
4.0%
0.0%
6.1%
0.0%
42.1%
122.9%
39.3%
1.9%
13.2%
0.4%
0.0%
0.3%
0.0%
48.2%
103.2%
ESCEN
2.0%
4.7%
0.8%
6.4%
7.2%
21.0%
4.1%
0.0%
6.1%
7.3%
17.5%
5.7%
4.5%
0.0%
33.1%
18.3%
61.5%
100.0%
48.3%
3.5%
19.4%
0.0%
0.0%
2.4%
0.0%
51.7%
125.3%
74.0%
0.0%
1.3%
0.2%
0.0%
0.9%
0.0%
26.0%
102.4%
W S CEN
0.0%
0.0%
0.1%
0.4%
0.3%
0.8%
0.0%
0.0%
0.1%
0.4%
0.5%
0.0%
1.2%
0.0%
24.3%
73.2%
98.7%
100.0%
93.2%
46.9%
3.8%
0.0%
44.4%
0.0%
0.0%
5.6%
193.8%
25.6%
0.1%
2.4%
0.0%
0.0%
4.2%
0.0%
74.4%
106.7%
MTN
1.0%
2.2%
0.9%
2.6%
32.3%
39.0%
2.8%
0.5%
1.1%
9.7%
14.1%
0.0%
1.3%
0.1%
10.0%
35.4%
46.9%
100.0%
15.8%
5.6%
14.1%
9.8%
0.2%
1.6%
0.2%
74.6%
121.8%
19.7%
2.0%
9.7%
2.0%
0.0%
0.0%
0.0%
70.8%
104.1%
PAC
0.3%
1.0%
0.2%
7.9%
4.2%
13.7%
0.9%
1.0%
7.3%
20.6%
29.8%
0.0%
0.0%
0.0%
27.0%
29.5%
56.5%
100.0%
53.2%
10.4%
8.3%
1.0%
0.0%
1.0%
1.6%
43.1%
118.6%
55.2%
0.4%
3.3%
0.0%
0.0%
0.0%
0.0%
44.3%
103.2%
US TOTAL
4.6%
12.2%
1.2%
7.3%
13.2%
38.6%
1.3%
0.2%
2.0%
7.4%
10.9%
0.6%
1.8%
0.0%
17.8%
30.3%
50.5%
100.0%
52.8%
15.6%
13.4%
3.4%
9.0%
8.3%
0.3%
39.4%
142.2%
42.7%
2.4%
7.9%
0.7%
0.4%
4.7%
0.0%
51.2%
110.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 49
SUBSLAB PREPARATI ON -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Sabs
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%)
93.1%
0.7%
25.8%
4.5%
47.9%
44.6%
67.9%
0.0%
6.9%
291.4%
82.8%
4.2%
2.7%
6.0%
46.2%
56.7%
73.0%
1.1%
14.3%
287.1%
76.7%
7.3%
19.7%
1.7%
33.9%
49.8%
72.3%
2.9%
13.1%
277.5%
68.0%
2.0%
16.0%
2.4%
23.1%
40.2%
54.5%
5.8%
15.5%
227.4%
40.0%
7.9%
28.0%
1.0%
17.5%
11.9%
87.1%
2.6%
5.9%
202.0%
49.6%
5.1%
11.8%
0.8%
15.4%
14.2%
82.9%
5.2%
2.9%
188.1%
28.7%
2.3%
54.4%
0.1%
4.7%
8.2%
65.4%
1.3%
1.3%
166.4%
71.2%
1.7%
5.1%
2.3%
19.1%
19.8%
48.4%
5.5%
19.9%
193.0%
46.1%
11.9%
45.6%
3.2%
30.5%
6.3%
63.0%
8.8%
13.0%
228.4%
52.6%
5.4%
28.1%
1.8%
21.6%
21.7%
70.9%
3.5%
8.9%
214.6%
SUBSLAB PREPARATI ON -- 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%)
93.2%
0.7%
25.4%
4.7%
46.1%
42.7%
66.0%
0.0%
6.9%
285.7%
82.4%
4.3%
2.8%
6.6%
48.6%
55.2%
71.8%
1.1%
15.0%
287.8%
74.0%
8.5%
18.8%
1.9%
24.7%
44.8%
69.8%
2.9%
15.0%
260.5%
68.6%
2.0%
14.9%
2.3%
21.9%
40.2%
54.4%
5.9%
15.6%
226.0%
73.0%
7.5%
5.4%
0.9%
27.4%
17.9%
92.5%
2.5%
17.9%
244.9%
89.4%
2.4%
6.9%
0.0%
19.6%
25.9%
91.6%
0.0%
10.6%
246.5%
50.1%
2.5%
45.5%
1.3%
3.8%
46.3%
52.6%
0.0%
47.4%
249.5%
72.6%
1.4%
0.0%
10.8%
18.1%
28.5%
28.7%
0.2%
57.7%
217.9%
51.1%
16.1%
23.1%
3.7%
30.1%
13.0%
55.9%
0.5%
51.5%
245.0%
68.5%
5.7%
17.2%
2.9%
23.2%
32.4%
67.4%
1.5%
29.4%
248.2%
SUBSLAB PREPARATI ON -- SLABS
(Multiple Answers Possible)
Dwellings On Sabs
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%)
93.3%
0.0%
26.8%
0.0%
77.6%
77.6%
100.0%
0.0%
6.7%
382.0%
100.0%
0.0%
0.0%
0.0%
31.1%
79.4%
100.0%
0.0%
7.2%
317.8%
85.4%
0.0%
35.4%
0.0%
80.4%
63.0%
79.4%
1.5%
0.9%
346.1%
60.5%
0.0%
46.5%
12.1%
46.3%
33.7%
70.4%
0.0%
7.1%
276.7%
30.7%
6.8%
36.1%
0.2%
20.5%
10.3%
85.4%
1.9%
4.4%
196.3%
37.5%
4.4%
12.1%
0.9%
13.3%
5.3%
84.2%
5.7%
0.4%
163.8%
28.4%
2.2%
54.7%
0.0%
4.5%
8.0%
65.2%
1.3%
1.1%
165.3%
85.7%
0.4%
10.2%
2.0%
10.8%
10.1%
39.2%
5.4%
14.1%
177.9%
38.9%
9.5%
48.5%
4.0%
30.6%
5.7%
64.4%
9.2%
14.3%
225.1%
51.5%
3.5%
34.6%
1.6%
27.3%
23.3%
74.8%
2.7%
5.6%
225.0%
APPENDIX C
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 50
COST OF PASSIVE SUB-SLAB VENTILATI ON
Sample Sze 34 53 79 75 78 20 4 32 13 388
Dwellings
Lessthan$200 31.0% 34.3% 43.0% 28.3% 13.6% 74.7% 89.3% 63.3% 51.9% 34.3%
$200 to $299 18.2% 47.1% 19.8% 17.6% 40.4% 3.6% 10.7% 9.8% 6.6% 28.9%
$300 to $399 13.9% 1.9% 19.9% 28.5% 19.2% 21.7% 0.0% 12.9% 28.1% 16.6%
$400 to $499 29.7% 7.4% 3.6% 6.4% 14.1% 0.0% 0.0% 1.2% 13.1% 8.2%
$500 to $599 1.0% 8.2% 1.5% 4.6% 2.6% 0.0% 0.0% 5.7% 0.0% 3.9%
$600 to $799 2.6% 0.5% 0.3% 4.8% 6.0% 0.0% 0.0% 1.8% 0.0% 2.7%
$800 or greater 3.7% 0.5% 12.0% 9.9% 4.1% 0.0% 0.0% 5.3% 0.3% 5.5%
TOTAL 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0%
COST OF ACTI VE SUB-SLAB VENTI LATI ON
Sample Sze 15 19 37 20 16 4
Dwellings
Lessthan$450 8.3% 42.8% 12.4% 1.9% 19.6% 51.7%
$450 to $549 15.1% 11.9% 32.1% 9.2% 0.3% 0.0%
$550 to $649 3.2% 5.0% 16.5% 17.5% 0.9% 0.0%
$650 to $749 8.3% 34.5% 9.5% 40.5% 9.4% 31.1%
$750 to $849 3.2% 2.0% 19.5% 0.4% 0.2% 13.8%
$850 to $1049 21.8% 2.6% 7.5% 2.8% 1.5% 3.4%
$1050 or greater 40.1% 1.2% 2.5% 27.7% 68.1% 0.0%
TOTAL 100.0% 100.0% 100.0% 100.0% 100.0% 100.0%
0
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
13
27.9%
0.9%
0.0%
10.3%
0.9%
41.2%
18.7%
100.0%
87.2%
0.0%
0.0%
0.0%
10.3%
2.6%
0.0%
100.0%
127
27.2%
15.0%
9.0%
19.0%
8.5%
9.0%
12.4%
100.0%
APPENDIX C
-------
APPENDIX D
SINGLE-FAMILY DETACHED
USAGE COEFFICIENT TABLES
BY THE THREE RADON EXPOSURE ZONES
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE1
SAMPLE SIZE
Units
Builders
WGHTD AVERAGE UNITS PER BLDR
TYPE OF HOUSE: WITH RADON REDUCI NG FEATURES
One Story Dwellings With Basements
Wth radon reducing features
No radon reducing features
One story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
One Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATI ON -- EXCEPT R ERS
Basements
Wth radon reducing features
No radon reducing features
Crawl Spaces
Wth radon reducing features
No radon reducing features
Slabs on Grade
Wth radon reducing features
No radon reducing features
TOTAL
ALL DWELLI NGS -- EXCEPT ON R ERS
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
ZONE1
1961
447
4.4
16.1%
20.9%
2.2%
3.3%
2.0%
5.8%
17.3%
25.1%
1.0%
1.4%
0.7%
2.1%
0. 1 %
0.2%
0.0%
0.0%
0.0%
0.1%
1.9%
100.0%
34.2%
47.0%
3.2%
4.8%
2.7%
8. 1 %
100.0%
40. 1 %
59.9%
100.0%
ZONE2
2482
454
5.5
7.6%
15.5%
1.0%
5.2%
0.9%
26.1%
6.5%
21.4%
0.2%
4.2%
1.4%
6.1%
0.1%
1.9%
0.0%
0.1%
0.0%
0.9%
0.7%
100.0%
14.4%
39.1%
1.2%
9.6%
2.4%
33.3%
100.0%
17.9%
82.1%
100.0%
ZONE 3
2851
377
7.6
0.3%
1.6%
0.1%
4.0%
0.5%
45.6%
0.7%
3.3%
0.0%
3.3%
0.4%
37.4%
0.0%
0.1%
0.0%
0.0%
0.0%
0.9%
1.6%
100.0%
1.0%
5.2%
0. 1 %
7.5%
1.0%
85.3%
100.0%
2.1%
97.9%
100.0%
US TOTAL
7294
1278
6.9
6.1%
10.6%
1.1%
5.1%
1.1%
28.5%
7.1%
13.8%
0.4%
3.9%
0.7%
18.2%
0.1%
0.5%
0.0%
0.1%
0.0%
1.1%
1.6%
100.0%
13.4%
25.2%
1.5%
9.4%
1.9%
48.7%
100.0%
16.8%
83.2%
100.0%
APPENDIX D
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 2
TESTI NG OF DWELLI NGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units With Basements
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Slabs
Tested For Radon Levels
Tested Units Needing More Work
CONSTRUCTION METHOD
DWELLI NGS W TH RADON REDUCi NG FEATURES
Conventional Constructed On ate
Wth radon reducing features
No radon reducing features
Prefabricated Units (Fanelized)
Wth radon reducing features
No radon reducing features
Modular
Wth radon reducing features
No radon reducing features
ALL Dwellings
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
SIZE OF BUILDER
DWELLI NGS W TH RADON REDUCi NG FEATURES
One to Ten Dwellings Per Year
Wth radon reducing features
No radon reducing features
Seven To Twenty-Rve Dwellings Per Year
Wth radon reducing features
No radon reducing features
Twenty-Sx To 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
CVer 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
ZONE1
25.2%
13.7%
27.8%
14.6%
23.0%
7.3%
7.9%
4.1%
35.5%
50.9%
4.5%
7.8%
0. 1 %
1.2%
40. 1 %
59.9%
100.0%
20. 1 %
33.4%
9.4%
5.9%
10.6%
9.7%
0.0%
11.0%
ZONE2
15.0%
14.0%
23.3%
15.3%
6.1%
6.2%
5.1%
8.1%
16.2%
78.5%
0.4%
2.5%
1.3%
1.1%
17.9%
82.1%
100.0%
9.3%
28.5%
3.9%
7.0%
3.2%
38.3%
1.6%
8.2%
ZONE 3
2.6%
0.0%
21.8%
0.0%
1.6%
0.0%
1.3%
0.0%
1.4%
86.4%
0.7%
11.2%
0.0%
0.3%
2.1%
97.9%
100.0%
1.1%
26.6%
0.5%
12.3%
0.5%
24.8%
0.0%
34.2%
US TOTAL
11.4%
12.4%
22.2%
14.5%
7.5%
8.3%
3.9%
5.1%
14.85%
74.71%
1.41%
7.62%
0.51%
0.90%
16.77%
83.23%
100.00%
9.0%
32.9%
3.1%
10.0%
3.8%
21.5%
0.9%
18.8%
APPENDIX D
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 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 Wth Sabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALI NG METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings Wth 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%)
SEALI NG METHODS - SLABS
(Multiple Answers Possible)
Dwellings Wth Sabs
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%)
ZONE1
11.0%
30.5%
3.7%
9.2%
26.9%
81.2%
3.0%
0.2%
0.8%
4.0%
8.0%
0.8%
2.6%
0.1%
2.7%
4.6%
10.8%
100.0%
40.4%
7.5%
21.8%
6.5%
0.1%
24.3%
0.4%
47.3%
148.3%
47.3%
1.9%
5.9%
1.4%
0.5%
3.8%
0.0%
46.8%
107.6%
ZONE2
6.5%
12.8%
1.6%
11.2%
21.4%
53.5%
0.9%
0.3%
1.4%
8.2%
10.8%
0.1%
2.4%
0.0%
14.6%
18.7%
35.7%
100.0%
38.3%
7.2%
12.7%
2.4%
0.7%
13.8%
0.1%
50.1%
125.2%
45.9%
0.2%
6.3%
0.0%
0.1%
1.4%
0.0%
53.5%
107.5%
ZONE 3
0.5%
0.8%
0.2%
2.6%
2.0%
6.2%
0.1%
0.1%
2.6%
4.9%
7.6%
0.3%
0.9%
0.1%
28.6%
56.4%
86.2%
100.0%
45.1%
16.3%
11.9%
2.9%
2.3%
8.6%
1.7%
41.5%
130.2%
31.4%
0.5%
4.8%
0.1%
0.0%
2.8%
0.0%
65.4%
105.1%
US TOTAL
4.6%
12.2%
1.2%
7.3%
13.2%
38.6%
1.3%
0.2%
2.0%
7.4%
10.9%
0.6%
1.8%
0.0%
17.8%
30.3%
50.5%
100.0%
52.8%
15.6%
13.4%
3.4%
9.0%
8.3%
0.3%
39.4%
142.2%
42.7%
2.4%
7.9%
0.7%
0.4%
4.7%
0.0%
51.2%
110.0%
APPENDIX D
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGE 4
SUBSLAB FREPARATI ON -- BASEMENTS & SLABS
(Multiple Answers Fbssible)
Dwellings On Basements And Sabs
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
Rastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
71.1%
4.5%
12.2%
3.5%
39.5%
48.4%
69.5%
0.6%
16.1%
265.3%
62.8%
10.1%
27.0%
1.9%
24.6%
24.1%
70.0%
3.7%
8.9%
233.1%
35.7%
3.6%
46.7%
0.6%
6.8%
5.5%
68.2%
7.9%
3.7%
178.8%
52.6%
5.4%
28.1%
1.8%
21.6%
21.7%
70.9%
3.5%
8.9%
214.6%
SUBSLAB FREPARATI ON -- BASEMENTS
(Multiple Answers Fbssible)
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
Rastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
68.8%
4.3%
11.6%
3.8%
36.8%
46.8%
66.5%
0.7%
18.0%
257.3%
82.3%
6.8%
10.3%
3.1%
35.3%
38.2%
61.5%
3.3%
12.7%
253.6%
65.7%
6.8%
26.7%
2.9%
38.4%
19.2%
83.8%
5.7%
19.7%
268.9%
68.5%
5.7%
17.2%
2.9%
23.2%
32.4%
67.4%
1.5%
29.4%
248.2%
SUBSLAB PREPARATI ON -- SLABS
(Multiple Answers Fbssible)
Dwellings On Sabs
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
Rastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
88.4%
6.6%
16.5%
0.9%
59.9%
60.3%
92.0%
0.0%
1.4%
326.1%
33.8%
14.9%
52.1%
0.0%
8.5%
3.1%
82.6%
4.3%
3.1%
202.3%
33.6%
3.4%
48.1%
0.5%
4.6%
4.5%
67.1%
8.1%
2.6%
172.4%
51.5%
3.5%
34.6%
1.6%
27.3%
23.3%
74.8%
2.7%
5.6%
225.0%
APPENDIX D
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE FAMILY DETACHED HOUSES - 2010 DATA
PAGES
COST OF PASSI VE SUB-SLAB VENTI LATI ON
Sample Sze
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
ZONE1
208
30.2%
26.4%
20.0%
7.5%
4.6%
2.4%
9.0%
100.0%
ZONE2
138
33.1%
20.2%
12.9%
12.5%
2.7%
9.1%
9.6%
100.0%
ZONE 3
53
62.3%
15.6%
15.2%
2.1%
4.1%
0.4%
0.4%
100.0%
US TOTAL
388
34.3%
28.9%
16.6%
8.2%
3.9%
2.7%
5.5%
100.0%
COST OF ACTI VE SUB-SLAB VENTI LATI ON
Sample Sze
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
79
18.3%
14.2%
15.3%
15.5%
5.4%
7.7%
23.6%
100.0%
44
33.9%
4.1%
20.2%
5.3%
8.5%
13.2%
14.9%
100.0%
21
43.7%
19.5%
27.6%
0.0%
5.8%
1.2%
2.3%
100.0%
127
27.2%
15.0%
9.0%
19.0%
8.5%
9.0%
12.4%
100.0%
APPENDIX D
-------
APPENDIX E
MULTI FAMILY
USAGE COEFFICIENT TABLES
BY THE THREE RADON EXPOSURE ZONES
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
MULTIFAMILY DWELLINGS - 2010 DATA
PAGE1
SAMPLE SIZE
Units
Builders
WGHTD AVERAGE UNITS PER BLDR
TYPE OF HOUSE: WITH RADON REDUCI NG FEATURES
One Story Dwellings With Basements
Wth radon reducing features
No radon reducing features
One story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
One Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Two Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Three Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Three Story Dwellings On Slabs
Wth radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATI ON -- EXCEPT R ERS
Basements
Wth radon reducing features
No radon reducing features
Crawl Spaces
Wth radon reducing features
No radon reducing features
Slabs on Grade
Wth radon reducing features
No radon reducing features
TOTAL
ALL DWELLI NGS -- EXCEPT ON R ERS
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
ZONE1
1155
66
17.5
3.3%
14.2%
0.6%
2.9%
1.7%
24.7%
5.6%
9.3%
2.4%
1.9%
3.2%
14.8%
0.9%
4.2%
0.0%
0.0%
0.9%
8.2%
1.0%
100.0%
9.9%
28. 1 %
3. 1 %
4.9%
5.9%
48.2%
100.0%
18.9%
81 . 1 %
100.0%
ZONE2
1246
58
21.5
6.4%
6.7%
0.1%
9.5%
1.3%
20.1%
6.3%
7.9%
0.0%
6.3%
0.6%
20.3%
0.4%
3.7%
0.0%
1.0%
0.3%
5.3%
3.8%
100.0%
13.7%
19.0%
0.1%
17.5%
2.3%
47.5%
100.0%
16.0%
84.0%
100.0%
ZONE 3
1870
42
44.5
0.4%
4.0%
0.0%
0. 1 %
0. 1 %
26.6%
0.2%
5.0%
0.0%
0.9%
0. 1 %
32.6%
0.2%
4.3%
0.0%
0.2%
0.9%
24.3%
0.1%
100.0%
0.9%
13.3%
0.0%
1.2%
1.0%
83.6%
100.0%
1.9%
98.1%
100.0%
US TOTAL
4271
166
28.9
4.2%
8.6%
0.2%
2.6%
1.8%
29.2%
4.7%
7.5%
0.9%
1.6%
1.7%
20.7%
0.7%
3.7%
0.0%
0.2%
1.1%
9.8%
0.8%
100.0%
9.5%
20.0%
1.1%
4.5%
4.6%
60.2%
100.0%
15.3%
84.7%
100.0%
APPENDIX E
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
MULTIFAMILY DWELLINGS - 2010 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 Wth Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Slabs
Tested For Radon Levels
Tested Units Needing More Work
18.1%
6.0%
23.3%
5.0%
23.6%
6.0%
13.6%
7.3%
3.9%
15.8%
9.6%
8.8%
0.1%
0.0%
1.6%
43.7%
1.6%
0.0%
3.1%
0.0%
3.2%
0.0%
1.4%
0.0%
8.9%
6.8%
14.1%
4.5%
8.9%
5.4%
6.6%
9.3%
CONSTRUCTION METHOD
DWELLI NGS W TH RADON REDUCi NG FEATURES
Conventional Constructed On ate
Wth radon reducing features
No radon reducing features
Prefabricated Units (Fanelized)
Wth radon reducing features
No radon reducing features
Modular
Wth radon reducing features
No radon reducing features
ALL Dwellings
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
16.8%
63.8%
1.7%
15.3%
0.3%
2.0%
18.8%
81.2%
100.0%
15.7%
79.9%
0.3%
4.1%
0.0%
0.0%
16.0%
84.0%
100.0%
0.2%
97.3%
1.7%
0.8%
0.0%
0.0%
1.9%
98.1%
100.0%
13.3%
75.0%
1.9%
8.9%
0.1%
0.8%
15.3%
84.7%
100.0%
SIZE OF BUILDER
DWELLI NGS WITH RADON REDUCi NG FEATURES
One to Ten Dwellings Per Year
Wth radon reducing features
No radon reducing features
Eleven To Twenty-Rve Dwellings Per Year
Wth radon reducing features
No radon reducing features
Twenty-Sx To 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
CVer 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
5.3%
9.9%
3.8%
7.6%
9.8%
50.7%
0.0%
13.0%
1.0%
12.3%
2.9%
11.0%
12.2%
39.7%
0.0%
20.9%
0.4%
5.1%
0.0%
8.3%
1.5%
5.1%
0.0%
79.6%
3.0%
14.8%
3.3%
12.9%
9.0%
34.9%
0.0%
22.2%
APPENDIX E
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
MULTIFAMILY DWELLINGS - 2010 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 Wth Sabs
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - SLABS
TOTAL
SEALI NG METHODS - BASEMENTS
(Multiple Answers Possible)
Dwellings Wth 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%)
SEALI NG METHODS - SLABS
(Multiple Answers Possible)
Dwellings Wth Sabs
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%)
ZONE1
10.7%
9.4%
0.6%
10.9%
6.6%
38.0%
2.4%
0.6%
1.3%
3.6%
8.0%
1.0%
5.9%
0.0%
28.3%
18.8%
54.0%
100.0%
34.0%
5.0%
34.4%
7.1%
0.0%
13.4%
0.0%
41.4%
135.2%
47.5%
7.9%
20.2%
7.4%
0.0%
12.4%
0.0%
37.6%
132.9%
ZONE2
3.1%
13.6%
0.1%
2.4%
13.5%
32.7%
0.1%
0.0%
1.5%
16.0%
17.5%
0.9%
2.3%
0.0%
19.4%
27.1%
49.8%
100.0%
19.0%
0.8%
9.4%
0.0%
0.0%
1.0%
0.0%
80.3%
110.4%
40.5%
0.9%
8.9%
0.0%
0.0%
1.4%
0.0%
58.2%
109.8%
ZONE 3
0.0%
0.8%
0.0%
0.9%
12.4%
14.2%
0.0%
0.0%
0.9%
0.3%
1.2%
0.0%
1.0%
0.0%
7.8%
75.8%
84.6%
100.0%
12.5%
0.0%
1.5%
0.0%
0.0%
6.0%
0.0%
87.5%
107.5%
7.8%
0.3%
2.8%
1.0%
0.0%
1.1%
0.0%
89.5%
102.6%
US TOTAL
4.3%
9.3%
0.2%
5.8%
9.9%
29.5%
1.0%
0.2%
0.6%
3.9%
5.6%
1.3%
4.6%
0.0%
23.9%
35.1%
64.8%
100.0%
19.3%
0.9%
17.1%
3.7%
0.0%
8.1%
0.0%
67.7%
116.8%
30.3%
4.6%
13.9%
4.9%
0.0%
6.8%
0.0%
57.7%
118.2%
APPENDIX E
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
MULTIFAMILY DWELLINGS - 2010 DATA
PAGE 4
SUBSLAB FREPARATI ON -- BASEMENTS & SLABS
(Multiple Answers Fbssible)
Dwellings On Basements And Sabs
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
Rastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
70.4%
6.9%
14.5%
5.8%
28.6%
51.5%
76.8%
2.4%
15.1%
271.9%
87.5%
9.9%
32.1%
1.5%
33.7%
12.1%
73.2%
3.0%
18.3%
271.2%
74.4%
0.2%
86.0%
0.3%
10.9%
3.6%
67.8%
4.4%
4.3%
251.8%
73.6%
6.1%
30.8%
2.8%
24.5%
25.6%
72.8%
6.4%
10.7%
253.5%
SUBSLAB FREPARATI ON -- BASEMENTS
(Multiple Answers Fbssible)
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
Rastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
77.9%
0.7%
0.9%
2.1%
16.3%
60.1%
77.2%
0.0%
34.1%
269.3%
97.3%
0.2%
22.4%
0.5%
8.1%
22.2%
65.7%
3.0%
7.1%
226.4%
88.2%
0.0%
84.5%
0.0%
17.6%
11.0%
15.9%
4.5%
17.5%
239.2%
85.7%
0.4%
24.1%
4.4%
18.3%
36.8%
63.5%
2.5%
32.0%
267.7%
SUBSLAB PREPARATI ON -- SLABS
(Multiple Answers Fbssible)
Dwellings On Sabs
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
Rastic sheet (vapor barrier)
Other
None
TOTAL (may exceed 100%)
65.1%
11.2%
24.0%
8.5%
37.3%
45.5%
76.4%
4.0%
1.7%
273.7%
81.1%
16.3%
38.4%
2.2%
50.5%
5.5%
78.1%
3.1%
25.6%
300.7%
72.0%
0.2%
86.2%
0.3%
9.8%
2.4%
76.6%
4.4%
2.0%
253.9%
70.8%
8.6%
34.2%
4.8%
33.1 %
25.9%
74.4%
6.4%
6.3%
264.6%
APPENDIX E
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
MULTIFAMILY DWELLINGS - 2010 DATA
PAGES
COST OF PASSI VE SUB-SLAB VENTI LATI ON
Sample Sze
Dwellings
Less than $200
$200 to $299
$300 to $399
$400 to $499
$500 to $599
$600 to $799
$800 or greater
TOTAL
ZONE1
32
25.3%
37.6%
18.1%
5.3%
3.0%
8.5%
2.3%
100.0%
ZONE2
13
75.0%
13.1%
4.5%
4.5%
0.0%
3.0%
0.0%
100.0%
ZONE 3
7
58.8%
37.7%
3.5%
0.0%
0.0%
0.0%
0.0%
100.0%
US TOTAL
47
49.5%
22.3%
15.5%
6.0%
2.9%
1.9%
2.0%
100.0%
COST OF ACTI VE SUB-SLAB VENTI LATI ON
Sample Sze
Dwellings
Less than $450
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or greater
TOTAL
11
6.6%
0.0%
26.8%
19.2%
2.0%
21.2%
24.2%
100.0%
0.0%
20.7%
10.3%
60.3%
0.0%
0.0%
8.6%
100.0%
0.0%
57.1%
0.0%
0.0%
0.0%
0.0%
42.9%
100.0%
12
33.7%
13.6%
0.8%
18.6%
1.1%
20.2%
12.0%
100.0%
APPENDIX E
-------
APPENDIX F
SINGLE-FAMILY DETACHED
PRODUCT USAGE TABLES
BY THE THREE RADON EXPOSURE ZONES
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE-FAMILY DETACHED PRODUCT USAGE - 2010 DATA
PAGE1
HOUSING STARTS
angle-Family Detached
TOTAL HOUSI NG STARTS (Secluding HUD CDdf
TYPE OF HOUSE: Wl TH RADON REDUCI NG FEATURES
One Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
One story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
One Story Dwellings On Sabs
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Two Story Dwellings On Sabs
Wth radon reducing features
No radon reducing features
Three Story Dwellings With Basements
With radon reducing features
No radon reducing features
Three Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Three Story Dwellings On Sabs
Wth radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATION -- EXCEPT PI ERS
Basements
Wth radon reducing features
No radon reducing features
Crawl Spaces
Wth radon reducing features
No radon reducing features
Sabs on Grade
Wth radon reducing features
No radon reducing features
TOTAL
ALL DWELLI NGS -- EXCEPT PI ERS
Wth radon reducing features
No radon reducing features
TOTAL --ALL DWELLI NGS
ZONE 1
126.9
126.9
20.5
26.5
2.7
4.2
2.5
7.4
21.9
31.9
1.2
1.7
0.8
2.7
0.2
0.2
0.0
0.0
0.0
0.1
2.4
126.9
42.6
58.5
4.0
6.0
3.3
10.1
124.5
49.9
74.6
124.5
ZONE 2
All Data in Thousands
140.9
140.9
10.7
21.9
1.4
7.3
1.3
36.8
9.2
30.1
0.2
6.0
2.0
8.7
0.2
2.7
0.0
0.2
0.1
1.2
1.0
140.9
20.1
54.7
1.6
13.5
3.4
46.6
139.9
25.1
114.8
139.9
ZONE 3
203.5
203.5
0.6
3.3
0.2
8.2
1.0
92.8
1.3
6.7
0.0
6.7
0.9
76.2
0.1
0.2
0.0
0.1
0.0
1.9
3.3
203.5
2.0
10.3
0.3
14.9
1.9
170.9
200.3
4.2
196.1
200.3
US TOTAL
471.3
471.3
31.8
51.7
4.4
19.8
4.8
137.0
32.5
68.7
1.4
14.4
3.7
87.5
0.4
3.1
0.0
0.2
0.1
3.1
6.7
471.3
64.7
123.6
5.8
34.4
8.6
227.6
464.6
79.1
385.5
464.6 .op.
APPENDIX F
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE-FAMILY DETACHED PRODUCT USAGE - 2010 DATA
PAGE 2
All Data in Thousands
TESTING OF DWELLINGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Basements
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Sabs
Tested For Radon Levels
Tested Units Needing More Work
31.4
4.3
34.5
5.0
28.7
2.1
9.9
0.4
20.9
2.9
32.7
5.0
8.5
0.5
7.1
0.6
5.2
0.0
43.6
0.0
3.1
0.0
2.6
0.0
57.5
7.2
110.8
10.0
40.3
2.6
19.6
1.0
CONSTRUCTION METHOD
DWELLINGS WITH RADON REDUCING FEATURES
Conventional Constructed On ate
Wth radon reducing features
No radon reducing features
Prefabricated Units (Panelized)
Wth radon reducing features
No radon reducing features
Modular
Wth radon reducing features
No radon reducing features
ALL Dwellings
Wth radon reducing features
No radon reducing features
TOTAL--ALL DWELLINGS
45.1
64.6
5.7
9.9
0.1
1.5
50.8
76.1
126.9
22.8
110.6
0.6
3.5
1.9
1.5
25.3
115.6
140.9
2.9
175.9
1.4
22.8
0.0
0.6
4.3
199.3
203.5
70.7
351.1
7.7
36.2
1.9
3.6
80.4
391.0
471.3
SIZE OF BUILDER
DWELLINGS WITH RADON REDUCING FEATURES
One to Ten Dwellings Per Year
Wth radon reducing features
No radon reducing features
Seven To Twenty-Rve Dwellings Per Year
Wth radon reducing features
No radon reducing features
Twenty-Sx To 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
CVer 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
25.0
41.6
11.7
7.3
13.2
12.1
0.0
13.6
13.0
39.9
5.4
9.8
4.4
53.6
2.3
11.5
2.1
53.3
1.0
24.6
1.1
49.7
0.0
68.5
40.1
134.8
18.1
41.7
18.7
115.4
2.3
93.6
APPENDIX F
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE-FAMILY DETACHED PRODUCT USAGE - 2010 DATA
PAGES
METHODS EMPLOYED TO REDUCE RADON -- EXCEPT PI ERS
Dwellings Wth Basements
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - BASEMENTS
Dwellings Wth Crawl Spaces
Passive stack subslab ventilation
Fan-driven (active) ventilation
Foundation Wall Vents
None
SUBTOTAL - CRAWL SPACES
Dwellings Wth Sabs
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 Wth 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
13.6
38.0
4.6
11.4
33.5
101.1
3.8
0.2
0.9
5.0
9.9
1.0
3.2
0.1
3.4
5.7
13.4
124.5
40.8
7.6
22.1
6.5
0.1
24.6
0.4
47.8
ZONE 2
All Data in Thousands
9.1
17.9
2.2
15.7
30.0
74.8
1.2
0.4
1.9
11.5
15.1
0.1
3.4
0.0
20.4
26.2
50.0
139.9
28.6
5.4
9.5
1.8
0.5
10.3
0.1
37.5
ZONE 3
1.1
1.7
0.3
5.2
4.0
12.3
0.1
0.1
5.2
9.8
15.2
0.6
1.8
0.1
57.3
113.0
172.7
200.3
5.6
2.0
1.5
0.4
0.3
1.1
0.2
5.1
US TOTAL
23.8
57.6
7.1
32.3
67.4
188.3
5.1
0.7
8.0
26.3
40.2
1.7
8.3
0.2
81.0
144.8
236.1
464.6
75.0
15.0
33.0
8.7
0.9
35.9
0.7
90.4
SEALING METHODS - SLABS
(Multiple Answers Possible)
Dwellings Wth Sabs
Polyethylene or other membrane under slab
Membrane on foundation walls under slab
Caulk around slab, wall openings & joints
Seal interior of foundation walls
6.4
0.3
0.8
0.2
23.0
0.1
3.2
0.0
54.2
0.9
8.3
0.2
101.0
5.6
18.7
1.5
Locate sump access outside of basement
Install air tight sump pit covers
Other
None
0.1
0.5
0.0
6.3
0.1
0.7
0.0
26.8
0.0
4.9
0.0
113.1
1.0
11.1
0.0
120.9
APPENDIX F
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE-FAMILY DETACHED PRODUCT USAGE - 2010 DATA
PAGE 4
SUBSLAB PREPARATION -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Sabs
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
All Data in Thousands
81.4
5.2
14.0
4.0
45.3
55.4
79.6
0.7
18.4
78.4
12.6
33.7
2.3
30.7
30.1
87.4
4.6
11.1
66.1
6.7
86.5
1.1
12.6
10.2
126.3
14.6
6.8
226.0
24.4
134.2
7.5
88.6
95.7
293.2
19.9
36.3
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
69.5
4.3
11.7
3.9
37.2
47.3
67.2
0.7
18.2
61.6
5.1
7.7
2.3
26.4
28.6
46.0
2.5
9.5
8.1
0.8
3.3
0.4
4.7
2.4
10.3
0.7
2.4
139.2
10.3
22.7
6.6
68.4
78.2
123.6
3.9
30.2
SUBSLAB PREPARATION -- SLABS
(Multiple Answers Possible)
Dwellings On Sabs
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
11.9
0.9
2.2
0.1
8.0
8.1
12.4
0.0
0.2
16.9
7.4
26.0
0.0
4.3
1.5
41.3
2.1
1.6
58.0
5.8
83.2
0.8
7.9
7.8
116.0
13.9
4.4
86.8
14.2
111.4
0.9
20.2
17.5
169.6
16.0
6.2
APPENDIX F
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
SINGLE-FAMILY DETACHED PRODUCT USAGE - 2010 DATA
PAGES
All Data in Thousands
OOST 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
13.6
11.8
9.0
3.4
2.1
1.1
4.0
44.9
7.4
4.6
2.9
2.8
0.6
2.0
2.2
22.5
2.2
0.6
0.5
0.1
0.1
0.0
0.0
3.6
23.2
17.0
12.4
6.2
2.8
3.1
6.2
71.0
OOST 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
0.9
0.7
0.8
0.8
0.3
0.4
1.2
4.9
0.9
0.1
0.5
0.1
0.2
0.3
0.4
2.6
0.3
0.1
0.2
0.0
0.0
0.0
0.0
0.6
2.0
0.9
1.4
0.9
0.5
0.7
1.6
8.1
APPENDIX F
-------
APPENDIX G
TOTAL PRODUCT USAGE TABLES
FOR ALL HOUSES
BY THE THREE RADON EXPOSURE ZONES
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
TOTAL PRODUCT USAGE - 2010 DATA
PAGE 1
HOUSING STARTS
angle-Family Detached
Townhouses and Apartments
TOTAL HOUSI NG STARTS (Secluding HUD CDdf
TYPE OF HOUSE: Wl TH RADON REDUCI NG FEATURES
One Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
One story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
One Story Dwellings On Sabs
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Basements
Wth radon reducing features
No radon reducing features
Two Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Two Story Dwellings On Sabs
Wth radon reducing features
No radon reducing features
Three Story Dwellings With Basements
With radon reducing features
No radon reducing features
Three Story Dwellings Wth Crawl Spaces
Wth radon reducing features
No radon reducing features
Three Story Dwellings On Sabs
Wth radon reducing features
No radon reducing features
Houses on piers
TOTAL
TYPE OF FOUNDATI ON -- EXCEPT PI ERS
Basements
Wth radon reducing features
No radon reducing features
Crawl Spaces
Wth radon reducing features
No radon reducing features
Sabs on Grade
Wth radon reducing features
No radon reducing features
TOTAL
ALL DWELLI NGS -- EXCEPT ON PI ERS
Wth radon reducing features
No radon reducing features
TOTAL -- ALL DWELLI NGS
ZONE 1
126.9
29.0
155.9
21.4
30.6
2.9
5.1
3.0
14.5
23.6
34.6
1.9
2.3
1.8
7.0
0.4
1.4
0.0
0.0
0.3
2.4
2.8
155.9
45.4
66.6
4.8
7.4
5.0
23.9
153.1
55.3
97.9
153.1
ZONE 2
All Data in Thousands
140.9
35.5
176.4
13.0
24.3
1.4
10.7
1.8
43.9
11.5
32.9
0.2
8.2
2.2
15.8
0.3
4.0
0.0
0.5
0.2
3.1
2.3
176.4
24.8
61.2
1.6
19.4
4.2
62.8
174.0
30.6
143.5
174.0
ZONE 3
203.5
49.5
253.0
0.8
5.3
0.2
8.3
1.1
106.0
1.4
9.2
0.0
7.1
0.9
92.3
0.2
2.4
0.0
0.2
0.4
13.9
3.3
253.0
2.4
16.9
0.3
15.5
2.4
212.2
249.7
5.1
244.6
249.7
US TOTAL
471.3
113.9
585.3
35.2
60.2
4.6
24.0
5.8
164.4
36.5
76.7
2.1
17.6
4.9
115.1
0.9
7.8
0.0
0.7
0.9
19.4
8.4
585.3
72.6
144.7
6.7
42.3
11.6
298.9
576.9
90.9
486.0
576.9
APPENDIX G
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
TOTAL PRODUCT USAGE - 2010 DATA
PAGE 2
All Data in Thousands
TESTING OF DWELLINGS
All Units
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Basements
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Crawl Spaces
Tested For Radon Levels
Tested Units Needing More Work
Units Wth Sabs
Tested For Radon Levels
Tested Units Needing More Work
36.6
4.6
41.2
5.4
35.4
2.6
13.8
0.7
22.3
3.1
35.9
5.3
8.5
0.7
7.7
0.8
6.0
0.0
45.1
0.0
4.7
0.0
3.3
0.0
64.9
7.8
122.3
10.7
48.6
3.2
24.7
1.5
CONSTRUCTION METHOD
DWELLINGS WITH RADON REDUCING FEATURES
Conventional Constructed On ate
Wth radon reducing features
No radon reducing features
Prefabricated Units (Panelized)
Wth radon reducing features
No radon reducing features
Modular
Wth radon reducing features
No radon reducing features
ALL Dwellings
Wth radon reducing features
No radon reducing features
TOTAL--ALL DWELLINGS
49.9
83.1
6.2
14.4
0.2
2.1
56.3
99.6
155.9
28.4
139.0
0.7
4.9
1.9
1.5
31.0
145.4
176.4
3.0
224.0
2.2
23.2
0.0
0.6
5.2
247.8
253.0
81.3
446.1
9.2
42.5
2.0
4.2
92.5
492.8
585.3
SIZE OF BUILDER
DWELLINGS WITH RADON REDUCING FEATURES
One to Ten Dwellings Per Year
Wth radon reducing features
No radon reducing features
Seven To Twenty-Rve Dwellings Per Year
Wth radon reducing features
No radon reducing features
Twenty-Sx To 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
CVer 100 Dwellings Per Year
Wth radon reducing features
No radon reducing features
26.5
44.5
12.8
9.5
16.0
26.6
0.0
17.4
13.3
44.1
6.4
13.6
8.6
67.2
2.3
18.6
2.3
55.9
1.0
28.7
1.8
52.2
0.0
107.8
42.2
144.4
20.2
51.7
26.4
146.0
2.3
143.8
APPENDIX G
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
TOTAL PRODUCT USAGE - 2010 DATA
PAGES
METHODS EMPLOYED TO REDUCE RADON
Dwellings Wth Basements
Rough-in for subslab ventilation
Passive stack subslab ventilation
Fan-driven subslab depressurization
Only sealed entry routes
None
SUBTOTAL - BASEMENTS
Dwellings Wth Crawl Spaces
Passive stack subslab ventilation
Fan-driven (active) ventilation
Foundation Wall Vents
None
SUBTOTAL - CRAWL SPACES
Dwellings Wth Sabs
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 Wth 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
16.7
40.7
4.8
14.5
35.3
112.0
4.5
0.4
1.3
6.1
12.2
1.3
4.9
0.1
11.5
11.1
28.9
153.1
45.4
8.3
26.3
7.4
0.1
26.5
0.4
53.4
ZONE 2
All Data in Thousands
10.2
22.6
2.2
16.5
34.6
86.0
1.2
0.4
2.4
17.0
21.0
0.4
4.1
0.0
27.0
35.4
67.0
174.0
31.0
5.5
10.6
1.8
0.5
10.5
0.1
47.1
ZONE 3
1.1
2.1
0.3
5.7
10.2
19.3
0.1
0.1
5.6
9.9
15.8
0.6
2.3
0.1
61.2
150.4
214.5
249.7
6.5
2.0
1.6
0.4
0.3
1.5
0.2
11.3
US TOTAL
26.5
67.1
5.8
40.3
72.6
212.3
7.1
1.1
10.1
38.5
56.8
4.2
13.7
0.2
109.4
180.1
307.7
576.9
83.0
15.8
38.5
9.6
0.9
38.5
0.7
111.7
SEALING METHODS - SLABS
(Multiple Answers Possible)
Dwellings Wth Sabs
Polyethylene or other membrane under slab
Membrane on foundation walls under slab
Caulk around slab, wall openings & joints
Seal interior of foundation walls
13.9
1.5
4.0
1.3
30.3
0.3
4.8
0.0
58.4
1.1
9.6
0.6
102.6
2.8
18.3
2.0
Locate sump access outside of basement
Install air tight sump pit covers
Other
None
0.1
2.5
0.0
12.3
0.1
1.0
0.0
37.2
0.0
5.4
0.0
152.3
0.1
0.0
201.9
APPENDIX G
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
TOTAL PRODUCT USAGE - 2010 DATA
PAGE 4
SUBSLAB PREPARATION -- BASEMENTS & SLABS
(Multiple Answers Possible)
Dwellings On Basements And Sabs
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
All Data in Thousands
101.8
7.1
18.1
5.6
53.8
70.2
101.6
1.3
22.8
104.6
15.5
43.4
2.8
40.8
33.9
109.4
5.5
16.5
103.5
6.9
129.9
1.3
18.1
12.1
161.5
17.0
9.0
309.9
29.6
191.3
9.7
112.7
116.2
372.4
23.9
48.3
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
79.5
4.5
12.1
4.2
39.8
54.8
77.0
0.7
22.4
73.3
5.2
10.4
2.4
27.6
31.3
54.0
2.8
10.4
14.4
0.9
9.3
0.4
6.0
3.2
11.6
1.0
3.7
167.2
10.5
31.7
7.0
73.4
89.3
142.6
4.6
36.4
SUBSLAB PREPARATION -- SLABS
(Multiple Answers Possible)
Dwellings On Sabs
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
22.3
2.7
6.0
1.5
14.0
15.4
24.6
0.6
0.5
31.3
10.4
33.0
0.4
13.2
2.5
55.4
2.7
6.1
89.1
6.0
120.6
0.9
12.1
8.9
149.9
16.0
5.3
142.7
19.0
159.6
2.8
39.3
26.8
229.8
19.3
11.9
APPENDIX G
-------
BUILDER PRACTICES REPORT:
Copyright 2011, NAHB Research Center, Inc.
TOTAL PRODUCT USAGE - 2010 DATA
PAGES
All Data in Thousands
OOST 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
14.9
13.8
9.9
3.6
2.2
1.5
4.1
50.0
11.5
5.3
3.1
3.1
0.6
2.2
2.2
28.0
2.8
0.9
0.6
0.1
0.1
0.0
0.0
4.5
29.2
19.9
13.6
6.8
3.0
3.7
6.3
82.5
OOST 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
0.9
0.7
0.8
0.8
0.3
0.4
1.2
5.3
0.9
0.1
0.5
0.2
0.2
0.3
0.4
2.6
0.3
0.1
0.2
0.0
0.0
0.0
0.0
0.6
2.1
0.9
1.5
1.0
0.5
0.8
1.7
8.5
APPENDIX G
-------
APPENDIX H
ANNUAL BUILDER
PRACTICES QUESTIONNAIRE
-------
NAHB
RESEARCH
CENTER
400 Prince George s Blvd
Upper Marlboro, MD 20774
301-249-4000
fax 301-430-6180
www.nahbrc.com
f
n
Builder
Practices
Survey
February 2OI1
£)earf~iome guilder,
We need your input1. For more than 2O years, the N/\l~!£> Research
(Center has relied upon your support forgetting the information needed
to improve America's housing industry, fast participation in our survey
efforts has been vital to our continued progress, [lease complete and
return this Questionnaire as soon as possible.
VVe understand there are many demands on your time and at first glance
this Questionnaire may appear long and complicated, but it uses checkmarks
and percentages to make it easy to describe your typical construction
practices ~ not an exact accounting of building materials.
f lease be assured that all information about your firm will remain confidential.
If you have any Questions or would like an additional copy of this questionnaire
fora fellow builder, please contact Joanne A/fc/Vp'" at (SOo) 6^8-8556,
ext. 6506, or send an e-mail to imcalpin@nahbrc.com.
~fhankyou in advance for your assistance.
Sincerely,
l l_uzier
president
NAH5 Research Center
Respondents who complete and
return the survey will receive their
choice of one of the following gifts.
(Please check ONE)
O Apparel Grab Bag (S)
O Apparel Grab Bag (M)
O Apparel Grab Bag (L)
O Apparel Grab Bag (XL)
O Apparel Grab Bag (XXL)
O Apparel Grab Bag (XXXL)
O 100' Measuring Tape
O 8GB USB Flash Drive
O Laser Level
-------
Did you build any new homes in 2010?
Your firm is eligible to participate if it completed any single-family homes or multifamily units in 2010.
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 2010. 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 2010. 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 2010?
Country: USA State: j County / Parish: 2 Email:
GENERAL CHARACTERISTICS
Number of houses (or living units)
Average square feet (sf) above-grade ...
SFD
STARTER
3
_sf 4
SFD
MOVE-UP
SFD
LUXURY
SFA MF
TOWNHOUSE/DUPLEX MULTIFAMILY
49
Sf 50
-Sf 5
6
sf
sf 51
7
72
73
Sf 74
Finished sf typical basement
Average selling (listed) price $
Typical lot size (sf or acres)
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
58
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 1 !/2 (include split levels)
Two or 2!/2
Threeor3!/2
Four or more stories **
15
16
17
38
39
40
SFD SFA MF
LUXURY TOWNHOUSE/DUPLEX MULTIFAMILY
# HOUSES * # UNITS * # BUILDINGS *
61
62
63
84
lOla
102
103
104
-------
GARAGES AND CARPORTS
SFD
STARTER
# HOUSES •»•
1 Car Garage i «
2 Car Garaee i o
3 or more Car Garage 90
1 Car Carport 9^,
2 or more Car Carport m.
No Garaee or Carport 91
NUMBER OF ROOMS
SFD
STARTER
# ROOMS
PER HOUSE »
Bedroomfsl 99
Half Bathroom(s) 9^
Full or 3/4 Bathroom(s) n
Total Rooms (Exclude Bathrooms') 9/1
Closets (Include Coat / Linen / Pantrvl 9^
SFD SFD SFA MF
MOVE-UP LUXURY TOWNHOUSE/DUPLEX MULTIFAMILY
# HOUSES •»• # HOUSES » # UNITS •»• # UNITS »
A-l KA Tfifi 77^!
49 fiS 7fi7 T7d
43 fifi 7fi7a 77/la
«a fifia TfS. 77S
/l^h fifth 7fiO 77fi
44 fi7 7fiQa 77fiq
SFD SFD SFA MF
MOVE-UP LUXURY TOWNHOUSE/DUPLEX MULTIFAMILY
# ROOMS # ROOMS # ROOMS # ROOMS
PER HOUSE * PER HOUSE * PER UNIT * PER UNIT *
A^ fiS 88 IfK
4fia fiQa 8Qa 1 Ofia
4fi fiQ SQ lOfi
in 7n on im
AX 71 01 ins
SUBSLAB PREPARATION
What did you place under your concrete slab floors for your
living areas?
SLAB- BASEMENT
ou use) ON-GRADE SLAB
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.
4" or greater layer of stone or gravel [ ] 121j [ ] 121_2
Less than 4" layer of stone or gravel [ ] 122,1 [ ] 122,2
Sand [ ] I22c_l [ ] 122c_2
Strips or layers of geotextile drainage mat [ ] i23_i [ ] i23_2
Rigid foam insulation [ ] 124j [ ] 124_2
Perforated plastic pipe [ ] i25_i [ ] i25_2
Plastic sheet (vapor barrier, 6 mil poly) [ ] i25c_i [ ] i25c_2
Other [ ]i26i [ ]i262
(PLEASE SPECIFY)
SFD SFA MF
HOUSES UNITS BUILDINGS
Poured concrete, reusable forms 109
Concrete block (CMU) !! 0
Precast concrete
(e.g., Superior Walls®) m
. 109b
. HOa
. HOb
Nothing under slab
127_1
127_
Insulated Concrete Forms (ICFs) \\2
Pressure treated wood 113
Other
(PLEASE SPECIFY)
114
100% 100%
100%
. lllb
-------
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%
. 129
100%
CONCRETE & MASONRY ABOVE-GRADE WALLS
If any of your homes had concrete or masonry above-grade walls,
what percent were each of the following types?
Do not include basement walls or brick veneer finish.
Poured concrete, reusable/temporary forms i46
Concrete block (CMU)
Precast concrete (e.g., Superior Walls®)
Insulated Concrete Forms (ICFs)
Autoclaved aerated concrete (AAC)
Structural brick (brick wall supports roof)
Other concrete or masonry
. 147
. 149
. 150
(PLEASE SPECIFY)
100%
. 135
. 138
TYPES OF EXTERIOR WOOD & STEEL WALLS
What percent of your homes with wood and steel walls used the
following types of construction?
Site-built light-frame (2x4s, 2x6s, etc.) _ i34
Panelized light-frame (factory -built wall panels)
Modular (factory -built structure)
Structural Insulated Panels (SIPs)
Post and beam or "timber frame"
Logs _ 139
100%
TYPE OF WOOD WALL STUDS
What is the most common type or species of wood for your wall
studs?
Timberstrand® or laminated strand lumber (LSL)
Southern yellow pine (SYP)
Douglas fir
Hem-fir or other western woods
Spruce / Pine / Fir (SPF) or eastern spruce
LVL (laminated veneer lumber)
Don't know
Other
(PLEASE SPECIFY)
What percent of your wood wall studs were?
Preservative treated
Finger jointed (any species)
9
]10
. n!45a
. n!45b
WALL HEIGHT
What percent of your interior walls had the following heights?
Exclude two-story foyers & great rooms from your estimates.
FIRST STORY UPPER STORIES
7' or less
T/2'
8'
8!/2'
9'
10'
12' or more
100%
. 501
. 502
. 503
. 504
. 505
. 506
. 507
100%
. 509
. 510
. 511
. 512
. 513
. 514
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
(PLEASE SPECIFY)
140
141
142
143
144
140a
141 a
142a
143a
144a
100%
100%
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
100%
. 522
. 521 a
. 515
. 516
. 517
. 518
. 519
. 520
. 520a
INTERIOR WALL & CEILING FINISH
What percent of your typical home's total wall and ceiling area
had the following interior finishes?
1/4" plywood paneling
1/4" hardboard paneling
3/8" gypsum drywall (all types)
1/2" gypsum drywall (all types)
Cement board (glass-reinforced)
Fiber cement (Hardibacker®, etc)
5/8" gypsum drywall (all types)
3/4" gypsum drywall (all types)
Lumber boards or shingles
Acoustical ceiling tiles
Other
(PLEASE SPECIFY)
WALLS CEILINGS
523 532
524
525
526
527
530a
528
529
530
533
534
535
536
539a
537
538
539
540
531
541
100%
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
Headers Headers
Built-up dimensional lumber
Solid wood (4xs, etc.)
Glulam
Wooden I-joists used singly
Wooden I-joists doubled
LVL single
LVL doubled
Parallam®
Concrete
Steel (all types)
Glued & nailed box headers
Wood truss
Timberstrand®(LSL)
Flitch plate beams (lumber
with steel plate, bolted) 166 ieea iso
^replace / Door Door
leaders Headers Headers
153 153a 167
154
155
156
157
158
159
160
161
162
163
164
165
154a
155a
156a
157a
158a
159a
160a
161 a
162a
163a
164a
165a
168
169
170
171
172
173
174
175
176
177
178
179
100%
100%
100%
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.) i82
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 (including Homosote & Built-Rite®) 191
Cement board (glass mesh reinforced, Durock®). j 92
Fiber cement (Hardipanel®, etc.) i92a
Gypsumboard (including Dens-Glass®, FibeRock®) 193
1/8" foil-faced 3-ply kraft paper (Thermo-ply®) i94
Lumber board sheathing ! 95
Extruded polystyrene - XPS (blue
Dow Styrofoam®, pink Owens Corning) 196
Expanded polystyrene - EPS, or "bead board" i97
Polyisocyanurate (Tuff-R®, Thermax®, R-Max®)
Other
(PLEASE SPECIFY)
100%
. 198
. 199
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:
! [ ] XPS 2 [ ] EPS 3 [ ] 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
one)
What percentage of your homes are fully sheathed with either
plywood or OSB? 2025
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 212 216
Precast concrete 2is 217
Wood or lumber 2i4 218
Steel (all types) 2is 219
100%
100%
DEPTH OF STRUCTURAL FLOOR
For each material you used, ^the most common depth of your
floor framing:
LUMBER WOODEN OPEN-WEB STEEL
JOISTS I-JOISTS JOISTS JOISTS
10" (or 9-7/8")
12" (or 11-7/8") L j L j L j L J3
14" or greater L j L j L j L J4
1033
1034
1035a
TYPES OF WOOD FLOOR FRAMING
What percent of your structural wood floors on ground and upper
floors were:
Do not include support beam, GROUND UPPER
slabs, or concrete. FLOOR FLOORS
Lumber joists, solid wood 220 225
Wooden I-joists 221 226
Open-web joists (wood floor truss) 222 227
Structural Insulated Panels (SIPs) 223 228
Other wood 224 229
(PLEASE SPECIFY)
100%
100%
-------
SPACING OF FLOOR FRAMING
What percent of your framed floor area had joists spaced at:
LUMBER WOODEN OPEN-WEB STEEL
JOISTS I-JOISTS JOISTS JOISTS
12" O.C. 1036 1042 1048 1 048a
16" o.c.
19.2" o.c.
24" o.c.
32" o.c.
Other spacing
1037
1038
1039
1040
1041
1043
1044
1045
1046
1047
1049
1050
1051
1052
1053
1049a
1 050a
1051a
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)
Douglas fir or hem-fir
Spruce / Pine / Fir (SPF), or eastern spruce
Treated lumber
Don't know
Other
(PLEASE SPECIFY)
FLOOR SHEATHING (SUBFLOORING)
What percent of your total floor area used each of the following
sheathing (sub-flooring) materials?
GROUND
FLOOR
UPPER
FLOORS
Concrete or SIPs
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
(PLEASE SPECIFY)
.231
. 232
. 233
. 234
. 235
. 236
. 237
. 238
. 239
. 240
. 241
. 243
. 244
. 245
100%
100%
If you used OSB floor sheathing, what
was the typical brand or type?
Generic or commodity
Advantech (Huber)
EdgeGold (Weyerhaeuser)
Pinnacle (Norboard)
Point Six (Durastrand)
TopNotch (LP)
Other
(PLEASE SPECIFY)
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) _ j j ]
TimberS trand ® _ 1 1 1
OSB (G-P Fiberstrong®, L-P Solid Start®, etc.)
Wooden I-j oists with blocking
Plywood
Dimensional lumber (2xlO's, etc.)
LVL (laminated veneer lumber)
Re-sawn glulam
.1117b
. 1117c
100%
. 1117d
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, whichprovide
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
Single-family detached (SFD)
floor beams: LF perHOUSE L
Single-family attached (SFA)
floor beams: LF perUNIT L
Multifamily
floor beams: LF perUNIT L
FLOOR BEAM MATERIAL
What percent of your floor beams were:
UPPER
FLOORS
LF1
1064
GROUND
FLOOR
UPPER
FLOORS
Built-up dimension lumber
Solid lumber (4x6 or greater)
Glulam
LVL
Parallam®
TimberStrand®
Open-web Joist
Steel (all types)
I-Joist (multiple)
Other
(PLEASE SPECIFY)
. 1099
. 1101
. 1102
. 1109
. 1111
. 1114
. 1106
. 1116
100%
100%
-------
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 logo
. LF 1080
. LF
What percent of your roof and ceiling assembly beams were:
Built-up dimensional lumber 10si
Solid lumber (4x6 or greater) 1082
Glulam
LVL _
Parallam®
TimberStrand®
Girder truss
Steel (all types)
I-Joist (multiple)
. 1083
. 1084
. 1085
. 1085a
. 1086
. 1087
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
Flat _
Other
(PLEASE SPECIFY)
. 263
. 264a
. 264
100%
TURNED GABLES AND DORMERS
How many turned gables (gables perpendicular to the
main ridge of the roof) and dormers did your
typical house or multifamily building have? MF
SFD SFA BUILDINGS
Turned gables
Dormers
265
266
. 266a
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
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't know
Other
(PLEASE SPECIFY)
280
281
282
282a
283
284
285
286
287
287 i
288
289
100%
100%
(PLEASE SPECIFY)
100%
COMBINATION TRUSS & RAFTER ROOFS
For roofs framed with both trusses and rafters, what percent of
the roof was typically framed with each?
Trusses 274
Rafters 275
100%
RAFTER ROOFS
If you built with rafters, what percent of your rafters were:
Lumber 276
I-jOiStS 277
Steel 278
100%
TRUSS ROOFS
If you built with roof trusses, what percent of your trusses were:
Lumber
I-joists
Steel
100%
CEILING TYPE
What percent of the ceiling area directly under the roof was:
Sloped (i.e., cathedral or vaulted) 296
Flat 297
100%
OVERHANG / EAVES
How deep was the eave or overhang of your typical house?
Inches 267
ROOF PITCH
What percent of your roofs had pitches of:
Flatto!/2 712" _
!/2 712" to 4/12" _
5/12" or 6/12" _
7/12" or 8/12"
9/12" or 10/12" _
11/12" or greater
100%
. 290
.291
. 292
. 293
. 294
. 295
-------
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)
Cedar shakes (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) _ 32i
Single ply (EPDM, vinyl, modified bitumen) _ 322
Composite shingles (plastic or recycled rubber) _ 322b
Other 322a
3n
. 313
. 316
. 318
. 320
. 314
(PLEASE SPECIFY)
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't know
Other
31 lv
313v
322bv
(PLEASE SPECIFY)
100%
ROOF VENTILATION
What percent of your homes and multifamily buildings had:
MF
SFD SFA 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
336
329a
330a
331a
332a
333a
334a
335a
336a
329b
330b
331b
332b
333b
334b
335b
336b
ROOF SHEATHING
What percent of your total roof area was sheathed with:
NONE (roofing attached directly to framing, or SIPs) 298
3/8" plywood 299
1/2" plywood 30o
5/8" plywood 3M
3/4" plywood 302
ZIP Roof System® (Huber) 302a
7/16" OSB (including TechShield®) 303
1/2" OSB (including TechShield®) 303a
5/8" OSB (including TechShield®) 304
3/4" OSB (including TechShield®) 305
l"x boards (3/4" actual) - no spacing 306
l"x boards (3/4" actual) - spaced 30v
2"x lumber (1-1/2" actual - including T&G) 30g
Other
(PLEASE SPECIFY)
309
100%
SOFFIT & FASCIA MATERIAL - EAVES & RAKES
What percent of your soffit and fascia material was made of:
SOFFIT FASCIA
NO soffit or fascia installed
Cedar boards
Redwood boards
Other wood boards
Plywood / LVL
. 358
. 359a
. 359b
. 359c
. 360a
.366
. 367a
. 367b
. 367c
Totals need not add to 100%
Hardboard or MDF (e.g., MiraTEC®,
PrimeTrim®, engineered wood trim)
OSB (LP SmartSide®)
Stucco
Cellular PVC (Azek®orKoma®)
Vinyl (wrap for fascia)
Aluminum (wrap for fascia)
Steel
Fiber cement
Urethane / Polyurethane plastic
Plastic & wood fiber composite
Other
(PLEASE SPECIFY)
361
362
363
365e
364
365
365b
365c
365d
365f
365a
369
370
371
373e
372
373
373b
373c
373d
373f
373a
100%
100%
-------
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-l 11) 341
OSB (e.g., LP SmartSide®) 345
Hardboard 342
Cedar shingles (sawn) or shakes (split)
Cedar boards
Redwood boards
Other wood boards
Other wood-based siding
. 344
. 343b
. 343c
346
(PLEASE SPECIFY)
Masonry and Cement Materials
Brick 347
Natural stone 348
Manufactured stone ("synthetic stone") 349
Cement stucco 350
Synthetic stucco or EIFS (e.g., Dryvit®, STO®) 351
Architectural concrete block (split-face, etc.) 352
Fiber cement siding
(e.g., Hardiplank®, CertainTeed) 353
Plastic & Metal Siding
Vinyl 354
Aluminum 355
Steel
Other
. 356
(PLEASE SPECIFY)
100%
719
EXTERIOR TRIM MATERIAL
What percent of the total exterior ornamental trim you installed
was made of (exclude soffit & fascia):
NO exterior ornamental trim installed
Cedar boards
Redwood boards
Other wood boards
Plywood / LVL 721
Hardboard or MDF (e.g., MiraTEC®,
PrimeTrim®' engineered wood trim) 722
OSB (LP SmartSide®) 723
StUCCO 723a
Vinyl (wrap) 723b
Aluminum (wrap) 723c
Steel 725
Fiber cement 725a
Urethane / Polyurethane plastic 725b
Cellular PVC (Azek® or Koma®)
Plastic & wood fiber composite
Other
EXTERIOR TRIM TYPE
Considering your typical house, what style of exterior trim /
molding do you most commonly apply? OTHER
FRONT FRONT DOORS OR
EAVES DOOR WINDOWS WINDOWS
Board only, no crown [ ] [ ] [ ] [ ] j
Board and crown [ ] [ ] [ ] [ ] 2
Crownonly [ ] [ ] [ ] [ ]3
Dentil molding [ ] [ ] [ ] [ ]4
Pediments [ ] [ ] [ ] [ ]5
Pilasters [ ] [ ] [ ] [ ]6
Arches [ ] [ ] [ ] [ ]7
Other special moldings [ ] [ ] [ ] [ ] 8
None (pattofdoor/window) [ ] [ ] [ ] [ ]9
N76 N77 N78 N79
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
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
.378 .
. 379
GLAZING
What percent of your windows were:
Single glazed
Double glazed
Triple glazed
Heat-Mirror®
100%
. 422
. 423
. 424
. 425
(PLEASE SPECIFY)
100%
GLASS TYPE
What type of glass did your windows most commonly have?
Clear
Low-E
Argon filled
Tinted
Impact resistant
426
427
427a
428
428a
Totals need not add to 100%
-------
MATERIAL OF WINDOW FRAMES
What percent of all the window units you installed had the
following frame material? MF
SFD SFA UNITS
Wood (no cladding) 380 387 394
Wood, aluminum clad 38i 388 395
Wood, vinyl clad 3S2 339 395
Aluminum 383 390 597
Vinyl 384 391 398
Composite 38s 392 399
Other 38fi 393 400
(PLEASE SPECIFY)
100%
100%
100%
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
401
402
403
404
405
406
407
407a
408
409
410
411
412
413
414
41 4a
415
416
417
418
419
420
421
421 1
(PLEASE SPECIFY)
100%
100%
100%
SKYLIGHTS AND ROOF WINDOWS
How many skylights/roof windows did your typical house have?
MF
SFD SFA Per BUILDING
Skylights 323 325
Tubular Skylights 323a 325a
Roof windows 324 326
EXTERIOR SHUTTERS
How many PAIRS of exterior shutters did
your typical house have? SFD SFA
731 731a
What percent of the shutters were made of:
Wood (any type) 732 732a
Plastic (including
polyurethane and PVC) 733 733a
Other 734 734,
327
327i
328
MF
Per UNIT
731b
732h
733b
734b
100%
100%
100%
What percent of the shutters were of the following styles?
Raised panel 735 735a 735b
Lowered 736 736a 736b
Board and Batten _
Other
. 737
. 738
. 738a
737b
738b
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
. 429b
. 429c
. 430
. 431
PATIO DOOR TYPE
What percent of all your patio doors were:
SFD SFA
Hinged/Swinging 432
Sliding
433 _
100% 100%
MF
434 436
437
. 435
100%
PATIO DOOR MATERIAL
What percent of all your patio doors were:
HINGED SLIDING
Steel
Alumi
Vinyl
Compi
Other
aluminum clad
vinyl clad
lum
isite (fiberglass, etc.)
439
440
441
442
443
444
445
447
448
449
450
451
452
453
(PLEASE SPECIFY)
100%
100%
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 458 463
Steel - raised panel 459 464
Steel-flush 460 4es
Fiberglass 4ei 466
Other
(PLEASE SPECIFY)
461a 4
100% 100%
DOUBLE FRONT DOORS
What percent of your front doors were double doors? 467
100%
100%
100%
-------
SIDELITES
What percent of your front doors had sidelites?
Sidelites on one side
Sidelites on both sides
NO sidelites
100%
. 468
.469
. 470
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
INTERIOR DOORS
Interior doors include bedroom, bathroom, closet, and all other
interior doors. What percent of your interior doors were:
Single interior hinged door(s)
Double interior hinged door(s)
Single bi-fold door(s)
Double bi-fold door(s)
Sliding / Pocket / Bypass door(s)
Other door(s)
. 477a
. 47 7b
. 477c
(PLEASE SPECIFY)
100%
. 477f
. 478
. 479
. 479a
. 480
488a
489
INTERIOR DOOR MATERIAL
What percent of all your interior doors were:
PASSAGE CLOSET
SOLID WOOD DOORS
Panel door
Flush door
Louvered door
Door with glass units
ENGINEERED WOOD DOORS
Hollow core panel door 480a 489a
Hollow core flush door 481 490
Solid core panel door 482 49i
Solid core flush door 482a 49ia
OTHER TYPES OF DOORS
Mirror on steel frame
Steel (no mirror)
Other
. 483
.484
(PLEASE SPECIFY)
.486
. 492
.493
.495
100%
100%
CABINETS & COUNTERTOPS
Indicate the number of cabinets and the linear feet of kitchen
countertop you installed in a typical home.
Number of Kitchen cabinets
Number of Vanity cabinets
Number of Medicine cabinets
Number of Other cabinets
Linear feet of Kitchen countertops
SFD & SEA
542
543
543a
544
545
ME
. 558
. 559
. 559a
. 560
. 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®) 585 591
Ceramic tile
Cultured marble
Engineered stone or quartz
surfacing (Zodiaq®, Silestone®) 587a 593a
Solid wood (butcher block)
Granite
Marble, slate, or other natural stone
Other
. 587
592
593
(PLEASE SPECIFY)
594
594a
595a
595b
100%
100%
MATERIAL OF CABINET BOX
What per cent of the cabinets you installed had sides and shelves
made of: SFD & SEA ME
Wood veneer on particleboatd or MDF
Solid Wood _
Plastic or paper overlay, or laminate
on particleboard or MDF 577 581
Plywood (all types) 51S 582
Other 579 583
. 576
. 57 6a
580
580a
(PLEASE SPECIFY)
100%
100%
CABINET DOOR TYPE
What percent of the cabinets you installed had the following types
of doors?
SFD & SEA MF
Wood finish, raised panel in frame
Wood finish, flat panel in frame
Glass panel in wood frame
Laminate with raised panel look
Wood finish, flat panel, no frame
Laminate finish, flat panel, no frame
Other
563
564
564a
567
565
566
568
572
571
571a
574
570
573
575
(PLEASE SPECIFY)
100%
100%
CABINET FRAME TYPE
What percent of the cabinets you installed had the following types
of face frames? SFD & SFA ME
Frameless (European style)
Face-framed (Traditional)
Other:
(PLEASE SPECIFY)
. 562a
. 562b
. 562c
100%
100%
10
-------
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
What percent of your driveways were made of:
Asphalt
Poured concrete (including stamped/stenciled)
Brick
Concrete paver
Gravel or crushed stone w/ parking pad
Gravel or crushed stone w/ no parking pad
Other
(PLEASE SPECIFY)
100%
GARAGE DOOR CONFIGURATIONS
What percent of your garages had the following types of doors?
One single door
One double door
Two single doors
One double door, one single door
Three single doors
Other configuration
(PLEASE SPECIFY)
100%
. 750a
. 750
. 751
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 754
WOOd 755
Fiberglass or Plastic 756
Other 757
100%
What percent of your garage doors were the following styles?
Raised panel 759
Flat panel 76o
Other 761
. 759a
. 760a
100%
What percent of your garage doors were the following heights?
7 foot
8 foot
Other 761 a
100%
What percent of your garage doors were insulated? S2\ a
What percent of your garage doors had windows? 824a
What percent of your garage doors had openers? 745
FINISHED FLOORING TYPE
What type of flooring do you most commonly install in the following rooms?
Wall-
to-Wall Hardwood Hardwood Vinyl
(Sonly one box per row) Carpet (solid) (engineered) Sheet
1234
Entry foyer (^bne) D D D D
Living room (^one D D D D
Dining room (Sone) D D D D
Family room, den, rec room (Sone) D D D D
Kitchen (^one) D D D D
Bedrooms (^one) D D D D
Half bathrooms (Sone) D D D D
Full bathrooms (Sone) D D D D
Hallway (^bne) D D D D
Finished basement (^bne) D D D D
Vinyl
Tile
5
D
D
D
D
D
D
D
D
D
D
Laminate
6
D
D
D
D
D
D
D
D
D
D
Ceramic
Tile
D
D
D
D
D
D
D
D
D
D
Slate
8
D
D
D
D
D
D
D
D
D
D
Marble Other
9 10
D D 64,
D
D
D
D
D
D
D
D
643
1 — 1
D
651a
11
-------
ROOMS WITH FLOORING UNDERLAYMENT
In which rooms did you typically use underlayment?
(Sail that apply)
None [ ]661a
All Rooms [ ] eeib
Entry foyer [ ] 652
Living room [ ] 653
Dining room [ ] 655
Family room, den, rec room [ ] 656
Kitchen [ ] 657
Bedrooms [ ] 658
Half bathrooms [ ] 659
Full bathrooms [ ] 6ei
Hallway [ ] 661c
Other rooms [ ] 662
(PLEASE SPECIFY)
FLOORING UNDERLAYMENT MATERIAL
Underlayment is a second layer of sheet goods over the
structural floor sheathing or concrete slab.
What percent of all the flooring underlayment you used was:
Lauan plywood
1/4" OSB
3/8" OSB
7/16" or 1/2" OSB
5/8" OSB
3/4" OSB
1/4" plywood (other than lauan)
3/8" plywood
1/2" plywood
5/8" plywood
3/4" plywood
1/4" particleboard
3/8" particleboard
1/2" particleboard
5/8" particleboard
3/4" particleboard
1/4" hardboard
Fiber cement (e.g., Hardibacker®, etc)
Cement board (Durock®1 Wonderboard®, etc)
Gypsum panel (FibeRock® or Dens-Shield®)
Poured lightweight concrete (Gypcrete®, etc.)
Other
668
670
671
673
675
679
685a
686
(PLEASE SPECIFY)
687
100%
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
NOT insulated
Fiberglass batt and blown
Fiberglass batt
Fiberglass blown
Rockwool batt
Rockwool blown
Cellulose blown
Spray foam
Foam board
Other
CEILINGS
INSULATED R-VALUE
820
812
813
814
815
816
817
818
822
819
81 2r
813r
814r
815r
81 6r
817r
818r
822r
81 9r
(PLEASE SPECIFY)
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 ^per column:
BENEATH SLAB PERIMETER
Extruded polystyrene
(e.g., Dow-Styrofoam®, etc.)
Expanded polystyrene (bead board)
Polyisocyanurate (e.g., Thermax®)
Fiberglass
No insulation used for slab
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 ^per column:
BENEATH SLAB PERIMETER
3/4" [ ] [ h
]2
1-1/2"
2" or more
[ ]
[ ]
845
[ ]:
[ L
846
BASEMENT AND CRAWL SPACE INSULATION
What method did you typically use to insulate the foundations of
homes with basements or crawl spaces? (One ^per column)
BASE- CRAWL
MENTS SPACES
[ ] Mi
Between floor joists of the ground floor
Entire interior and exterior surfaces
of the foundation wall
Entire interior surface of foundation wall
Only above-grade interior
Entire exterior surface of foundation wall
Only below-grade portion of foundation
wall exterior
Only above-grade portion of foundation
wall exterior
Foundation wall cavity
NO foundation insulation used
[ ] M:
]3
]4
[ ]
847
848
12
-------
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 ^two materials; otherwise ^only one.
Fiberglass batt or blanket
Rockwool batt
Fiberglass / rockwool board
Extruded polystyrene (XPS)
Expanded polystyrene (EPS)
Polyisocyanurate
Spray foam
Other
FEE
[
[
[
[
[
[
[
r
JAI
851
851
851
851
851
851
851
851
R-VALUE
1 851
2
3
4
5
6
8
7
851
851
851
851
851
851
851
Jr
7r
_3r
_4r
_5r
6r
_8r
7r
(PLEASE SPECIFY)
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
Rockwool batt
Fiberglass blown
Cellulose blown
Spray foam
Foam board or SIPs
If you used spray foam insulation anywhere in your homes,
was it typically Polyurethane?
Yes [ h
No [ ]2
Don't know [ ] 3
945
CATHEDRAL CEILING INSULATION MATERIAL
What percent of your cathedral / sloped ceilings were insulated
with the following materials, and what was the typical R-value?
NOT insulated
Fiberglass batt or blanket
Rockwool batt or blanket
Spray foam
Foam board or SIPs
Other
% CATHEDRAL
CEILINGS
INSULATED R-VALUE
831
(PLEASE SPECIFY)
100%
. 842r
. 829r
. 830r
SOUND INSULATION
What percent of your homes had some insulation in their
interior partition walls and / or floors-between-stories to
dampen sound? ME
SFD SEA BUILDINGS
Homes with wall sound insulation
806 807 808
Homes with floor sound insulation
GARAGE INSULATION
What percent of your garages had insulation installed in the:
Ceilings 853
All walls 854
Only walls shared with living space 855
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
Rockwool batt
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
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
Other roof/ceiling/attic radiant barrier
Radiant barrier in wall
857
857a
858
Totals need not add to 100%
13
-------
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 i008
Attic only 1009
Both attic and basement or crawlspace 1010
In or under concrete floor slab ion
Both in attic and concrete floor slab iona
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) 9i4
Other 914a
100%
(PLEASE SPECIFY)
RUN-OUT DUCTS
Metal 915
Flexible 9i6
Fiberglass, rigid (foil-faced fiberglass board) 917
Other 917a
100%
(PLEASE SPECIFY)
WALL STACKS
Metal 9i8
Fiberglass, rigid (foil-faced fiberglass board) 9i9
NONE (wall cavity) 920
Other 92oa
(PLEASE SPECIFY)
100%
RIGID FIBERGLASS DUCTS
If you used any rigid fiberglass ducts, what was the typical
thickness of the fiberglass board used. (Sone)
1 inch [ ] i
2 inch [ ]2
Other [ ]3
(PLEASE SPECIFY) 926
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)
Wrapped with insulation
NOT insulated
Other
(PLEASE SPECIFY)
921
922
924
923
100%
METAL DUCT WRAP THICKNESS
If you used any duct insulation wrap, what was the typical
thickness? (^one)
1-1/2 inches or less [ ]i
2 inches [ ] 2
More than 2 inches \ 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) 927 928
Patio / Pool deck 929 930
Breezeway
Front porch
Front stoop
Side porch
Screened-in porch
. 931
.932
. 933
.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) 955
Concrete pavers
Brick
Tiles
Natural stone
Treated wood block
Treated lumber
Other
956
957
959a
(PLEASE SPECIFY)
960
100%
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 (Tiex®, CroiceDek® etc) _
PVC & other plastic (Azek®, etc) _
Brick
Tiles
Concrete (include stamped and stenciled)
Natural stone
. 961
.968
. 964
.971
. 966
.973
. 975b
100%
100%
.975
14
-------
DECK AND PORCH RAILINGS
What percent of your decks and porches had railings?
Decks % 1121 Porches %
What percent of your deck and porch railings consisted
primarily of the following materials?
DECKS PORCHES
Treated wood
Cedar
Redwood
Other untreated wood
Composite (Tiex^CroiceDek®, etc)
PVC & other plastic (Azek®, etc)
Aluminum
Wrought iron or steel
Masonry or concrete (all types)
Other
(PLEASE SPECIFY)
100%
1123
1125
1127
1129
1131
1133
1135
1137
1139
1141
100%
_1122b
.1124
.1126
.1128
.1130
.1132
.1134
.1136
.1138
.1140
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 981
Other 982
(PLEASE SPECIFY)
100%
SWIMMING POOLS
What percent of your homes included their own swimming pool
as part of the sales contract? ME
SFD SEA BUILDINGS
70 983
What was the typical size of the swimming pool?
Average size of SF Detached pool:
Average size of SF Attached pool:
Average size of Multifamily pool:
984
FT. X
FT. X
FT. X
985
FT.
FT.
FT.
SWIMMING POOL MATERIAL
What was the primary method used for constructing swimming
pools?
(•S'one)
Cast-in-place concrete [ ] i
Shotcrete (gunnite) [ ] 2
Other [ 1,
(PLEASE SPECIFY)
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 LF 988 LF 999
SF Attached Houses LF 988a LF 999a
Multifamily Buildings LF 988b LF 999b
Totals need not add to 100%
What was the typical fence /wall height?
SF Detached Houses
SF Attached Houses
Multifamily Buildings
Fence / Landscape /
Privacy Wall Retaining Wall
FT 989 FT i ooo
FT 989a FT i oooa
FT 989b FT l
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 990
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 &woodfibercomposite(Tiex, 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
. 991
. 992
. 993
. 993E
. 993b
. 997d
. 993c
. 993a
. 994
. 997
. 997b
. 996
. 1001
. 1002
. 1006
100%
100%
If you built wood fence/privacy walls, what percent were:
Treated wood 977
Cedar 978
Redwood 978a
Other untreated wood 979
100%
15
-------
HOMES FOR OLDER BUYERS
What percent of your homes were:
Constructed in "active adult" or age-restricted
communities
Sold to occupants over the age of 55
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
.788
100%
. 790
793
100%
803
796
SEALING METHODS OF HOUSES
WITH SLAB OR BASEMENT FOUNDATIONS
How do you seal your slabs? If you don't seal, S "NO slab
sealing method used."
(•^ all that apply)
NO slab sealing method used
Polyethylene or other membrane under slab
Membrane on foundation walls below grade
Caulk around slab, wall openings and slab joints
Seal interior of foundation walls
Locate sump access outside of basement
Install air tight sump pit covers
Other
(PLEASE SPECIFY)
RADON TESTING
What percent of your homes were tested for radon? %
Of the houses tested for radon, what percent needed further work
to reduce radon to less than 4pd/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
$450 to $549
$550 to $649
$650 to $749
$750 to $849
$850 to $1049
$1050 or more
PLUMBING FIXTURES
What was the typical number of plumbing fixtures installed in
each of your homes?
SFD SFD SFD SEA ME
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
vlO v!9 v28 v37
v20 v29 v38
v!2 v21 v30 v39
v!3 v2
v31 v40
v!4 v23 v32
v41
v6 v!5 v24 v33 v42
v!6 v25 v34 v43
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)
Undermount (sub-mount or under-counter)
Other
(PLEASE SPECIFY)
. v95
. v96
. v97
100%
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.)
Acrylic
Other
(PLEASE SPECIFY)
100%
. v58
. v59
. v60
. v61
. v62
. v62c
v62a
. v62b
16
-------
KITCHEN SINK BASINS
What percent of your kitchen sinks had the following number of
basins?
Single basin
Double basin
Triple basin
Other
(PLEASE SPECIFY)
100%
KITCHEN SINK FAUCETS
What percent of your kitchen sink faucets had the following
control types:
Single control (handle or lever) v2l
Two controls (one for hot and one for cold) v2.
100%
What percent of your kitchen sink faucets had the following
finishes:
Chrome V203
Brass / Gold V204
Bronze (oil rubbed, polished, brushed, etc.) V2os
Solid color (almond, white, black, biscuit, etc.) v206
Nickel / Pewter v207
Stainless steel
Other
(PLEASE SPECIFY)
v208
v209
100%
LAVATORY SINK TYPE
What percent of the lavatory sinks you installed were:
One-piece sink and countertop v46
Drop-in (self-rimming, overmount) v47
Wall-hung v48
Pedestal v50
Undermount (sub-mount or under-counter) v49
Vessel v49a
100%
LAVATORY SINK MATERIAL
What percent of all the lavatory sinks you installed were:
Vitreous china (ceramic) v51
Enameled cast iron v52
Enameled steel (include Americast®) v53
Cultured marble V54
Coated fiberglass vss
Acrylic vse
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) v211
Two controls (one for hot and one for cold) V2i2
100%
What percent of your lavatory sink faucets had the following
finishes:
Chrome V2is
Brass / Gold V2i4
Bronze (oil rubbed, polished, brushed, etc.) V2is
Solid color (almond, white, black, biscuit, etc.) V2ie
Nickel / Pewter v217
Stainless steel
Other
(PLEASE SPECIFY)
v218
v219
100%
BATHTUB AND WHIRLPOOL SURROUNDS
What percent of the separate bathtubs and whirlpool baths you
installed had site-constructed surrounds of the following
materials?
NO separate bathtub surrounds were constructed % v7e
Ceramic tile % v7i
Marble, slate, or other natural stone % v7ia
Solid surface (e.g., Corian®, Avonite®, etc.) % v72
High-pressure laminate (e.g., Formica, Wilsonart) % v73
Fiberglass / Plastic % v73a
Cultured marble % v74
Other % V75
(PLEASE SPECIFY)
100%
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
Solid-surface (e.g., Swanstone®, Avonite®' etc.)
Other
(PLEASE SPECIFY)
100%
. v63
. v63m
. v64
v64m
. v64a
. v65
. v66
. v67
. v68
. v69
. v70
. v70a
17
-------
WHIRLPOOL BATHTUBS
What percent of your homes had whirlpool baths?
SFD SFD SFD SFA MF
Starter Move-up Luxury Units Units
* » » » »
Whulpool bathtubs
v2w
vllw v20w
v29w
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
Solid-surface (e.g., Swanstone®, Avonite®' etc.) V70w
Other v70aw
v63w
v63wm
. v64w
v64wm
. v64aw
. v65w
v66w
. v67w
. v68w
. v69w
100%
(PLEASE SPECIFY)
TUB / SHOWER DOORS
What percent of the tubs, showers, and whirlpool baths you
installed had shower doors?
Bathtubs (non-whirlpool)
Showers
Whirlpool baths
v77
v77a
Totals need not add to 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.) _ v?8
High pressure laminate (eg, Formica®, Wilsonart®) _ v79
Cultured marble
Other _
(PLEASE SPECIFY)
Manufactured units of:
Coated fiberglass, one-piece
Coated fiberglass, multi-piece
Acrylic, one-piece _
Acrylic, multi-piece _
Other
v80
v81
(PLEASE SPECIFY)
. 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 v22i
Single control, twisted to turn on water v222
Two controls (one for hot and one for cold) V223
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 / Pewter v228
Stainless steel V229
Other v230
(PLEASE SPECIFY)
100%
STEAM GENERATORS
What percent of all the tubs, showers, and whirlpool baths you
installed had Steam Generators?
Bathtubs
Showers
Whirlpools
. v234
. v235
. v236
SHOWERHEADS
What percent of the bathtubs and showers you installed had
showerheads of the following types:
Standard / Fixed showerhead v:
Hand-held showerhead v2
Massaging showerhead V2
Thermostatic valves
Body sprays
Steam head
Other
v252
v253
v254
(PLEASE SPECIFY)
v255
What percent of the bathtubs and showers you installed had the
following:
More than 1 Standard showerhead v2si
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 one casting) v85j
Two piece V85 2
100%
What percent of the toilets had the following bowl styles?
Elongated v85_3
Standard vss 4
100%
What percent of your toilets were dual flush?
Percent of toilets with Dual Flush v85_5
18
-------
TOILET BRANDS
Of all the toilets you installed last year, what percent were the
following brands?
Percent
American Standard
Briggs
Crane
Eljer
Gerber
Kohler
Mansfield
Sterling
Toto
Universal-Rundle
St. Thomas Creations
Other
v85
v85b
v85c
v86
v86a
v86b
v86c
v87
v87a
v87b
v87c
(PLEASE SPECIFY)
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
. a!2
APPLIANCES
RANGES, COOKTOPS & OVENS
What percent of your homes were equipped with ranges or
cooktops and ovens that were: MF
SFD SFA UNITS
Freestanding al a6 a
Slide-in a2 a?
Drop-in a3 a8 al3
Cooktop & wall oven(s) a4 a9 ai4
NO range / cooktop / oven a5 alo ais
100% 100% 100%
WALL OVEN CONFIGURATION
What percent of your new homes with built-in wall ovens had:
A single wall oven a34
Two separate wall ovens a35
Stacked double ovens in a single unit a36
100%
BURNER TYPE
What percent of the cooking appliances you installed had the
following types of burners? RANGES COOKTOPS
Electric
Halogen burner / smoothtop a22 328
Smoothtop, not halogen a23 a29
Conventional heat coils a24 a3o
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
. a!6
. a!7
. a!8
. a!9
. a!8a
. a!9n
. a20
. a21
. a21a
Gas
Electric _
Oil
100% 100% 100% 100%
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 a64 aes
Top unit of double wall
OVen a60a a64a a68i
NO microwave oven
. a58
. a58a
. a59
a62 a66
a62a a66a
a63 a67
100%
a65
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,
freezer below _ a7i _ a75 _ a79
Side-by-side
refrigerator / freezer _ a72 _ a76 _ a80
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
. a84
. a87
100%
100%
100%
. a90
19
-------
CLOTHES WASHERS
What percent of your homes were equipped with clothes
washers that were:
SFD SFA MF UNITS
Top loading
washing machine
Front loading
washing machine
NO washing machine
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:
. a94
a97
WATER WASTE
SERVICE DISTRIBUTION & VENT
. a92
. a93
100% 100% 100%
CLOTHES DRYERS
What percent of your homes were equipped with clothes dryers
that were:
Electric dryer
Gas powered dryer
NO clothes dryer
SFD SFA MF UNITS
alOO a!03 a!06
alOl a!04 a!07
Copper
PVC or CPVC
Polyethylene (PE)
PEXorPEX-AL-PEX
Steel / Cast iron
ABS
100%
. v210s
. v211s
. v212s
. v213s
. v215s
100%
100%
. v215w
. v216w
100%
a!02
. a!05
100%
100%
If you used PEX plumbing systems, what percent of the piping,
fittings, and manifolds were the following brands:
OTHER APPLIANCES & HOME FEATURES
PIPING FITTINGS MANIFOLDS
v217m
v218m
19m
2Qm
v221m
22m
v223m
v224m
25m
v226m
27m
What percent of your homes were
appliances?
SFD
Garbage disposal
Trash compactor
Hot water dispenser
Central vacuum -
full system
Central vacuum -
pre-pipe only
Elevator
Standby generator
Water softener
Hot water recirculation
piping
Code required fire
sprinkler system
Non-code required fire
sprinkler system
equipped with the following
MF
SFA UNITS
all 3 all? a!21
all 4 all8 a!22
allS al!9 a!23
al!6 a!20 a!24
a!41 a!42 a!43
a!44 a!45 a!46
a!47 a!48 a!49
a!47b a!48b a!49b
a!47d a!48d a!49d
a!47c a!48c a!49c
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 sioi S106
PEX
Steel/Iron
Copper
Other
s!02 s!07
s!03 s!08
si 04 si 09
s!05 sllO
Bow
IPEX
JM Eagle
NIBCO
Rehau
Sioux Chief
Uponor $mefyWiio)
Viega (lorralyVargBKl)
Watts
Zurn
Don't know
Other
v217p v217f
v218p v218f
v219p v219f
v220p v220f
v221p v221f
v222f
v223p v223f
v224p v224f
v225p v225f
v227p v227f
v228o v228f
Vz
v^
v^
vl
v^
v^
v^
v^
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't know
100% 100% 100% 100% 100%
v229s v229m v2291 v229t v229a
What percent of the fittings for your PEX plumbing systems were:
(PLEASE SPECIFY)
100%
100%
SFD SFD SFD SFA MF
Starter Move-up Luxury Units Units
What percent of your fire sprinkler systems were:
SFD & SFA MF
Stand-alone fire
sprinkler systems sm sn3
Combined plumbing and fire
sprinkler systems Sn2 Sii4
100%
100%
Engineeredplastic
Copper/Brass
Other
Don't know
100% 100%
v230s v230m
100%
V2301
100% 100%
v230t v230a
20
-------
HYDRONIC RADIANT HEAT
What percent of your homes had hydronic radiant heat
installed in:
SFD SFD SFD SFA MF
HEATING DISTRIBUTION SYSTEMS
What percent of your homes with primary heating systems had
the following heating distribution systems:
»
None
Lessthan25%of
square footage
25-50%of
square footage
50% or mote
square footage
*
» » »
100% 100% 100% 100% 100%
v231s v231m v2311 v231t v231a
If you used PEX radiant systems, what percent of the piping,
manifolds, and controls were the following brands:
PIPING MANIFOLDS CONTROLS
BOW V232o v232m v232c
Caleffi
Heat Link
Heat-Timer
Honeywell
IPEX
JM Eagle
Rehau
Roth
Tekmar
Uponor (JmrefyWiio)
Viega (&rrefyVargBK|)
Watts
Zurn
Don't know
Other
v234p
v237p
v238p
v239p
v240p
v242p
v243p
v244p
v246p
v247n
100%
v233m
v234m v234c
v235c
v236m v236c
v237m v237c
v238m v238c
v239m v239c
v24Qm v240c
v241c
v243m v243c
v247m v247c
100% 100%
Forced Air — one zone only
Forced Air — two or more zones
Hydronic — radiant floor
Hydronic — baseboard or radiators
Another type of distribution system
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 AC unit
Two or more AC units
Ductless heat pump or AC
hl!2
hl!3
hl!4
hl!5
hl!6
hi 21
hi 22
hi 23
hi 24
hi ?S
100%
HVAC SYSTEM FEATURES
What percent of your homes had the following as part of their
HVAC systems:
High performance air cleaner (HEP A, 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%
80% to 89.9%
90% to 95%
95.1% or greater
Don't know
hi 42
hi 43
hi 44
hi 45
hi 46
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 MOI
Standard heat pump w/ gas or propane backup hi 02
Geothermal heat pump hl03
Gas or propane furnace or boiler hl04
Oil furnace or boiler hl05
Electric furnace, baseboard, or radiant hioe
No primary heating system hl07
100%
100%
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!51
. h!52
. h!53
.hi 54
. h!55
.hi 56
. h!57
100%
21
-------
INFRASTRUCTURE
What percent of your single family detached dwellings were
located:
STANDBY GENERATORS
What percent of your standby generators were:
In residential developments
Not in residential developments
What percent of your homes & mi
residential developments hadfror
Concrete streets
Asphalt streets
Other:
SFD
h201
h202
100%
iltifamily buildings located in
itage on the following:
SFD SFA & MF
h203 h206
h204 h207
h205 h208
(PLEASE SPECIFY) 100% 100%
What percent of your homes and multifamily buildings located
in residential developments were on streets with the following:
SFD SFA & MF
Sidewalks h209 11214
Curbs and gutters
Curbs only, no gutters
Gutters only, no curbs
No curbs or gutters
h210 h215
h211 h216
h21 2 h21 7
h213 h21R
Total need not add to 100%
Natural gas
Propane/LP gas
Gasoline
Diesel
Other
What percent of your standby generators were:
Not permanently installed (portable)
Permanently installed 7kW to 20kW
Permanently installed over 20kW
el 06
2107
2108
2109
2110
100%
2114
2115
2116
100%
What percent of your standby generator installations included:
Manual transfer switch 2ll 4
Automatic transfer switch
100%
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)
PLEASE SELECT ONE OF THE FOLLOWING GIFTS:
[ ] Apparel Grab Bag (S) [ ] Apparel Grab Bag (XL)
[ ] Apparel Grab Bag (M) [ ] Apparel Grab Bag (XXL)
[ ] Apparel Grab Bag (L) [ ] Apparel Grab Bag (XXXL)
[ ] 100' Contractor Measuring Tape
[ ] 8GB USB Flash Drive
[ ] Laser Level
Thank You for Your Time and Cooperation!
Comments or questions? Contact Joanne McAlpin atjmcalpin@nahbrc.com or 1-800-638-8556 ext. 6306.
Returning the Questionnaire
1. If your name or address differs from the address label, please make appropriate corrections (this will be used to send your gift)
2. If you'd like to participate in online surveys and earn more free gifts, please include your email address above
3. Place your completed survey in the postage-paid return envelope (see center of survey) and drop it in the mail
22
-------