&EPA
United States
Environmental Protection
Agency
VERSION 1 (REV. 04)
Indoor airPLUS
CONSTRUCTION SPECIFICATIONS
if-
ENERGY STAR
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El
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February 2018
www.epa.gov/indoorairplus
Indoor Air Quality (IAQ)
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1
About the Indoor airPLUS Construction Specifications 1
What's New in Version 1 (Rev. 04)? 1
Eligibility and Verification Requirements 1
Terms Used in This Document 2
Indoor airPLUS Verification Checklist 3
Guidance for Completing the Indoor airPLUS Verification Checklist 4
Indoor airPLUS Construction Specifications 5
1. Moisture Control 5
2. Radon Control 7
3. Pest Barriers 8
4. HVAC Systems 8
5. Combustion Pollutant Control 10
6. Low Emission Materials 11
7. Home Commissioning 12
Abbreviations 13
References 14
Climate Zones Map 16
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.
The Indoor airPLUS Program fully integrates ENERGY STAR Certified Home requirements as a prerequisite. In addition, both the ENERGY STAR
Certified Home label and the Indoor airPLUS label are prerequisites for the Department of Energy's Zero Energy Ready Home Program and the
PHIUS+ certification by Passive House Institute US, both of which are additional certification options in building high performance, sustainable
homes.
In addition to these Construction Specifications, the Indoor airPLUS Program periodically publishes a Policy Record document. The Policy Record is
used to provide updates on the resolution of issues, including clarifications, refinements, and/or changes to program requirements. Policy Record
updates may be made more frequently than revisions to the Construction Specifications. As such, the Policy Record should be referenced alongside
the Construction Specifications for the most current program requirements and interpretations.
The Construction Specifications, Policy Record, and other program documents can be found at www.epa.gov/indoorairplus/indoor-airplus-
program-documents.
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. 04)?
Indoor airPLUS VI (Rev. 04) revises the Construction Specifications to incorporate Policy Record updates recorded since
the release of Revision 03 in October 2015. Although Indoor airPLUS Revision 4 does not increase program stringency
from previous revisions, it adds clarification and/or refinement to some requirements. Additionally, this revision
updates or eliminates various referenced standards as the industry continues to make improvements on consensus-
based best practices in high performance construction techniques.
Homes permitted starting 05/01/2018 are required to use Revision 4 of the Construction Specifications for qualification.
For homes permitted before 05/01/2018, partners can use either Revision 3 or Revision 4 if desired. The Rater may
define "permit date" as either the date that the permit was issued or the date of the contract on the home.
Eligibility and Verification Requirements
For a home to earn the Indoor airPLUS label, it must also earn the ENERGY STAR Certified Homes label. 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 certified Home Energy Rater, Rating Field Inspector,
or an equivalent designation as determined by a Verification Oversight Organization, such as the Residential Energy
Services Network (RESNET). The home must also comply with all applicable state and local codes and standards.
Instructions for Indoor airPLUS verification are listed below in the Verification Checklist.
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m EPA Indoor
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airPLUS
Qualified homes earn
the Indoor airPLUS
label. Place it next to
the ENERGY STAR
label.
Indoor airPLUS Version 1 (Rev. 04) Construction Specifications (February 2018) 1
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Terms Used in This Document
EXCEPTIONS to the requirements described in these construction specifications are noted as appropriate. For climate exceptions, refer to the
2015 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.
ENERGY STAR Certified Homes- Complete Mandatory Measures Checklists:
Rater-D Rater Design Review Checklist
Rater-F Rater Field Checklist
Builder-W Water Management System Builder Requirements
HVAC-D HVAC Design Report
HVAC-C HVAC Commissioning Checklist
Indoor airPLUS Version 1 (Rev. 04) Construction Specifications (February 2018) 2
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oEPA
United States
Environmental Protection
Agency
Indoor airPLUS Version 1 (Rev. 04)
Verification Checklist
Home Address: City: State: Zip:
Climate Zone (1-6): Radon Zone (1-3):
Section
Requirements (Refer to full Indoor airPLUS Construction Specifications for details)
Must
Correct
Builder
Verified
Rater
Verified
N/A
ENERGY STAR
V3
Note: The Rev. 04 checklist reflects only the additional Indoor airPLUS requirements and their
corresponding section numbers that must be met after completing the ENERGY STAR
requirements. ENERGY STAR remains a prerequisite for Indoor airPLUS qualification.
ENERGY STAR Version 3 (or 3.1, 3.2) Program Requirements must be followed and the home shall
be ENERGY STAR certified in conjunction with Indoor airPLUS qualification.
~
~
Moisture Control
1.1
Drain or sump pump installed in basements and crawlspaces. In EPA Radon Zone 1, check
valve also installed.
~
~
~
~
Exception Applied: ~ Slab-on-grade foundation ~ Free-draining soils
1.2
Layer of aggregate or sand (4 in.) with geotextile matting installed below slabs AND radon
techniques used in EPA Radon Zone 1.
~
~
~
~
Exception Applied: ~ Slab-on-grade foundation ~ Free-draining soils ~ Dry climate
1.4
Basements/crawlspaces insulated, sealed and conditioned.
~
~
~
~
Exception Applied: ~ 100-year flood zone ~ Marine climate ~ Dry climate
~ Crawlspace sealed with capillary break and active dehumidification ~ Raised pier foundation with no walls
1.7
Protection from water splash damage if no gutters.
~
~
~
~
Exception Applied: ~ Rainwater harvesting system ~ Dry climates
1.11
Supply piping in exterior walls insulated with pipe wrap.
~
~
~
~
Exception Applied: ~ Dry climate AND climate zone 1-3 ~ Air barrier insulation in wall cavity
1.14
Hard-surface flooring in kitchens, baths, entry, laundry, and utility rooms.
~
~
~
Radon
2.1
Radon-resistant features installed in Radon Zone 1 homes in accordance with Construction
Specification 2.1.
~
~
~
~
Exception Applied: ~ Perimeter pipe loop in lieu of full aggregate (dry climate) ~ Manufactured home with raised pier foundation
Pests
3.2
Corrosion-proof rodent/bird screens installed at all openings that cannot be fully sealed.
(Not required for clothes dryer vents.)
~
~
~
HVAC Systems
4.1
Equipment selected to keep relative humidity < 60% in "Warm-Humid" climates.
~
~
~
Exception Applied: ~ Climate zones 4-8, 3B, 3C and portions of 3A and 2B
4.2
Duct systems protected from construction debris AND no building cavities used as air
supplies or returns.
~
~
~
4.3
No air-handling equipment or ductwork installed in garage.
~
~
4.6
Clothes dryers vented to the outdoors or plumbed to a drain according to manufacturer's
instructions.
~
~
4.7
Central forced-air HVAC system(s) have minimum MERV 8 filter AND no ozone generators
in home. Temporary filter installed to protect unit from construction dust.
~
~
~
~
Combustion Pollutants
5.1
Emissions standards met for fuel-burning and space-heating appliances.
~
~
~
Identify appliance type:
~ Masonry heater ~ Factory-built wood-burning fireplace ~ Wood stove ~ Pellet stove
~ Natural gas/propane fireplace
Appliance model name/number:
5.2
CO alarms installed in each sleeping zone (e.g., common hallway) according to NFPA 720.
~
~
~
5.3
Multifamily buildings: Smoking restrictions implemented AND ETS transfer pathways
minimized.
~
~
~
~
5.4
Attached garages: Door closer installed on all connecting doors.
~
~
~
Attached garages: In homes with exhaust-only whole-house ventilation EITHER
~ 70 cfm exhaust fan installed in garage OR
~ Pressure test conducted to verify the effectiveness of the garage-to-house air barrier.
~
~
~
Indoor airPLUS Version 1 (Rev. 04) Construction Specifications (February 2018) 3
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Materials
6.1
All composite wood products certified low-emission. See spec.
~
~
~
6.2
Interior paints and finishes certified low-emission. See spec.
~
~
~
6.3
Carpet, carpet adhesives, and carpet cushion certified low-emission. See spec.
~
~
~
~
Final
7.1
HVAC system and ductwork verified to be dry and clean AND new filter installed.
~
~
~
7.2
Home ventilated before occupancy.
~
~
~
7.3
Equipment manuals, Indoor airPLUS label, and certificate provided for owner/occupant.
~
~
~
Rater Company:
Rater Employee:
Rater Signature:
Builder Company:
Builder Employee:
Date:
Builder Signature: Date:
Guidance for Completing the Indoor airPLUS Verification Checklist:
1. 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.
Note: ENERGY STAR footnotes and exceptions will always be utilized unless otherwise noted in the Indoor airPLUS Construction Specifications.
In some cases, Indoor airPLUS modifies or excludes certain ENERGY STAR exceptions or alternate pathways.
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 also 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 Rater shall retain the rating documentation, all required ENERGY STAR Certified Homes documentation, and the Indoor airPLUS
Verification Checklist for the home for a minimum of 2 years from final verification. The Rater shall coordinate with the Provider and/or
builder to provide an Indoor airPLUS label and certificate for each qualified 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 or unit within a multifamily building. 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.
However, the builder may provide the Rater with a single signed copy of the checklist for an entire building or group of units with builder-
verified items under the condition that all units within the building or group utilize: 1) the same HVAC system type (i.e. ductless mini-split,
forced air, hydronic); 2) the same combustion appliances and combustion pollutant controls; and 3) the same low-emission materials
certification/standard for all products (within their respective categories) verified in Section 6 of the Indoor airPLUS Construction
Specifications. If there are no builder-verified items, the Rater may also utilize one checklist per group of units if the above criteria are met.
Groups of units with any of the following conditions will require a separate and unique checklist to be completed and signed by the Rater and
builder:
• Any units with differing HVAC system type (i.e., ductless mini-split, forced air, hydronic);
• Any units with differing combustion appliance types (e.g., masonry heater, pellet stove, wood-burning fireplace) stove, factory-built, etc.)
or combustion pollutant controls; or Any units/groups with low-emission materials or finishes addressed in Section 6 that are compliant
based on different certifications/standards within their product category.
• Exception: Builders and Raters may use a single checklist for units utilizing low-emission materials certified to different labels or
standards, provided that documentation of the certifications for those materials are retained by the builder and available for inspection
upon request.
For further information on the Indoor airPLUS
program, visit www, eoa. go v/indoorairplus.
"a\1 AH Indoor airPLUS qualified homes meet strict
ENERGY STAR
guidelines for energy efficiency set by ENERGY STAR,
the nationally-recognized symbol for energy efficiency.
Indoor airPLUS Version 1 (Rev. 04) Construction Specifications (February 2018) 4
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Indoor airPLUS Construction Specifications
Version 1 (Rev. 04)
ENERGY STAR certification is a pre-requisite for a home to achieve Indoor airPLUS qualification. ENERGY STAR checklist items that satisfy Indoor
airPLUS requirements are only summarized below. Please refer to the ENERGY STAR National Program Requirements and the checklists under
Complete Mandatory Measures for more information and the full description of the requirement. Depending on your state, newer versions of the
ENERGY STAR Program Requirements may be in effect (e.g. V3.1, V3.2). States under newer versions of the ENERGY STAR Program Requirements
can be found listed with other individual Regional Specifications.
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1. Moisture Control
1.1 Site and Foundation Drainage
NOTE: Completion of the ENERGY STAR requirements satisfies the
following Indoor airPLUS requirements:
¦S Slope patio slabs, walks and driveway; tamp back-fill to prevent
settling; AND slope the final grade away from the foundation (Builder-
W 1.1 and 1.2).
¦S 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. (Builder- W 1.1 and 1.2).
¦S 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) (Builder-W 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:
¦ Slab-on-grade foundations.
¦ In areas of free-draining soils — identified as Group 1
(Table R405.1, 2015 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 backwater valve (check valve) at the drain tile outfall (see
Specification 2.1 for additional radon measures).
1.2 Capillary Break Installation
NOTE: Completion of the ENERGY STAR requirements satisfies the
following Indoor airPLUS requirements:
¦S 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 (Builder-W 1.3).
¦S Install a capillary break at all crawlspace floors using > 6 mil
polyethylene sheeting, lapped 6 to 12 in. (Builder-W 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.
Exceptions to the aggregate OR sand requirement:
(Not applicable in EPA Radon Zone 1)
¦ Dry climates, as defined by 2015 IECC Figure 301.1.
¦ Areas with free-draining soils - identified as Group 1 (Table
R405.1, 2015 IRC) by a certified hydrologist, soil scientist, or
engineer through a site visit.
¦ Slab-on-grade foundations.
Alternative path for gut-rehabs:
¦ For an existing slab in a home undergoing a gut
rehabilitation in Radon Zones 2 and 3, the alternate slab
treatment in the ENERGY STAR Water Management System
Builder Checklist, footnote 5, shall apply as an alternative to
polyethylene and aggregate or sand under the slab. Homes
undergoing gut rehabilitation in Radon Zone 1 must also
install an active radon system utilizing sub-slab
depressurization, and radon levels shall be verified upon
final inspection to be below the EPA action level (4pCi/l) to
receive qualification.
Note: In EPA Radon Zone 1 (see Specification 2.1):
¦ Polyethylene sheeting must be installed and overlapped by 6
to 12 in. at the seams.
¦ ENERGY STAR staking method for poly sheeting may not be
used in crawlspaces with no slab.
¦ ENERGY STAR exceptions for capillary break (polyethylene)
under slabs do not apply. Poly is required in Radon Zone 1.
Advisory: 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 requirements satisfies the
following Indoor airPLUS requirements:
¦S Finish all masonry and concrete walls (e.g., poured concrete, concrete
masonry, insulated concrete forms) with a damp-proof coating
(Builder-W 1.5).
¦S Finish all wood-framed walls with polyethylene and adhesive or other
equivalent waterproofing (Builder-W 1.5).
No additional Indoor airPLUS Requirements
Indoor airPLUS Version 1 (Rev. 04) Construction Specifications (February 2018) 5
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1.4 Basement and Crawlspace Insulation and Conditioned Air
Indoor airPLUS Requirements:
• Seal crawlspace and basement perimeter walls to prevent
outside air infiltration.
• Insulate crawlspace and basement perimeter walls according
to the prescriptive values determined by local code or R-5,
whichever is greater.
• Provide conditioned air at a rate not less than 1 cfm per 50 sq.
ft. of horizontal floor area. This can be achieved by a dedicated
supply (2015 IRC section R408.3.2.2) or through crawl-space
exhaust (2015 IRC section R408.3.2.1). However, if radon-
resistant features are required (see Specification 2.1), do not
use the crawlspace exhaust method.
Exceptions:
¦ Homes built in areas designated as 100-year flood zones.
(Conditioned crawlspaces are not recommended for use in
flood zones. For more information on designated 100-year
flood zones, see FEMA's definition of Special Flood Hazard
Areas: https://www.fema.eov/flood-zones).
¦ Raised pier foundations with no walls.
¦ Dry climates, as defined by 2015 IECC Figure 301.1.
¦ Marine climates, as defined by 2015 IECC Figure 301.1, if no
air handler or return ducts are installed in the crawlspace.
Additional Exceptions:
¦ In lieu of perimeter wall insulation and conditioned air,
crawlspaces that utilize a capillary break on the floor and
that are well-sealed to prevent outside air infiltration are
permitted to utilize active dehumidification with sufficient
latent capacity to maintain relative humidity (RH) at or
below 60 percent. The dehumidifier shall be drained to the
outside or to a sump pump. With this exception, ENERGY
STAR Certified Homes Water Management System Builder
Requirements Item 1.4.3 staking method for poly sheeting
may not be used in crawlspaces with no slab.
1.5 Drainage Plane and Drainage System
NOTE: Completion of the ENERGY STAR requirements satisfies the
following Indoor airPLUS requirements:
¦S Install a continuous drainage plane behind exterior wall cladding that
overlaps flashing and is fully sealed at all penetrations (Builder-W
2.2).
¦S Install flashing or an equivalent drainage system at the bottom of
exterior walls to direct water away from the drainage plane and
foundation (Builder-W2.1).
No additional Indoor airPLUS Requirements
1.6 Window and Door Openings
NOTE: Completion of the ENERGY STAR requirements satisfies the
following Indoor airPLUS requirement:
¦S 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 (Builder-W 2.3).
No additional Indoor airPLUS Requirements
1.7 Gutters, Downspouts and Site Drainage
NOTE: Completion of the ENERGY STAR requirements satisfies the
following Indoor airPLUS requirements:
¦S Direct roof water away from the house using gutters and downspouts
that empty into lateral piping on a sloping finish grade (Builder-W
3.2); OR
¦S Direct roof water to an underground catchment system not connected
to the foundation drain system that discharges water > 10 ft. from
foundation (Builder-W3.2).
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 at eaves that is horizontally 16 in. away
from the edge of the foundation wall; OR
o Use cladding materials that are decay and rot resistant
and can tolerate regular wetting extending at least 16 in.
above final grade and install a well-sealed, continuous
drainage plane per manufacturer's instructions.
Advisory: The use of self-adhering moisture membranes
directly on exterior sheathing should be limited in these
applications to encourage drying potential of moisture
vapor through the wall assembly. A moisture resistant,
non-perforated, and vapor permeable housewrap is
preferred. (However, this may not be true for all wall
assemblies where 50% or more of the insulation is
outboard the structural assembly.)
Exceptions:
¦ Dry climates, as defined by 2015 IECC Figure 301.1.
¦ Homes with rainwater harvesting systems that are designed
to properly drain overflow, meeting discharge-distance
requirements outlined in ENERGY STAR Builder-W Item
number 3.2.
1.8 Roof to Wall Intersections and Roof Penetrations
NOTE: Completion of the ENERGY STAR requirements satisfies the
following Indoor airPLUS requirements:
¦S 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 (Builder-W 3.1).
¦S Install "kick-out" flashing at the low end of roof-to-wall intersections
(Builder-W 3.1).
No additional Indoor airPLUS Requirements
1.9 Roof Valleys and Decking
NOTE: Completion of the ENERGY STAR requirements satisfies the
following Indoor airPLUS requirement:
¦S Install a self-sealing bituminous membrane or the equivalent at all
valleys and roof decking penetrations for durability at potential
failure points (Builder-W 3.3).
No additional Indoor airPLUS Requirements
Indoor airPLUS Version 1 (Rev. 04) Construction Specifications (February 2018) 6
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1.10 Roof Eaves
NOTE: Completion of the ENERGY STAR requirements satisfies the
following Indoor airPLUS requirement:
¦S Install ice flashing over the sheathing at eaves to provide protection
from ice dams in climate zones 5 and higher (Builder-W 3.4).
¦S 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 (Builder-W 3.4).
No additional Indoor airPLUS Requirements
1.11 Moisture-Protective Systems
NOTE: Completion of the ENERGY STAR requirements satisfies the
following Indoor airPLUS requirements:
¦S Install moisture-resistant backing material behind tub and shower
enclosures (Builder-W4.2).
¦S Install a corrosion-resistant drain pan properly draining to a
conspicuous point of disposal (Builder-W 4.6).
Additional Indoor airPLUS Requirements:
• Insulate water supply pipes in exterior walls with pipe wrap.
Exceptions:
¦ Climate zones 1-3 located in dry climates, as defined by 2015
IECC Figure 301.1.
¦ When insulation in the wall cavity qualifies as an air barrier
and pipes are located within the interior 50% of the wall
cavity.
Advisory: Pipes should be installed as close as possible to
conditioned space while maintaining Grade 1 insulation
installation to reduce risk of freezing and/or condensation.
1.12 Class 1 Vapor Retarders
NOTE: Completion of the ENERGY STAR requirements satisfies the
following Indoor airPLUS requirement:
¦S 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 (Builder-W 1.6 and4.3). Footnote:
Class 1 vapor retarders, such as mirrors, may be used if mounted with
clips or other spacers that allow air to circulate behind them.
No additional Indoor airPLUS Requirements
1.13 Materials with Signs of Water Damage or Mold
NOTE: Completion of the ENERGY STAR requirements satisfies the
following Indoor airPLUS requirements:
¦S 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 afterdamp
wipe are acceptable. Lumber with "sap stain fungi" is exempt from
this Item as long the lumber is structurally intact. (Builder-W4.4).
¦S Do not enclose (e.g., with drywall) framing members and insulation
products having high moisture content. (Note: Lumber should not
exceed 18 percent moisture) (Builder-W4.5).
¦S For wet-applied insulation, follow the manufacturer's drying
recommendations (Builder- W4.5).
No additional Indoor airPLUS Requirements
1.14 Moisture-Resistant Materials
Indoor airPLUS Requirements:
• Install only water-resistant hard-surface flooring in kitchens,
bathrooms, entryways, laundry areas and utility rooms.
Note: Wood flooring, either pre-finished or site-finished, can be
utilized in these areas, as long as any composite wood material or
site-applied finish comply with Items 6.1 and 6.2, respectively.
2. Radon
2.1 Radon-Resistant Construction
NOTE: Completion of the ENERGY STAR requirements satisfies the
following Indoor airPLUS requirement:
¦S Air seal all sump covers (Builder-W 1.7).
Additional Indoor airPLUS Requirements:
• Construct homes in EPA Radon Zone 1 (see
www.epa.gov/radon/zonemap.html) with radon-resistant
features (a passive system at minimum). EPA recommends that
radon-resistant features are installed according to ANSI/AARST
CCAH for 1-2 family dwellings and townhouses (max. total
foundation area of 2500 sq. ft.) OR ANSI/AARST CC-1000 for
larger foundations.
Visually verify the following requirements:
o Capillary break installed according to Specification 1.2,
irrespective of climate zone.
Exception: In dry climates as defined by 2015 IECC Figure
301.1, a "pipe loop" in a trench of clean aggregate along
the entire inside perimeter of the foundation (installed
according to ANSI/AARST CCAH 403.1.1) can be used in lieu
of a uniform layer of aggregate under the entire slab.
o A 3 or 4 in. diameter gas-tight vertical vent pipe, clearly
labeled as a component of a radon reduction 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. At least 10 ft. of horizontal
perforated drain tile is to be attached to the T-fitting
beneath the polyethylene sheeting placed over earthen
crawlspaces and below concrete slabs. Note: suction
points are not permitted on sump lids.
o Radon fan (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. A space surrounding the radon
pipe, having a vertical height of not less than 48 inches
and a diameter of not less than 21 inches, shall be
provided in the attic area where the radon fan can be
installed, if required.
o Homes with no accessible attic location for a fan must
utilize another exterior location or a garage that is not
below conditioned space per ANSI/AARST CCAH. The
branch circuit supply shall be labeled at the electrical
panel indicating its intended use.
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. 04) Construction Specifications (February 2018) 7
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Exception to Item 2.1: Manufactured homes with raised-pier
foundations (i.e. no solid perimeter foundation wall).
Alternative path for gut-rehabs:
¦ For homes with an existing slab undergoing gut
rehabilitation in Radon Zone 1, an active radon system
utilizing sub-slab depressurization must be installed, and
radon levels shall be verified upon final inspection to be
below the EPA action level (4pCi/l) to receive qualification.
The alternate slab treatment in the ENERGY STAR Water
Management System Builder Checklist, footnote 5, shall
apply as an alternative to polyethylene and aggregate or
sand under the slab.
Note: Larger buildings and multifamily properties may share
mitigation systems across multiple units or may require multiple
soil gas vent systems to accommodate large building footprints.
See ANSI/AARST CC-1000 for electric metering requirements in
shared (collateral) mitigation systems, as well as for maximum
nominal sizes of soil gas collection plenums and corresponding
pipe sizes.
Note: Consult local building codes to determine whether
additional radon requirements apply. Also consult EPA's "Building
Radon Out" (EPA 402-K-01-002) for general guidance on installing
radon-resistant features.
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 www.epa.eov/radon/wherevoulive.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 include a
radon vent fan. EPA also recommends radon-resistant
features for homes built in EPA Radon Zones 2 and 3, and
that all homes with or without 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. Provide buyers with EPA's Citizen's Guide to Radon,
encourage them to test for radon and refer them to
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 requirements satisfies the
following Indoor airPLUS requirements:
¦S Seal all penetrations and joints between the foundation and exterior
wall assemblies (Rater-F 4.1 and4.3).
¦S Air seal all sump covers (Builder-W 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 2015 IRC Figure R301.2 [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
2015 IRC Figure R301.2[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.
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.
Indoor airPLUS Version 1 (Rev. 04) Construction Specifications (February 2018) 8
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4. HVAC Systems
4.1 HVAC Sizing and Design
NOTE: Completion of the ENERGY STAR requirements satisfies the
following Indoor airPLUS requirements:
¦S Calculate room-by-room heating and cooling design loads using
Unabridged ACCA Manual J, 2013 ASHRAE Fundamentals, or other
methodology per the Authority Having Jurisdiction (HVAC-D 3).
¦S Select all heating and cooling equipment to accommodate the
calculated heating and cooling design loads using ACCA Manual S and
ENERGY STAR allowances, inclusive of the pressure drop from all
specified filters (HVAC-D 4).
Additional Indoor airPLUS Requirements:
• In "Warm-Humid" climates as defined by Section 301 of the
2015 IECC (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 2015 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 2015 IECC Figure
301.1.
4.2 Duct System Design and Installation
NOTE: Completion of the ENERGY STAR requirements satisfies the
following Indoor airPLUS requirements:
•S Design all duct systems according to ACCA Manual D (HVAC-D 5).
¦S Ensure that all duct systems are installed to be substantially airtight
(Rater-F 6.4 and 6.2).
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 should 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.
4.4 Room Pressure Differentials
NOTE: Completion of the ENERGY STAR requirements satisfies the
following Indoor airPLUS requirement:
¦S Minimize room pressure differentials for any bedroom (as defined by
RESNET's Mortgage Industry National Home Energy Rating Systems
Standards (the RESNETStandard) that does not have a dedicated
return (Rater-F 6.2).
No additional Indoor airPLUS Requirements
4.5 Mechanical Whole-Dwelling Ventilation
NOTE: Completion of the ENERGY STAR requirements satisfies the
following Indoor airPLUS requirements:
¦S Provide mechanical whole-dwelling ventilation meeting all
requirements of ASHRAE 62.2-2010 or later (HVAC-D 2).
•S Test airflows to ensure they meet ASHRAE 62.2-2010 or later
minimum requirements (Rater-F 7.1).
¦S Visually verify the following requirements:
o Transfer air is not used to meet ventilation requirements (Rater-F
7.7.1).
o Outdoor air inlets are located a minimum of 10 ft. from
contaminant sources (Rater-F 7.7.2).
No additional Indoor airPLUS Requirements
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). EPA also
recommends filtering air inlets with a filter rated at MERV 13 or
higher to minimize outdoor particles entering the home.
4.6 Local Exhaust for Known Pollutant Sources
NOTE: Completion of the ENERGY STAR requirements satisfies the
following Indoor airPLUS requirements:
¦S Provide local mechanical exhaust ventilation to the outdoors in each
bathroom and kitchen, meeting ASHRAE 62.2-2010 Section 5
requirements (Rater-F 8.1 and 8.2).
Additional Indoor airPLUS Requirements:
• Conventional clothes dryers shall be vented to the outdoors.
Electric condensing dryers shall be plumbed to a drain
according to manufacturer's instructions.
4.7 Filtration for Central Forced-Air HVAC Systems
NOTE: Completion of the ENERGY STAR requirements satisfies the
following Indoor airPLUS requirement:
¦S 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
(Rater-F 9.3).
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).
Advisory: EPA recommends, but does not require, filters rated
at MERV 13 or higher to reduce exposure to fine particles.
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.
Indoor airPLUS Version 1 (Rev. 04) Construction Specifications (February 2018) 9
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• Upon installation of the air handling unit, include a filter for
the remainder of construction activity to protect the unit
and/or coil from construction debris and dust. Filter should be
clean upon final inspection following construction (see
Specification 7.1).
Advisory: To reduce the likelihood of construction dust
contaminating the ducts and air handler, limit use of the HVAC
system during activities with increased dust (e.g. drywall
sanding, floor sanding).
• 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 requirements satisfies the
following Indoor airPLUS requirements:
¦S Mechanically draft or direct vent all gas- and oil-fired furnaces, boilers
and water heaters located in conditioned spaces. Naturally drafted
equipment is allowed in Climate Zones 1-3 if the Rater has followed
the combustion safety test procedures in Section 805 of the RESNET
Standard. (Rater-F 10.1).
¦S Fireplaces that are not mechanically drafted or direct-vented to the
outdoors must meet maximum allowed exhaust flow (Rater-F 10.2).
Additional Indoor airPLUS Requirements:
• Do not install any unvented combustion space-heating or
decorative appliances within conditioned space.
• 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 shall have tight-
fitting, gasketed glass doors and a dedicated outside air
supply.
Advisory: Factory-built wood burning fireplaces qualified
under EPA's wood-burning fireplace program are
recommended. See:
www.epa.gov/burnwise/fireplacelist.html
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's New Source Performance
Standards for new residential wood heaters. See:
www.epa.gov/residential-wood-heaters/final-new-
source-performance-standards-residential-wood-heaters.
o Pellet stoves shall meet the requirements of ASTM E1509
AND they shall meet the emission requirements of the
EPA New Source Performance Standards for new
residential wood heaters.
o Natural gas and propane fireplaces shall have a
permanently affixed glass front or gasketed door, and be
power vented or direct vented in accordance with ANSI
Z21.88/CSA 2.33. Decorative gas logs as defined in ANSI
Z21.84/CSA 2.33 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.
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 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 UL 2034.
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.
Advisory: To ensure that air sealing will effectively prevent
migration of ETS, other air pollutants and odors between units in
multifamily structures, conduct air-tightness testing of each unit
in accordance with Section 802 of the RESNET Standard. The
maximum air leakage rate should not exceed 0.3 CFM per square
foot of the dwelling unit's enclosure area, at an induced pressure
difference of 50 Pa, where the enclosure area includes the floor
area, the ceiling area, and the demising and exterior wall areas.
5.4 Attached Garages
NOTE: Completion of the ENERGY STAR requirements satisfies the
following Indoor airPLUS requirement:
¦S Isolate attached garages from conditioned spaces as follows:
o Air-seal common walls and ceilings between attached garages and
living spaces before installing insulation (Rater-F 2.4, 2.6, and 4.7).
Indoor airPLUS Version 1 (Rev. 04) Construction Specifications (February 2018) 10
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o Use weather stripping or equivalent gasket to ensure all doors
between living spaces and attached garages are substantially air-
tight (Rater-F 4.9).
Additional Indoor airPLUS Requirements:
• Install an automatic door closer on all connecting doors
between living spaces and attached garages, AND
• In homes with exhaust-only whole house ventilation meet one
of the following two requirements:
o Equip the attached garage with an exhaust fan with a
minimum installed capacity of 70 cfm that is vented
directly outdoors. The fan shall be wired for continuous
operation or with automatic fan controls (e.g., a motion
detector) that activate the fan whenever the garage is
occupied and operate for at least 1 hour after the garage
has been vacated. If a ducted fan (not through-the-wall) is
used, test and verify minimum capacity of 70 cfm, OR
o Verify that the garage-to-house air barrier can maintain a
pressure difference of greater than 45 Pa while the home
maintains a 50 Pascal pressure difference with respect to
the outdoors. All operable garage openings shall be closed
during this test.
Advisories:
1. EPA recommends installing a garage exhaust fan if the
homebuyer is expected to occupy the garage for work or
recreational activities over extended periods of time.
2. ENERGY STAR certified fans are highly recommended.
3. Provide occupants with information in the Buyer Information
Kit on the importance of, and methods for, ensuring adequate
ventilation in the garage while occupied for extended periods
of time.
6. Low-Emission Materials
Download How to Find Indoor airPLUS Compliant Low Emission
Products, which provides guidance on identifying compliant
products including industry databases and examples of product
labeling.
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
NOTE: The following requirements pertain to ALL composite wood
products installed in the home during construction. Examples include but
are not limited to: structural panels, cabinetry, shelving, trim, doors, stair
treads, flooring, etc. See exceptions.
Indoor airPLUS Requirements:
• Structural plywood and oriented strand board (OSB): Use only
products certified compliant with:
o 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.
• Hardwood plywood: Use only products certified compliant
with:
o Formaldehyde emissions requirements of ANSI/HPVA HP-
1-2016; OR
o California Air Resources Board (CARB) Airborne Toxics
Control Measure (ATCM) Phase II to Reduce
Formaldehyde Emissions from Composite Wood Products;
OR
o EPA Toxic Substances Control Act (TSCA) Title VI certified.
• Particleboard and MDF products: Use only products certified
compliant with:
o CARB ATCM Phase II to Reduce Formaldehyde Emissions
from Composite Wood Products; OR
o EPA Toxic Substances Control Act (TSCA) Title VI certified;
OR
o Formaldehyde emissions requirements of ANSI A208.1
(particleboard) and A208.2 (MDF); OR
o ECC Sustainability Standard by the Composite Panel
Association; OR
o GREENGUARD orGREENGUARD GOLD Certification.
• Cabinetry: Made with component materials (plywood,
particleboard, MDF) that are certified to comply with:
o The appropriate standards above; OR
o Registered brands or products produced in plants certified
under the Kitchen Cabinet Manufacturers Association's
(KCMA) Environmental Stewardship Certification Program
(ESP 05-12); OR
o GREENGUARD or GREENGUARD GOLD Certification for
Cabinetry.
Exceptions to Item 6.1 per the CA ATCM and EPA's TSCA Title VI:
¦ Windows that contain composite wood products are exempt
from the requirements of this section if the window product
contains less than five percent by volume of HWPW, PB, or
MDF combined in relation to the total volume of the finished
window product.
¦ Exterior doors and garage doors that contain composite
wood products are exempt from the requirements of this
section if either: (A) the doors are made from composite
wood products manufactured with no added formaldehyde
based resins or ULEF resins; or (B) the doors contain less
than three percent by volume of HWPW, PB, or MDF
combined in relation to the total volume of the finished
exterior door or garage door.
Note: "No added formaldehyde" (NAF) or "Ultra-low emitting
formaldehyde" (ULEF) products that are specifically
manufactured under a limited exemption from the CARB ATCM
to Reduce Formaldehyde Emissions from Composite Wood
Products or EPA's TSCA Title VI rule are compliant with Indoor
airPLUS.
Indoor airPLUS Version 1 (Rev. 04) Construction Specifications (February 2018) 11
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6.2 Interior Paints and Finishes
Indoor airPLUS Requirements:
• At least 90 percent of the interior surface area covered by site-
applied paints and coatings shall use low-VOC or no-VOC
products certified by one of the following third-party standards
or certifications:
o GREENGUARD or GREENGUARD GOLD Certification for
Paints and Coatings, OR
o Scientific Certification Systems (SCS) Standard EC-10.3-
2014, Indoor Advantage Gold, OR
o A third-party low-emitting product list based on CA
Section 01350 (CDPH Standard Method VI.2-2017), OR
o Green Seal Standard GS-11, OR
o Green Wise and Green Wise Gold products, OR
o Master Painters Institute (MPI) Green Performance
Standards X-Green, GPS-1 or GPS-2.
6.3 Carpets and Carpet Adhesives
Indoor airPLUS Requirements:
• At least 90 percent of the interior surface area covered by
carpet and carpet adhesives must use 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 Plus testing program criteria.
6.4 Adhesives and Sealants
Advisory: While not currently required by Indoor airPLUS, EPA
recommends that at least 90 percent of site-applied interior
adhesives and sealants be low-VOC or no-VOC products certified
by one of the following third-party standards or certifications:
• A third-party low-emitting product list based on CA
Section 01350 (CDPH Standard Method VI.2-2010), OR
• Green Seal GS-36, OR
• GREENGUARD or GREENGUARD GOLD certification for
adhesives and sealants.
6.5 Hard Surface Flooring
Advisory: While not currently required by Indoor airPLUS, EPA
recommends that at least 90 percent of the interior hard surface
flooring materials, adhesives, and underlayments be low-VOC or
no-VOC emitting as certified by one of the following third-party
standards or certifications:
• FloorScore ®; OR
• GREENGUARD or GREENGUARD Gold; OR
• SCS Indoor Advantage Gold; OR
• A third party low-emitting product list based on CA
Section 01350 (CDPH Standard Method vl.2-2017); OR
• CRI Green Label Plus (adhesives)
7. Home Commissioning
7.1 HVAC and Ductwork Verification
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.
• After all dust-producing construction activities are complete
(e.g., drywall, trim carpentry, floor sanding), verify HVAC filters
are new, clean, and meet specified MERV rating (see
Specification 4.7).
Advisory: Air balancing of supply registers and return grilles is
highly recommended to improve the performance of the HVAC
system and comfort of the occupants, but is not required at this
time for Indoor airPLUS qualification.
7.2 Ventilation after Material Installation
Indoor airPLUS Requirements:
• Ventilate the home with outside air at the highest rate and
duration practical, meeting ventilation requirements for
outdoor air flow and humidity control (see Item 4.5):
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 Owner and Resident Information Kit
Indoor airPLUS Requirements:
• Provide resident(s), property manager, and/or building owner
with information and documentation of the home's IAQ
protections, including:
o An Indoor airPLUS label and certificate.
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, dehumidifiers, combustion
appliances and any radon system.
Advisory: Provide the homebuyer with information that
addresses the importance of ensuring that manually controlled
ventilation options (e.g., bathroom, garage (if applicable), kitchen
exhaust fans; operable windows, and doors, etc.) are used when
strong pollutant sources are present, such as when using
common household products (e.g., cleaning products, pesticides)
and when using the garage for hobbies or other pollutant
generating activities.
Indoor airPLUS Version 1 (Rev. 04) Construction Specifications (February 2018) 12
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Abbreviations
CFDS
Composite Foundation Drainage System
cfm
cubic feet per minute
ETS
Environmental Tobacco Smoke
fpm
feet per minute
ft.
feet
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
Indoor airPLUS Version
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
1 (Rev. 04) Construction Specifications (February 2018) 13
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References
ACCA Man D: ACCA Manual D: Residential Duct Systems. 2015. Air
Conditioning Contractors of America.
ACCA Man J: ACCA Manual J: Residential Load Calculation - 8th Ed.
2015. Air Conditioning Contractors of America.
ANSI A208.1: ANSI A208.1: Standard Particleboard. 2016. American
National Standards Institute.
ANSI A208.2: ANSI A208.2: Standard for Medium Density
Fiberboard (MDF) for Interior Applications. 2016. American National
Standards Institute.
ANSI/AARST CCAH 2012: ANSI/AARST Standard: Reducing Radon in
New Construction of 1 & 2 Family Dwellings and Townhouses. 2012.
American Association of Radon Scientists and Technologists.
ANSI/AARST CC-1000 2017: ANSI/AARST Standard: Soil Gas Control
Systems In New Construction of Buildings. 2017. American National
Standards Institute / American Association of Radon Scientists and
Technologists. ANSI/HPVA HP-1-2016: American National Standard
for Hardwood and Decorative Plywood. 2015. American National
Standards Institute / Hardwood Plywood and Veneer Association.
ANSI Z21.88/CSA 2.33: ANSI Standard Z21.88-2014/CSA Standard
2.33-2014: Vented Gas Fireplace Heaters. 2014. American National
Standards Institute/Canadian Standards Association.
APA: American Plywood Association provides a voluntary product
standard for structural plywood and oriented strand board (OSB).
http://www.apawood.org/plvwood.
ASHRAE Handbooks: ASHRAE Handbook Series. American Society of
Heating, Refrigerating, and Air-Conditioning Engineers.
ASHRAE 52.2: ANSI/ASHRAE Standard 52.2-2007: Method of Testing
General Ventilation Air-Cleaning Devices for Removal Efficiency by
Particle Size. 2007. American Society of Heating, Refrigerating, and
Air-Conditioning Engineers.
ASHRAE 62.2: ANSI/ASHRAE Standard 62.2-2010: Ventilation and
Acceptable Indoor Air Quality in Low-Rise Residential Buildings.
2010. American Society of Heating, Refrigerating, and Air-
Conditioning Engineers.
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 E1509-04: 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.
ASTM E1602: ASTM Standard E1602-03(2010) el: Standard Guide
for Construction of Solid Fuel Burning Masonry Heaters. 2010.
American Society for Testing and Materials.
CA Section 01350: CDPH Standard Method VI.2-2017; California
Section 01350: Special Environmental Requirements Specification:
Standard Method for the Testing and Evaluation of Volatile Organic
Chemical Emissions from Indoor Environmental Chambers. 2017.
State of California.
https://archive.cdph.ca.eov/proerams/IAQ/Documents/CDPH-
IAQ StandardMethod VI 2 2017.pdf.
California Air Resources Board (CARB) Airborne Toxics Control
Measure (ATCM) Phase II to Reduce Formaldehyde Emissions from
Composite Wood Products. CA Title 17, Section 93120.
www.arb.ca.eov/toxics/compwood/compwood.htm.
Comprehensive Environmental Response, Compensation, and
Liability Act (CERCLA): Known asSuperfund, authorizes EPA to
respond to releases, or threatened releases of hazardous
substances that may endanger public health, welfare, or the
environment.
CRI Green Label: Carpet and Rug Institute Green Label Testing
Programs.
CRI Green Label Plus: Carpet and Rug Institute Green Label Plus
Testing Programs. http://www.carpet-rue.ore/CRI-Testine-
Proerams/Green-Label-Plus/Carpet.-Adhesive-Cushion.aspx.
CSA 6.19-01: CAN/CSA Standard 6.19-01: Residential Carbon
Monoxide Alarming Devices. 2006. Canadian Standards Association.
Eco-Certified Composite (ECC) Sustainability Standard (CPA 4-11):
Composite Panel Association. 2012.
ENERGY STAR Certified Homes Version 3 Checklists: U.S.
Environmental Protection Agency.
http://www.enerevstar.eov/index.cfm?c=bldrs lenders raters.nh v
3 euidelines.
EPA Building Radon Out (EPA402-K-01-002): Building Radon Out: A
Step-by-Step Guide On How to Build Radon-Resistant Homes. 2001.
U.S. Environmental Protection Agency.
EPA How to Find Indoor airPLUS Compliant Low Emission Products
provides guidance on identifying compliant products.
http://www.epa.eov/indoorairplus/indoor-airplus-compliant-low-
emission-products.
EPA Radon Maps: EPA's Map of Radon Zones. 2008. U.S.
Environmental Protection Agency.
EPA's New Source Performance Standard: Clean air standards for
residential wood heaters. 2015. U.S. Environmental Protection
Agency.
EPA Vapor Intrusion Primer: Brownfields Technology Primer: Vapor
Intrusion Considerations for Redevelopment. 2008. U.S.
Environmental Protection Agency.
FloorScore ®: FloorScore® certification standard for hard surface
flooring materials, adhesives, and underlayments. 2014. Scientific
Certification Systems.
https://www.scselobalservices.com/floorscore.
Formaldehyde Emission Standards for Composite Wood Products:
Toxic Substances Control Act Title VI Formaldehyde Emission
Standards for Composite Wood Products. 2016. 40 Code of Federal
Regulations, Part 770.
https://www.reeulations.eov/document?D=EPA-HQ-OPPT-2Q16-
0461-0001.
GREENGUARD and GREENGUARD Gold Certification: GREENGUARD
Certification Program for Low Emitting Products: Paints and
Coatings. 2015. GREENGUARD Environmental Institute.
http://ereeneuard.ore/en/certificationproerams.aspx.
Indoor airPLUS Version 1 (Rev. 04) Construction Specifications (February 2018) 14
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Green Seal Standard GS-11: GS-11: Green Seal Environmental
Standard for Paints and Coatings 3rd Ed. 2011. Green Seal, Inc.
http://www.ereenseal.ore/portals/Q/documents/standards/es-
11/es-ll paints and coatings standard.pdf.
Green Wise and Green Wise Gold Standard: Certified by Coatings
Research Group Incorporated. 2010.
http://greenwisepaint.com/performance-standards.
HPVA: Hardwood Plywood & Veneer Association. ANSI/HPVA HP-1
2015 standard for hardwood and decorative plywood and the
ANSI/HPVA EF 2015 standard for engineered wood flooring.
http://www.hpva.org/hpva-national-consensus-standards.
IBC: International Building Code. 2012. International Code Council,
Inc.
IECC: International Energy Conservation Code. 2015. International
Code Council, Inc.
IRC: International Residential Code for One- and Two-Family
Dwellings. 2015. International Code Council, Inc.
KCMA ESP 05-12: Environmental Stewardship Program. 2012.
Kitchen Cabinet Manufacturer's Association.
MPI X-Green (Extreme Green), GPS-1 and GPS-2: Master Painters
Institute (MPI) Green Performance Standards for Paints and
Coatings [X-Green, GPS-1 and GPS-2]. 2015. Master Painters
Institute, Inc.
http://www.paintinfo.com/mpi/approved/Specification index.shtml.
NFPA 720: Standard for the Installation of Carbon Monoxide (CO)
Detection and Warning Equipment. 2012. National Fire Protection
Association.
NFPA 5000: Building and Construction Safety Code. 2012. National
Fire Protection Association.
PS1-09: Voluntary Product Standard, PS 1-09, Structural Plywood
2015. American Plywood Association.
PS2-10: Performance Standard for Wood-based Structural-Use
Panels. 2011. American Plywood Association.
RESNET: Mortgage Industry National Home Energy Rating System
Standards (RESNET Standard). 2013. Residential Energy Services
Network.
http://www.resnet.us/standards/RESNET Mortgage Industry Nati
onal HERS Standards.pdf.
Resource Conservation and Recovery Act (RCRA): Public law that
creates the framework for the proper management of hazardous
and non-hazardous solid waste.
SCS-EC-10.3.2014: Scientific Certification Systems (SCS) Indoor Air
Quality Product Performance Standard for Building Interiors. 2014.
Scientific Certification Systems.
https://www.scsglobalservices.com/files/standards/scs stn eclO-
3-2014 051614.pdf.
UL 127: Standard for Factory-Built Fireplaces. 2011. Underwriters
Laboratories, Inc.
UL 181A: Standard for Closure Systems for Use with Rigid Air Ducts.
2008. Underwriters Laboratories, Inc.
UL 181B: Standard for Closure Systems for Use with Flexible Air
Ducts and Air Connectors. 2008. Underwriters Laboratories, Inc.
UL 1482: Standard for Solid-Fuel Type Room Heaters. 2011.
Underwriters Laboratories, Inc.
UL 2034: Standard for Single and Multiple Station Carbon Monoxide
Alarms. 2008. Underwriters Laboratories, Inc.
Indoor airPLUS Version 1 (Rev. 04) Construction Specifications (February 2018) 15
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Climate Zones of the Continental United States
All of Alaska is in Zone 7 except for
the following boroughs in Zone 8:
Bethel, Northwest Arctic, Dellingham,
Southeast Fairbanks, Fairbanks N. Star,
Wade Hampton, Nome, Yukon-Koyukuk,
North Slope
Zone 1 includes Hawaii,
Guam, Puerto Rico, and
the Virgin Islands
Marine (C) Dry (B) Moist (A)
I II II
Warm-Humid
below white line
Figure 301.1 Climate Zones of the Continental United States. International Energy Conservation Code
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vvEPA
United States
Environmental Protection
Agency
Office of Air and Radiation (6609J)
EPA-402-K-13/001 I Revised February 2018
7M
m EPA Indoor /
,#airPLUs /
Homes with the Indoor airPLUS label are designed
for improved indoor air quality compared to homes
built to minimum code.
www.epa.gov/indoorairplus
Indoor airPLUS Version 1 (Rev. 04) Construction Specifications (February 2018) 17
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