&EPA
United States
Environmental Protection
Agency
VERSION 1 (REV. 01)
Indoor airPLUS
CONSTRUCTION SPECIFICATIONS
EPA Indoor
airPLUS
www.epa.gov/indoorairplus
Indoor Air Quality (IAQ)
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Contents
About the Indoor airPLUS Construction Specifications i
What's New in Version 1 (Rev. 01)? i
Eligibility and Verification Requirements i
Terms Used in This Document i
Indoor airPLUS Verification Checklist ii
Guidance for Completing the Indoor airPLUS Verification Checklist iii
Indoor airPLUS Construction Specifications 1
1. Moisture Control 1
2. Radon Control 3
3. Pest Barriers 4
4. HVAC Systems 5
5. Combustion Pollutant Control 6
6. Low Emission Materials 7
7. Home Commissioning 8
Abbreviations 9
References 9
Climate Zones Map 11
About the Indoor airPLUS Construction Specifications
These specifications were developed by the U.S. Environmental Protection Agency (EPA) to recognize new homes equipped with a
comprehensive set of indoor air quality (IAQ) features. They were developed with significant input from stakeholders, based on best
available science and information about risks associated with IAQ problems, and balanced with practical issues of cost, builder production
process compatibility, and verifiability.
NOTE: Although these measures are designed to help improve IAQ in new homes compared with homes built to minimum code, they alone
cannot prevent all IAQ problems. For example, occupant behavior, such as smoking indoors, and system maintenance are also important.
What's New in Version 1 (Rev. 01)?
Indoor airPLUS VI (Rev. 01) contains the first revisions to the original Indoor airPLUS Construction Specifications issued in 2009. This
revision is designed to:
• Improve the alignment of the Indoor airPLUS and ENERGY STAR for Homes requirements and provide a revised layout that clearly
outlines the Indoor airPLUS requirements that are now satisfied by completion of the ENERGY STAR checklists and the additional
Indoor airPLUS (Rev. 01) requirements that must be met to achieve Indoor airPLUS certification.
• Provide a clearer, simpler version of the Verification Checklist.
• Provide alternate pathways to meet program requirements that address the wide variety of construction materials and techniques
currently available.
Eligibility and Verification Requirements
For a home to earn the Indoor airPLUS label, it must also earn the ENERGY STAR Version 3 label for Certified
Homes. Requirements for both programs can be verified and homes can be reported simultaneously. Verification
can be completed during the ENERGY STAR inspection process and must be conducted by a Provider accredited
by the Residential Energy Services Network (RESNET) in accordance with RESNET standards and all applicable
codes. Instructions for Indoor airPLUS verification are listed below in the Verification Checklist.
Qualified homes earn the
Terms Used in This Document
EXCEPTIONS to the requirements described in these construction specifications are noted as appropriate. ENERGY STAR label.
For climate exceptions, refer to the 2009 International Energy Conservation Code (IECC) Climate Zone map
(Figure 301.1). Climate Zone names may include a number for the temperature zone and a letter for the
moisture zone (e.g., Zone 3C refers to coastal California only).
NOTES provide additional information to clarify specification requirements.
ADVISORIES provide additional guidance to be considered, but are not specification requirements.
PERFORMANCE TEST ALTERNATIVES describe alternate compliance approaches where performance testing
is practical and results are comparable to those of the prescriptive best practices required in the specification.
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United States
Environmental Protection
Agency
Indoor airPLUS Version 1 (Rev. 01)
Verification Checklist
Home Address: City: State: Zip:
Section
ENERGY STAR V3
Checklists
Moisture Control
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HVAC Systems
Combustion
Pollutants
Materials
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Requirements (Refer to full Indoor airPLUS Construction Specifications for details)
Note: The Rev. 01 checklist has been modified to reflect only the additional Indoor airPLUS
requirements and their corresponding section numbers that must be met after completing the ENERGY
STAR checklists. ENERGY STAR remains a prerequisite for Indoor airPLUS certification.
Thermal Enclosure System Rater Checklist completed.
Water Management System Builder Checklist completed.
HVAC System Quality Installation Contractor Checklist completed.
HVAC System Quality Installation Rater Checklist completed.
1.1
1.2
1.4
1.7
1.11
2.1
3.2
4.1
4.2
4.3
4.7
5.1
5.2
5.3
5.4
6.1
6.2
6.3
7.1
7.2
7.3
Drain or sump pump installed in basements and crawlspaces (Exception: free-draining soils). In
EPA Radon Zone 1, check valve also installed.
Layer of aggregate or sand (4 in.) with geotextile matting installed below slabs AND radon
techniques used in EPA Radon Zone 1.
Basements/crawlspaces insulated, sealed and conditioned (Exceptions: see spec).
Protection from water splash damage if no gutters (Exceptions: see spec).
Hard-surface flooring in kitchens, baths, entry, laundry and utility rooms, AND piping in exterior
walls insulated with pipe wrap.
Approved radon-resistant features installed in Radon Zone 1 homes.
Corrosion-proof rodent/bird screens installed at all openings that cannot be fully sealed
(Exception: dryer vents).
Equipment selected to keep relative humidity < 60% in "Warm-Humid" climates (Exception: see
spec).
Duct systems protected from construction debris AND no building cavities used as air supplies
or returns.
No air-handling equipment or ductwork installed in garage AND continuous air barrier in
adjacent assemblies.
Central forced-air HVAC system(s) have minimum MERV 8 filter AND no ozone generators in
home.
Emissions standards met for fuel-burning and space-heating appliances (Exception: see spec).
CO alarms installed in each sleeping zone (e.g., common hallway) according to NFPA 720.
Multifamily buildings: Smoking restrictions implemented AND ETS transfer pathways minimized.
Attached garages: Door closer installed on all connecting doors AND 70 cfm exhaust fan
installed in garage.
Certified low-formaldehyde composite wood materials AND structural plywood AND OSB PS1 or
PS2 compliant.
Certified low-VOC or no-VOC interior paints and finishes used.
Carpet, carpet adhesives CRI Green Label Plus AND carpet cushion CRI Green Label.
HVAC system and ductwork verified to be dry and clean AND new filter installed.
Home ventilated before occupancy.
Completed checklist and other required documentation provided for buyer.
Must
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Builder
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Rater
Verified
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Rater Name: Rater Pre-Drywall Inspection Date: Rater Initials:
Rater Name: Rater Final Inspection Date: Rater Initials:
Builder Employee: Builder Inspection Date: Builder Initials:
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Guidance for Completing the Indoor airPLUS Verification Checklist:
I. Only ENERGY STAR certified homes verified to comply with these specifications can earn the Indoor airPLUS label. See Indoor
airPLUS Construction Specifications for full descriptions of the requirements, terms, exceptions, abbreviations, references and
climate map used in this checklist. Verification is not complete until this checklist is completed in full and signed.
2. Check one box per line. Check "N/A" for specifications that do not apply for specific conditions (e.g., climate) according to the
exceptions described in the Indoor airPLUS Construction Specifications. Check either "Builder Verified" or "Rater Verified"
for all other items to indicate who verified each item. Items may be verified visually on site during construction, by reviewing
photographs taken during construction, by checking documentation, or through equivalent methods as appropriate.
3. The Rater who conducted the verification, or a responsible party from the Rater's company, must sign the completed verification
checklist. The builder must sign the checklist if any items in the "Builder Verified" column are checked, and by so doing
accepts full responsibility for verifying that those items meet Indoor airPLUS requirements.
4. The builder provides one copy of the completed and signed Indoor airPLUS Verification Checklist for the buyer. The HERS
Provider or Rater files a copy of the HERS and ENERGY STAR documentation (e.g., ENERGY STAR Qualified Homes Version 3
Inspection Checklists) for the home.
5. Raters who operate under a Sampling Provider are permitted to use a RESNET-approved sampling protocol for Indoor airPLUS
homes located outside California, and a sampling protocol approved by the California Energy Commission for homes located in
California, to verify any item designated "Rater Verified." For example, if the approved sampling protocol requires rating one in
seven homes, then the checklist will be completed for the one home that was rated. Only Raters are permitted to use sampling.
All items verified by the builder shall be verified for each qualified home. For example, if a Rater verifies 10 items on the Indoor
airPLUS Checklist and the builder verifies the remaining checklist items, then an approved sampling protocol is permitted to be
used only on the 10 Rater-verified items.
Notes:
For further information on the Indoor airPLUS program, visit epa.gov/indoorairplus.
Qualified homes earn the
Indoor airPLUS label.
Place it next to the
ENERGY STAR label.
ENERGYSTAR
All Indoor airPLUS qualified homes meet strict
guidelines for energy efficiency set by ENERGY STAR,
the nationally-recognized symbol for energy efficiency.
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Indoor airPLUS Construction Specifications
Version 1 (Rev. 01)
All ENERGY STAR for Homes Version 3 checklists must be successfully completed and reported to achieve Indoor airPLUS certification.
ENERGY STAR checklist items that satisfy Indoor airPLUS requirements are only summarized below; please refer to the noted ENERGY
STAR checklist item for the full description of the requirement.
ENERGY STAR checklists are referenced as follows: TES =Thermal Enclosure System Rater Checklist, HVAC-C = HVAC System Quality
Installation Contractor Checklist, HVAC-R = HVAC System Quality Installation Rater Checklist, WMS = Water Management System
Builder Checklist.
1. Moisture Control
1.1 Site and Foundation Drainage
NOTE; Completion of the ENERGY STAR checklists now satisfies
the following Indoor airPLUS requirements:
• Slope patio slabs, walks and driveway; tamp back-fill to prevent
sett/ing; AND slope the final grade away from the foundation
(WMS 1.1 and 1.2).
• Swales or drains designed to carry water away from the
foundation are permitted to be provided as an alternative to
the slope requirements for any home, and shall be provided for
a home where setbacks limit space to less than 10 ft. (WMS
1.land 1.2).
• Install protected drain tile at the footings of basement and
crawlspace walls. Surround each drain tile pipe with washed or
clean gravel wrapped with fabric cloth, or install an approved
Composite Foundation Drainage System (CFDS) (WMS 1.8).
Additional Indoor airPLUS Requirements:
• Install a drain or sump pump in basement and
crawlspace floors, discharging to daylight at least 10 ft.
outside the foundation or into an approved sewer system.
• Exceptions:
o Slab-on-grade foundations.
o In areas of free-draining soils — identified as Group 1
(Table R405.1, 2009 IRC) by a certified hydrologist,
soil scientist, or engineer through a site visit —
installation of a drain or sump pump is not required.
• In EPA Radon Zone 1, if a drain tile discharges to
daylight install a check valve at the drain tile outfall (see
Specification 2.1).
1.2 Capillary Break Installation
NOTE: Completion of the ENERGY STAR checklists now satisfies
the following Indoor airPLUS requirements:
• Install polyethylene sheeting or extruded polystyrene (XPS)
insulation beneath concrete slabs, including basement floors.
Ensure sheeting is in direct contact with the concrete slab
above (WMS 1.3).
• Install a capillary break at all crawlspace floors using > 6 mil
polyethylene sheeting, lapped 6 to 12 in. (WMS 1.4).
Additional Indoor airPLUS Requirements:
• Under the polyethylene sheeting or extruded polystyrene
(XPS) insulation installed to meet ENERGY STAR Water
Management System Builder Checklist Item 1.3:
o Install a 4 in. layer of 1/2 in. diameter or greater clean
aggregate; OR
o Install a 4 in. uniform layer of sand, overlain with
either a layer of geotextile drainage matting throughout
or strips of geotextile drainage matting along the
perimeter installed according to the manufacturer's
instructions.
o Exception: Dry climates, as defined by 2009 IECC
Figure 301.1, not including EPA Radon Zone 1.
• Note: In EPA Radon Zone 1 (see Specification 2.1):
o Overlap polyethylene sheeting by 6 to 12 in. at the
seams.
o Do not use extruded polystyrene (XPS) insulation
beneath concrete slabs, including basement floors.
o ENERGY STAR staking method for crawlspaces with no
slab is not allowed.
• Note: 10 mil polyethylene is recommended if crawlspace
floors are not covered with a concrete slab.
1.3 Damp-Proofing and Waterproofing Below-Grade
Exterior Walls
NOTE: Completion of the ENERGY STAR checklists now satisfies
the following Indoor airPLUS requirements:
• Finish all masonry and concrete walls (e.g., poured concrete,
concrete masonry, insulated concrete forms) with a damp-proof
coating (WMS 1.5).
• Finish all wood-framed walls with polyethylene and adhesive or
other equivalent waterproofing (WMS 1.5).
No additional Indoor airPLUS Requirements
Indoor airPLUS Version 1 (Rev. 01) CONSTRUCTION SPECIFICATIONS (February 2C
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1.4 Basement and Crawlspace Insulation and Conditioned Air
1.7 Gutters, Downspouts and Site Drainage
NOTE: Completion of the ENERGY STAR checklists now satisfies
the following Indoor air PLUS requirement:
• All floors above unconditioned spaces shall be insulated to the
2009 IECC and sealed to prevent air infiltration (TES 2 and 3),
Additional Indoor airPLUS Requirements:
• Insulate crawlspace and basement perimeter walls
according to 2009 IRC Table Nl 102.1 or 2009 IECC
Table 402.1.1 (also see Specification 1.12).
• Seal crawlspace and basement perimeter walls to prevent
outside air infiltration.
• Provide conditioned air at a rate not less than 1 cfm
per 50 sq. ft. of horizontal floor area. If radon-resistant
features are required (see Specification 2.1), do not
install exhaust ventilation, as described in 2009 IRC
section R408.3.2.1.
• Exceptions:
o Homes built in areas designated as flood zones
(conditioned crawlspaces not recommended for use in
flood zones).
o Raised pier foundations with no walls.
o Dry climates, as defined by 2009 IECC Figure 301.1.
o Marine climates, as defined by 2009 IECC Figure
301.1, if no air handler or return ducts are installed in
the crawlspace.
1.5 Drainage Plane and Drainage System
NOTE: Completion of the ENERGY STAR checklists now satisfies
the following Indoor air PLUS requirements:
• Install a continuous drainage plane behind exterior wall
cladding that overlaps flashing and is fully sealed at all
penetrations (WMS 2,2),
• Install flashing or an equivalent drainage system at the bottom
of exterior walls to direct water away from the drainage plane
and foundation (WMS 2.1).
No additional Indoor airPLUS Requirements
1.6 Window and Door Openings
NOTE: Completion of the ENERGY STAR checklists now satisfies
the following Indoor airPLUS requirement:
• Fully flash all window and door openings, including pan
flashing over the rough sill framing, side flashing that extends
over pan flashing and top flashing that extends over side
flashing (WMS 2.3).
NOTE: Completion of the ENERGY STAR checklists now satisfies
the following Indoor airPLUS requirements:
• Direct roof water away from the house using gutters and
downspouts that empty into lateral piping on a sloping finish
grade (WMS 3.2); OR
• Direct roof water to an underground catchment system not
connected to the foundation drain system that discharges water
> 10 ft. from foundation (WMS 3.2).
Additional Indoor airPLUS Requirements
• Provide extra protection for water splash damage on
homes meeting one of the following ENERGY STAR
exceptions for gutters and downspouts: slab on grade
homes, homes that deposit rainwater to a grade-level
rock bed with a waterproof liner and drain pipe, or
homes that use a continuous rubber membrane system.
Protection for water splash damage shall be met by one
of the following:
o Extend the foundation walls at least 16 in. above final
grade; OR
o Provide a drip line that is horizontally 16 in. away from
the edge of the foundation wall; OR
o Use cladding material that can tolerate regular
wetting and install a well-sealed, continuous drainage
plane that extends at least 16 in. above final grade
(e.g. brick veneer, stone cladding with self-adhering
moisture control membrane).
• Exceptions:
o Dry climates, as defined by 2009 IECC Figure 301.1.
o Homes with rainwater harvesting systems that are
designed to properly drain overflow, meeting discharge-
distance requirements outlined in ENERGY STAR WMS
Item number 3.2.
1.8 Roof to Wall Intersections and Roof Penetrations
NOTE: Completion of the ENERGY STAR checklists now satisfies
the following Indoor airPLUS requirements:
• Fully flash all roof-to-wall intersections and all roof
penetrations using step flashing for conventional roofs or
continuous flashing for metal and rubber membrane roofs
(WMS 3.1).
• Install "kick-out" flashing at the low end of roof-to-wall
intersections (WMS 3.1).
No additional Indoor airPLUS Requirements
No additional Indoor airPLUS Requirements
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1.9 Roof Valleys and Decking
NOTE: Completion of the ENERGY STAR checklists now satisfies
the following Indoor air PLUS requirement:
• Install a self-sealing bituminous membrane or the equivalent
at all valleys and roof decking penetrations for durability at
potential failure points (WMS 3.3).
No additional Indoor airPLUS Requirements
1.10 Roof Eaves
NOTE: Completion of the ENERGY STAR checklists now satisfies
the following Indoor air PLUS requirement:
• Install ice flashing over the sheathing at eaves to provide
protection from ice dams (WMS 3.4).
• Extend a self-sealing bituminous membrane or the equivalent
("ice flashing") from the edge of the roof line to > 2 ft. up roof
deck from the interior plane of the exterior wall (WMS 3.4).
No additional Indoor airPLUS Requirements
1.11 Moisture-Resistant Materials and Moisture-Protective
Systems
NOTE: Completion of the ENERGY STAR checklists now satisfies
the following Indoor airPLUS requirements:
• Install moisture-resistant backing material behind tub and
shower enclosures (WMS 4.2).
• Install a corrosion-resistant drain pan properly draining to a
conspicuous point of disposal (HVAC-R 12.1).
Additional Indoor airPLUS Requirements:
• Install only water-resistant hard-surface flooring in
kitchens, bathrooms, entryways, laundry areas and utility
rooms.
• Insulate water supply pipes in exterior walls with pipe
wrap.
1.12 Class 1 Vapor Retarders
NOTE: Completion of the ENERGY STAR checklists now satisfies
the following Indoor airPLUS requirement:
• Do not install Class 1 vapor retarders on the interior side of
vapor permeable insulation in below-grade exterior walls or
in any exterior walls in Warm-Humid climates (WMS 1.6 and
4.3).
No additional Indoor airPLUS Requirements
1.13 Materials with Signs of Water Damage or Mold
NOTE: Completion of the ENERGY STAR checklists now satisfies
the following Indoor airPLUS requirements:
• Building materials with visible signs of water damage or mold
not installed or allowed to remain. If mold is present, effort
should be made to remove all visible signs of mold (e.g., by
damp wipe with water and detergent). If removal methods are
not effective, then the material shall be replaced. However,
stains that remain after damp wipe are acceptable. Lumber
with "sap stain fungi" is exempt from this Item as long the
lumber is structurally intact, (WMS 4.4).
• Do not enclose (e.g., with drywall) framing members and
insulation products having high moisture content, (Note:
Lumber should not exceed 18 percent moisture) (WMS 4.5).
• For wet-applied insulation, follow the manufacturer's drying
recommendations (WMS 4.5).
No additional Indoor airPLUS Requirements:
2. Radon
2.1 Radon-Resistant Construction
NOTE: Completion of the ENERGY STAR checklists now satisfies
the following Indoor airPLUS requirement:
• Air seal all sump covers (WMS 1.7).
Additional Indoor airPLUS Requirements:
• Construct homes in EPA Radon Zone 1 (see www.epa.
gov/radon/zonemap.html) with radon-resistant features to
conform to ASTM E1465; or IRC, Appendix F; or NFPA
5000, Chapter 49. Consult EPA's "Building Radon Out"
(EPA 402-K-01-002) for general guidance on installing
radon-resistant features.
Visually verify the following requirements:
o Capillary break installed according to Specification
1.2.
o A 3 or 4 in. diameter gas-tight vertical vent pipe,
clearly labeled to conform with the radon-resistant
standard used, e.g., "Radon Reduction System" or
"Radon Pipe" or "Radon System." The vent pipe shall
be connected to an open T-fitting in the aggregate
layer (or connected to geotextile drainage matting
according to the manufacturer's instructions) beneath
the polyethylene sheeting, extending up through the
conditioned spaces and terminating a minimum of 12
in. above the roof opening. For crawlspaces, install at
least 5 ft. of horizontal perforated drain tile on either
side of the T-fitting, attached to the vertical radon vent
pipe beneath the sheeting and running parallel to the
long dimension of the house.
o Radon fan installed in the attic (i.e., an active system)
OR an electrical receptacle installed in an accessible
attic location near the radon vent pipe (i.e., a passive
system) to facilitate future fan installation if needed.
o Foundation air sealing with polyurethane caulk or
the equivalent at all slab openings, penetrations and
control or expansion joints.
Indoor airPLUS Version 1 (Rev. 01) CONSTRUCTION SPECIFICATIONS (February 2C
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• Note: Consult local building codes to determine whether
additional radon requirements apply. In January 2013
ANSI-AARST published a standard of practice for
"Reducing Radon in New Construction of 1&2 Family
Dwellings and Townhouses (CCAH-2013)", available at
http://www.aarst.org/bookstore.shtml.
• Advisories:
1. Elevated levels of radon have been found in homes
built in all three zones on EPA's Map of Radon
Zones. Consult your state radon program for current
information about radon in your area. Go to http://
www.epa.gov/radon/whereyoulive.html and click on
your state for contact information.
2. EPA recommends, but does not require, that all
homes built with radon-resistant features in EPA
Radon Zone 1 pre-emptively include a radon vent
fan. EPA also recommends, but does not require,
radon-resistant features for homes built in EPA
Radon Zones 2 and 3. EPA further recommends that
all homes built in EPA Radon Zones 2 and 3 with
radon-resistant features be tested for radon prior to
occupancy. A radon vent fan should be installed
when the test result is 4 pCi/L (the EPA action level)
or more.
3. The U.S. Surgeon General and EPA recommend
that all homes built in Radon Zones 1, 2 and 3 be
tested for radon. Provide buyers with EPA's Citizen's
Guide to Radon, encourage them to test for radon
and refer them to http://www.epa.gov/radon for more
information.
4. If soil or groundwater contamination is suspected
on or near the building site (e.g., former industrial
sites), volatile chemical contaminants from soil gas
or vapor intrusion into a building may pose an IAQ
risk. In such cases, EPA recommends radon-resistant
features consistent with Specification 2.1, which can
minimize or prevent the vapor intrusion into a house.
See the EPA Vapor Intrusion Primer or ASTM E2600
for more information. You should also consult your
state, tribal, or local environmental regulatory agency
for information on the location of contaminated sites,
including those subject to Superfund (CERCLA),
Resource Conservation and Recovery Act (RCRA)
cleanup requirements, or the Brownfields program.
Visit EPA's "Where You Live" for more information.
3. Pest Barriers
3.1 Minimize Pathways for Pest Entry
NOTE: Completion of the ENERGY STAR checklists now satisfies
the following Indoor air PLUS requirements:
• Seal all penetrations and joints between the foundation and
exterior wall assemblies (TES 5).
• Air seal all sump covers (WMS 1.7).
No additional Indoor airPLUS Requirements
• Advisories:
1. When sealing larger gaps that provide potential points
of entry for rodents, copper or stainless steel wool is
recommended in addition to sealant.
2. Additional precautions should be taken in areas
classified as "Moderate to Heavy" termite infestation
probability (as identified by 2009 IRC Figure 301.2
[6]):
• Foundation walls should be solid concrete or
masonry with a top course of solid block, bond
beam, or concrete-filled block.
• Interior concrete slabs should be constructed with
6 x 6 in. welded wire fabric, or the equivalent,
and concrete walls should be constructed with
reinforcing rods to reduce cracking.
• Sill plates should be made of metal or
preservative-treated wood.
3. Additional precautions should be taken in areas
classified as "Very Heavy" termite infestation
probability (as identified by 2009 IRC Figure
301.2[6]) i.e., Alabama, Florida, Georgia, Louisiana,
Mississippi, South Carolina and parts of California
and Texas:
• Foam plastic insulation should not be installed on
the exterior face of below-grade foundation walls
or under slabs.
• Foam plastic insulation installed on the exterior
of above-grade foundation walls should be kept
a minimum of 6 in. above the final grade and
any landscape bedding materials and should
be covered with moisture-resistant, pest-proof
material (e.g., fiber cement board or galvanized
insect screen at the bottom-edge of openings).
• Foam plastic insulation applied to the interior side
of conditioned crawlspace walls should be kept a
minimum of 3 in. below the sill plate.
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3.2 Rodent/Bird Screens for Building Openings
Indoor airPLUS Requirements:
• Provide corrosion-proof rodent/bird screens (e.g., copper
or stainless steel mesh) for all building openings that
cannot be fully sealed and caulked (e.g., ventilation
system intake/exhaust outlets and attic vent openings).
• Exception: This requirement does not apply to clothes
dryer vents.
4. HVAC Systems
4.1 HVAC Sizing and Design
NOTE: Completion of the ENERGY STAR checklists now satisfies
the following Indoor air PLUS requirements:
• Properly size all heating and coo/ing equipment to
accommodate design loads for each room as determined using
ACCA Manual J, ASHRAE Handbooks, or equivalent software, as
well as the pressure drop from all specified filters (HVAC-C 2).
Additional Indoor airPLUS Requirements:
• In "Warm-Humid" climates as defined by 2009 IECC
Figure 301.1 (i.e., Climate Zone 1 and portions of
Zones 2 and 3A below the white line), equipment shall
be installed with sufficient latent capacity to maintain
indoor relative humidity (RH) at or below 60 percent.
This requirement shall be met by either:
o Additional dehumidification system(s), OR
o A central HVAC system equipped with additional
controls to operate in dehumidification mode.
• Exception: Climate Zones 4-8, 3B, 3C and the portions
of 3A and 2B above the white line as shown by 2009
IECC Figure 301.1.
• Advisory: Although not required to meet this
specification, independent dehumidification is
recommended in Climate Zones 4A and 3A above the
white line as shown in 2009 IECC Figure 301.1.
4.2 Duct System Design and Installation
NOTE; Completion of the ENERGY STAR checklists now satisfies
the following Indoor airPLUS requirements:
• Design all duct systems according to ACCA Manual D, ASHRAE
Handbooks, or equivalent software (HVAC-C 2).
• Ensure that all duct systems are installed to be substantially
airtight and properly balanced (HVAC-R 2 and 4).
Additional Indoor airPLUS Requirements:
• Do not use building cavities as part of the forced air
supply or return systems.
• Either cover duct openings throughout construction to
protect from construction debris or vacuum out ducts
thoroughly prior to installing registers, grilles and
diffusers (see Specification 7.1).
• Advisory: Seams in the HVAC cabinet, plenum and
adjacent ductwork shall be sealed with mastic systems,
tape that meets the applicable requirements of UL 181a
or UL 181b, or gasket systems.
4.3 Location of Air-Handling Equipment and Ductwork
Indoor airPLUS Requirement:
• Do not locate air-handling equipment or ductwork in
garages.
• Note: Ducts and equipment may be located in framing
spaces or building cavities adjacent to garage walls or
ceilings if they are separated from the garage space with
a continuous air barrier (see ENERGY STAR Thermal
Enclosure System Rater Checklist).
4.4 Room Pressure Differentials
NOTE: Completion of the ENERGY STAR checklists now satisfies
the following Indoor airPLUS requirement:
• Minimize room pressure differentials for any bedroom (as
defined by RESNET standards) that does not have a dedicated
return (HVAC-R 2.8).
No additional Indoor airPLUS Requirements
4.5 Mechanical Whole-House Ventilation
NOTE: Completion of the ENERGY STAR checklists now satisfies
the following Indoor airPLUS requirements:
• Provide mechanical whole-house ventilation meeting all
requirements of ASHRAE 62.2-2010 (HVAC-C 1).
• Test airflows to ensure they meet ASHRAE 62.2-2010
minimum requirements (HVAC-R 5.1).
• Visually verify the following requirements:
o Transfer air is not used to meet ventilation requirements
(HVAC-R 7.4).
o Outdoor air inlets are located a minimum of 10 ft, from
contaminant sources (HVAC-R 7.1).
• Advisory: Outdoor air ducts connected to the return side
of an air handler should be used as supply ventilation
only if the manufacturers' requirements for return
air temperature are met (e.g., most manufacturers
recommend a minimum of 60 degrees Fahrenheit air flow
across furnace heat exchangers).
4.6 Local Exhaust for Known Pollutant Sources
NOTE: Completion of the ENERGY STAR checklists now satisfies
the following Indoor airPLUS requirements:
Indoor airPLUS Version 1 (Rev. 01) CONSTRUCTION SPECIFICATIONS (February 2C
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• Provide local mechanical exhaust ventilation to the outdoors
in each bathroom and kitchen, meeting ASHRAE 62.2-2010
Section 5 requirements (HVAC-R 8,1 and 8.2).
• Vent a/1 conventional clothes dryers directly to the outdoors
(HVAC-R 8.5).
No additional Indoor airPLUS Requirements
4.7 Filtration for Central Forced-Air HVAC Systems
NOTE: Completion of the ENERGY STAR checklists now satisfies
the following Indoor air PLUS requirement:
• Equip all filter access panels with gasket material or
comparable sealing mechanism and ensure access panels fit
snugly against the exposed edge of the installed filter when
closed to prevent bypass (HVAC-R 11.4).
Additional Indoor airPLUS Requirements:
• Install only HVAC filters that are rated MERV 8 or higher
according to ASHRAE 52.2-2007 (at approximately 295
fpm).
o Advisory: Filters perform best when the filter rack
design includes the following features, which are also
included in some manufacturers' filter media boxes:
• Flexible, air-tight (e.g., closed-cell foam) gasket
material on the surface that contacts the air-leaving
(downstream) side of the filter.
• Friction fit or spring clips installed on the upstream
side of the filter to hold it firmly in place.
• Do not install any air-cleaning equipment designed to
produce ozone (i.e., ozone generators).
5. Combustion Pollutant Control
5.1 Combustion Equipment Located in Conditioned Spaces
NOTE: Completion of the ENERGY STAR checklists now satisfies
the following Indoor airPLUS requirements:
• Mechanically draft or direct vent all gas- and oil-fired furnaces,
boilers and water heaters located in conditioned spaces
(HVAC-R 10.1).
• Fireplaces that are not mechanically drafted or direct-vented
to the outdoors must meet maximum allowed exhaust flow or
pressure differential (HVAC-R 10.2).
Additional Indoor airPLUS Requirements:
• Do not install any unvented combustion space-heating
appliances.
• Ensure naturally drafted fuel-burning appliances located
in conditioned spaces are installed in compliance with
ASHRAE 62.2-2010 (Section 6.4) or conduct a worst
case depressurization combustion air zone (CAZ) test
according to an established protocol.
• Ensure that all fireplaces and other fuel-burning and
space-heating appliances located in conditioned
spaces are vented to the outdoors and supplied with
adequate combustion and ventilation air according to the
manufacturers' installation instructions.
• Meet the following energy efficiency and emissions
standards and restrictions for all fireplaces and other
fuel-burning and space-heating appliances located in
conditioned spaces:
o Traditional masonry fireplaces designed for open fires
are not permitted, with the exception of "masonry
heaters" as defined by ASTM E1602 and section
2112.1 of the 2012 International Building Code (i.e.,
fireplaces engineered to store and release substantial
portions of heat generated from a rapid burn).
o Factory-built wood-burning fireplaces shall meet the
certification requirements of UL 127 and emission
limits found in the EPA Standard for New Residential
Wood Heaters.
o Natural gas and propane fireplaces shall be
mechanically drafted or direct vented, as defined by
NFPA 54, section 3.3.108, have a permanently affixed
glass front or gasketed door and comply with ANSI
Z21.88/CSA2.33.
o Wood stove and fireplace inserts as defined in
section 3.8 of UL 1482 shall meet the certification
requirements of that standard, and they shall meet the
emission requirements of the EPA Standards for New
Residential Wood Heaters and WAC 173-433-100 (3).
o Pellet stoves shall meet the requirements of ASTM
E1509.
o Decorative gas logs as defined in K.I.11 of NFPA 54
(National Fuel Gas Code) are not permitted.
• Note: Unfinished basements and crawlspaces (except
raised pier foundations with no walls) and attached
garages that are air-sealed to the outside and intended
for use as work or living space, are considered
"conditioned spaces" for the purpose of this requirement.
• Exception: Houses with no combustion heating
equipment located in conditioned spaces.
5.2 Carbon Monoxide Alarms
Indoor airPLUS Requirement:
• All homes equipped with combustion appliance(s) or an
attached garage shall have a carbon monoxide (CO) alarm
installed in a central location in the immediate vicinity of
each separate sleeping zone (e.g., in a hallway adjacent
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to bedrooms.) The alarm(s) shall be hard-wired with a
battery back-up function and placed according to NFPA
720. The alarms shall be certified by either CSA 6.19-01
or UL2034.
5.3 Multi-Family Environmental Tobacco Smoke Protections
Indoor airPLUS Requirements:
• Reduce exposure to environmental tobacco smoke (ETS)
in multi-family buildings by:
o Prohibiting smoking in indoor common areas, specified
explicitly in building rental/lease agreements or condo/
co-op association covenants and restrictions.
o Locating designated outdoor smoking areas a minimum
of 25 ft. from entries, outdoor air intakes and operable
windows.
o Minimizing uncontrolled pathways for ETS transfer
between individual dwelling units by sealing
penetrations in the walls, ceilings and floors of
dwelling units; sealing vertical chases adjacent to
dwelling units; and applying weather stripping to all
doors in dwelling units leading to common hallways.
5.4 Attached Garages
NOTE: Completion of the ENERGY STAR checklists now satisfies
the following Indoor air PLUS requirement:
• Isolate attached garages from conditioned spaces as follows:
o Air-seal common walls and ceilings between attached
garages and living spaces before installing insulation (TES
3 and 5).
o Use weather stripping or equivalent gasket to ensure all
doors between living spaces and attached garages are
substantially air-tight (TES 5.3.1).
Additional Indoor airPLUS Requirements:
• Install an automatic door closer on all connecting doors
between living spaces and attached garages.
• Equip each attached garage with an exhaust fan with a
minimum installed capacity of 70 cfm, installed to vent
directly outdoors. If a ducted fan (not through-the-wall) is
used, test and verify minimum capacity of 70 cfm.
o Wire each exhaust fan for continuous operation OR,
o Install with automatic fan controls (e.g., a motion
detector) that activate the fan whenever the garage is
occupied and operate for at least 10 minutes after the
garage has been vacated.
o Advisories:
1. Exhaust fans wired for continuous operation
are recommended as the preferred option to
ensure removal of contaminants from garages.
If the automatic fan control option is used, EPA
recommends that the exhaust fan operates for 1 hour
after the garage has been vacated.
2. ENERGY STAR certified fans are highly
recommended.
6. Low-Emission Materials
Note: The evaluation, certification and labeling of products
for indoor emissions of volatile organic compounds (VOCs) is
complex and evolving. EPA has not established threshold levels
for indoor VOC emissions from any of the product categories
addressed in these specifications. The third-party programs
referenced in these specifications include U.S. programs that are
designed to reduce human exposure indoors to individual VOCs of
potential concern for human health effects, compared to similar
products not certified as low-VOC or no-VOC. EPA will consider
modifying these specifications to include additional third-party
programs as appropriate.
6.1 Composite Wood
Indoor airPLUS Requirements:
• For structural plywood and oriented strand board (OSB),
use only products certified as compliant with PS1 or
PS2, as appropriate, and made with moisture-resistant
adhesives as indicated by "Exposure 1" or "Exterior" on
the American Plywood Association (APA) trademark.
• Use only hardwood plywood products certified as
compliant with the formaldehyde emissions requirements
of ANSI/HPVA HP-1-2009 and U.S. HUD Title 24, Part
3280, OR certified compliant with CA Title 17.
• Use only particleboard and MDF products certified as
compliant with the formaldehyde emissions requirements
of ANSI A208.1 and A208.2, respectively, and U.S.
HUD Title 24, Part 3280, OR certified compliant with
EPPS CPA 3-08 by the CPA Grademark certification
program, OR certified compliant with CA Title 17.
• Install only cabinetry made with component materials
that are certified to comply with all the appropriate
standards above OR registered brands or products
produced in registered plants certified under KCMA's
Environmental Stewardship Certification Program (ESP
05-12).
• Note: In California, use only composite wood products
certified as compliant with CA Title 17 as appropriate.
Indoor airPLUS Version 1 (Rev. 01) CONSTRUCTION SPECIFICATIONS (February 2C
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6.2 Interior Paints and Finishes
Indoor airPLUS Requirements:
• For interior paints and finishes composing 90 percent
or more of the interior surface area covered by such
products, use only products certified as low-VOC or no-
VOC by one of the following:
o Green Seal Standard GS-11 (Third Edition, August 17,
2011), OR
o Greenguard Certification for Paints and Coatings, OR
o Scientific Certification Systems (SCS) Standard EC-
10.2-2007, Indoor Advantage Gold, OR
o Master Painters Institute (MPI) Green Performance
Standards X-Green, GPS-1 or GPS-2, OR
o A third-party low-emitting product list based on CA
Section 01350 (CDPH Standard Method VI.1-2010),
e.g., the CHPS List at http://www.chps.net/dev/Drupal/
node/445.
6.3 Carpets and Carpet Adhesives
Indoor airPLUS Requirements:
• For carpets and carpet adhesives composing 90 percent
or more of the finished surface area covered by such
products, use only products labeled with, or otherwise
documented as meeting, the Carpet and Rug Institute
(CRI) Green Label Plus testing program criteria.
• For carpet cushion (i.e., padding), use only products
certified to meet the CRI Green Label testing program
criteria.
7. Home Commissioning
7.1 HVAC and Ductwork Verification
NOTE: Completion of the ENERGY STAR checklists now satisfies
the following Indoor airPLUS requirement:
• Verify that HVAC systems and ductwork are installed according
to their design, as documented by a completed and verified
ENERGY STAR HVAC System Ql Contractor Checklist and
ENERGY STAR HVAC System Ql Rater Checklist (HVAC-C and
HVAC-R).
Additional Indoor airPLUS Requirements:
• Inspect ductwork before installing registers, grilles and
diffusers to verify it is dry and substantially free of dust
or debris. If duct openings were not covered during
construction, thoroughly vacuum out each opening prior
to installing registers, grilles and diffusers.
• Inspect air-handling equipment and verify that heat
exchangers/coils are free of dust caused by construction
activities (e.g., drywall, floor sanding) AND the filter
is new, clean and meets specified MERV rating (see
Specification 4.7).
7.2 Ventilation after Material Installation
Indoor airPLUS Requirements:
• Ventilate the home with outside air at the highest rate
practical, meeting ventilation requirements for outdoor
air flow and humidity control (see Specifications 4.5 and
4.8):
o During and shortly after installing products that are
known sources of contaminants (e.g., cabinets, carpet
padding and painting), AND
o During the period between finishing and occupancy.
• Advisory: If whole house ventilation cannot be scheduled
prior to occupancy, advise the buyer to operate the
ventilation system at the highest rate it can provide
during the first few months of occupancy, meeting the
above requirements.
7.3 Buyer Information Kit
Indoor airPLUS Requirements:
• Provide buyers with information and documentation of
the home's IAQ protections, including:
o A copy of the Indoor airPLUS Verification Checklist or
other written documentation indicating compliance
with all required measures from the Indoor airPLUS
Construction Specifications, signed by an official
representative of the builder.
o HVAC, duct and ventilation system design
documentation (i.e., airflow requirements) or
performance test results (i.e., measured cfm) required
by Specifications 4.1, 4.2 and 4.5, respectively, and a
description of the ventilation system (i.e., system type,
components and controls).
o Operations and maintenance instruction manuals for
all installed equipment and systems addressed by
Indoor airPLUS and ENERGY STAR requirements,
including HVAC systems and accessories, combustion
appliances and any radon system.
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Abbreviations
ICC - ES AC International Code Council Evaluation
243 Service Acceptance Criteria 243
CEC California Energy Commission
CFDS Composite Foundation Drainage System
cfm cubic feet per minute
fpm feet per minute
ft. feet
HERS Home Energy Rating System
HVAC heating, ventilating and air-conditioning
IAQ indoor air quality
in. inches
mil common term to describe plastic sheeting
thickness; 1 mil equals 0.001 inches
min. minimum
MDF medium density fiberboard
MERV Minimum Efficiency Reporting Value;
defined in ASHRAE 52.2-2007
OSB oriented strand board
Pa Pascal
pCi/L picocuries per liter
Rev. Revision
sq. ft. square foot
spec specification
VOC Volatile Organic Compound
w.c. water column
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Contractors of America.
AHRI Directory: AHRI Directory of Certified Product Performance.
Air-Conditioning, Heating, and Refrigeration Institute.
ANSI A208.1: ANSI A208.1: Standard Particleboard. 2009.
American National Standards Institute.
ANSI A208.2: ANSI A208.2: Standard for Medium Density
Fiberboard (MDF) for Interior Applications. 2009. American
National Standards Institute.
ANSI/HPVA HP-1-2009: American National Standard for
Hardwood and Decorative Plywood. 2009. American National
Standards Institute / Hardwood Plywood and Veneer Association.
ANSI Z21.88/CSA 2.33: ANSI Standard Z21.88-2009/CSA
Standard 2.33-2009: Vented Gas Fireplace Heaters. 2009.
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Refrigerating, and Air-Conditioning Engineers.
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Air-Conditioning Engineers.
ASHRAE152: ANSI/ASHRAE Standard 152-2004: Method of
Test for Determining the Design and Seasonal Efficiencies of
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ASTM D4442 - 07: ASTM Standard D4442-07: Standard Test
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Wood-Base Materials.
ASTM D7438-08: ASTM Standard D7438-08: Standard Practice
for Field Calibration and Application of Hand-Held Moisture
Meters.
ASTM E1465: ASTM Standard E1465-08a: Standard Practice
for Radon Control Options for the Design and Construction of
New Low-Rise Residential Buildings. 2008. American Society for
Testing and Materials.
ASTM E1509: ASTM Standard El 509-04: Standard
Specification for Room Heaters, Pellet Fuel-Burning Type. 2004.
American Society for Testing and Materials.
ASTM E2600: ASTM Standard E2600-10: Standard Guide for
Vapor Encroachment Screening on Property Involved In Real
Estate Transactions. 2010. American Society for Testing and
Materials.
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-------
ASTM E1554: ASTM Standard El554-07: Standard Test
Methods for Determining External Air Leakage of Air Distribution
Systems by Fan Pressurization. 2007. American Society for
Testing and Materials.
ASTM E1602: ASTM Standard E1602-03(2010)el: Standard
Guide for Construction of Solid Fuel Burning Masonry Heaters.
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ASTM E96-00: ASTM Standard E96-00: Standard Test Methods
for Water Vapor Transmission of Materials.
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CSA 6.19-01: CAN/CSA Standard 6.19-01: Residential Carbon
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Ducts. 2008. Underwriters Laboratories, Inc.
UL 181B: Standard for Closure Systems for Use with Flexible Air
Ducts and Air Connectors. 2008. Underwriters Laboratories, Inc.
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Underwriters Laboratories, Inc.
UL 2034: Standard for Single and Multiple Station Carbon
Monoxide Alarms. 2008. Underwriters Laboratories, Inc.
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433: Solid Fuel Burning Devices, section 100 (3) Emissions
performance standards. 2003.
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United States
Environmental Protection
Agency
Office of Air and Radiation (6609J)
EPA 402/K-13/001 I February 2013
Homes with the Indoor airPLUS label
are designed for improved indoor air quality
compared to homes built to minimum code.
www.epa.gov/indoorairplus
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