Illinois Administrative Code › Title 71 - PUBLIC BUILDINGS, FACILITIES AND REAL PROPERTY › Part 600 - ILLINOIS ENERGY CONSERVATION CODE › Subpart D - RESIDENTIAL BUILDINGS › Appendix A - Supplanted and Additional 2021 International Energy Conservation Code Sections

Current through Register Vol. 48, No. 28, July 12, 2024
The following Code sections shall be referenced in place of
				  the corresponding 2021 IECC sections.
CHAPTER 1 [CE]
SCOPE AND ADMINISTRATION
SECTION C101
SCOPE AND GENERAL
				  REQUIREMENTS
C101.1 Title.
This Code shall be known as the
				  Illinois Energy Conservation Code or Code and shall mean:
With respect to the State facilities covered by 71
				  Ill. Adm. Code 600.Subpart B:
This Part, all additional requirements
				  incorporated within Subpart B (including the 2021 International Energy
				  Conservation Code, including all published errata but excluding published
				  supplements that encompass ASHRAE 90.1 -2019), and any statutorily authorized
				  adaptations to the incorporated standards adopted by CDB, are effective January
				  1, 2024.
With respect to the privately funded commercial
				  facilities covered by 71 Ill. Adm. Code 600.Subpart C:
This Part, all additional requirements
				  incorporated within Subpart C (including the 2021 International Energy
				  Conservation Code, including all published errata and excluding published
				  supplements that encompass ASHRAE 90.1-2019), and any statutorily authorized
				  adaptations to the incorporated standards adopted by CDB, are effective January
				  1, 2024.
C101.1.2 Adoption.
The Board shall adopt
				  amendments to this Code within 12 months after publication of changes to the
				  International Energy Conservation Code. Any such update in this Code shall take
				  effect within 6 months after it is adopted by the Board and shall apply to any
				  new building or structure in this State for which a building permit application
				  is received by a municipality or county, except as otherwise provided by the
				  EEB Act.
C101.1.3 Adaptation.
The Board may appropriately
				  adapt the International Energy Conservation Code to apply to the particular
				  economy, population distribution, geography and climate of the State and
				  construction within the State, consistent with the public policy objectives of
				  the EEB Act.
C101.5 Compliance.
Commercial buildings shall
				  meet the provisions of the Illinois Energy Conservation Code covered by 71 Ill.
				  Adm. Code 600.Subpart C. The local authority having jurisdiction (AHJ) shall
				  establish its own procedures for enforcement of the Illinois Energy
				  Conservation Code. Minimum compliance shall be demonstrated by submission
				  of:
1. Compliance forms published in the ASHRAE 90.1 User's
				  Manual; or
2. Compliance Certificates generated by the U.S. Department
				  of Energy's COMcheckTM Code compliance tool;
				  or
3. Other comparable compliance materials that meet or exceed,
				  as determined by the AHJ, the compliance forms published in the ASHRAE 90.1 User's Manual or the U.S. Department of Energy's
				  COMcheckTM code compliance tool; or
4. The seal of the architect/engineer as required by Section
				  14 of the Illinois Architectural Practice Act [225 ILCS 305  ], Section 12 of the
				  Structural Engineering Licensing Act [225 ILCS 340  ] and Section 14 of the
				  Illinois Professional Engineering Practice Act [225 ILCS 325  ].
C102.1.1 Above Code Programs.
No unit of local
				  government, including any home rule unit, may apply energy efficient building
				  standards to privately funded commercial facilities in a manner that is less
				  stringent than this Code as described in 71 Ill. Adm. Code 600.Subpart C.
				  However, nothing in the EEB Act or Subpart C prevents a unit of local
				  government from adopting an energy efficiency code or standards that are more
				  stringent than this Code. The requirements identified in Table C407.2 shall be
				  met.
SECTION C110
BOARD OF APPEALS
C110.1 General.
In order to hear and decide
				  appeals of orders, decisions or determinations made by the code official
				  relative to the application and interpretation of this Code, there may be
				  created a board of appeals. The code official shall be an ex officio member of
				  the board of appeals but shall not have a vote on any matter before the board.
				  The board of appeals shall be appointed by the governing body and shall hold
				  office at its pleasure. The board shall adopt rules of procedure for conducting
				  its business and shall render all decisions and findings in writing to the
				  appellant with a duplicate copy to the code official
.
C110.3 Qualifications.
The board of appeals
				  shall consist of members who are qualified by experience and training.
CHAPTER 2 [CE]
DEFINITIONS
SECTION C202
GENERAL DEFINITIONS
Approved Source
- means an independent person,
				  firm, or corporation, approved by the building official, who is competent and
				  experienced in the application of engineering principles to materials, methods
				  or systems analyses.
Authority Having Jurisdiction
or
AHJ
- means the organization, officer or individual responsible
				  for approving equipment, materials, an installation or procedure.
Board
- means the Illinois Capital Development
				  Board.
Council
- means the Illinois Energy Conservation
				  Advisory Council whose purpose is to recommend modifications to the Illinois
				  Energy Conservation Code.
Demand Response Signal
- means a signal that
				  indicates a price or a request to modify electricity consumption for a limited
				  time period.
Demand Responsive Control
- means a control
				  capable of receiving and automatically responding to a demand response
				  signal.
EEB Act
- means the Energy Efficient Building
				  Act [20 ILCS 3125  ].
Photosynthetic Photon Efficacy (PPE) -
means a
				  photosynthetic photon flux divided by input electric power in units of
				  micromoles per second per watt, or micromoles per joule as defined by
				  ANSI/ASABE S640.
CHAPTER 4 [CE]
COMMERCIAL ENERGY
				  EFFICIENCY
SECTION C402
BUILDING ENVELOPE
				  REQUIREMENTS
C402.4.1.3 Fenestration Orientation
The vertical fenestration shall comply with equation either
				  (a) or (b)
a. AW [LESS THAN OR EQUAL TO] (AT)/4 and AE [LESS THAN OR
				  EQUAL TO] (AT)/4
b. AW x SHGCW [LESS THAN OR EQUAL TO] (AT x SHGCC)/5 and AE x
				  SHGCE [LESS THAN OR EQUAL TO] (AT x SHGCC)/5
where
Aw = west-oriented vertical fenestration area (oriented
				  within 45 degrees of true west to the south and within 22.5 degrees of true
				  west to the north in the northern hemisphere)
Ae = east-oriented vertical fenestration area (oriented
				  within 45 degrees of true east to the south and within 22.5 degrees of true
				  east to the north in the northern hemisphere)
AT = total vertical fenestration area
SHGCC = SHGC criteria in Table C402.4
SHGCE = SHGC for east-oriented fenestration
SHGCW = SHGC for west-oriented fenestration
Exceptions:
1. Buildings with shade on 75% of the east- and west-oriented
				  vertical fenestration areas from permanent projections, existing buildings,
				  existing permanent infrastructure, or topography at 9 a.m. and 3 p.m.,
				  respectively, on the summer solstice (June 21).
2. Alterations and additions with no increase in vertical
				  fenestration area.
3. Buildings where the west-oriented and east-oriented
				  vertical fenestration area does not exceed 20% of the gross wall area for each
				  of those façades, and SHGC on those facades is no greater than 90% of
				  the criteria in Table C402.4.
C402.5.1 Air Barriers.
A continuous air barrier
				  shall be provided throughout the building thermal envelope. The air barriers
				  shall be permitted to be located on the inside or outside of the building
				  envelope, located within the assemblies composing the envelope, or any
				  combination thereof. The air barrier shall comply with Sections C402.5.1.1 and
				  C402.5.1.2. For roof air barriers on existing buildings, refer to Section
				  C503.1 or C504.2.
Exception:
Air barriers are not required in
				  buildings located in Climate Zone 2B.
C402.5.1.1 Air Barrier Construction.
The
				  continuous air barrier shall be constructed to comply with the
				  following:
1. The air barrier shall be continuous for all assemblies
				  that are the thermal envelope of the building and across the joints and
				  assemblies.
2. Air barrier joints and seams shall be sealed, including
				  sealing transitions at joints between dissimilar materials. The joints and
				  seals shall be securely installed in or on the joint for its entire length so
				  as not to dislodge, loosen or otherwise impair its ability to resist positive
				  and negative pressure from wind, stack effect and mechanical
				  ventilation.
3. Penetrations of the air barrier shall be caulked, gasketed
				  or otherwise sealed in a manner compatible with the construction materials and
				  location. Sealings shall allow for expansion, contraction and mechanical
				  vibration. Paths for air leakage from the building to the space between the
				  roof deck and roof covering used air barrier shall be caulked, gasketed or
				  otherwise covered with a moisture vapor-permeable material. Joints and seams
				  associated with penetrations shall be sealed in the same manner or taped.
				  Sealing materials shall be securely installed around the penetration so as not
				  to dislodge, loosen or otherwise impair the penetrations' ability to resist
				  positive and negative pressure from wind, stack effect and mechanical
				  ventilation. Sealing of concealed fire sprinklers, where required, shall be in
				  a manner that is recommended by the manufacturer. Caulking or other adhesive
				  sealants shall not be used to fill voids between fire sprinkler cover plates
				  and walls or ceilings.
4. Recessed lighting fixtures shall comply with Section
				  C402.5.8. Where similar objects are installed that penetrate the air barrier,
				  provisions shall be made to maintain the integrity of the air barrier.
SECTION C405
ELECTRICAL POWER AND LIGHTING
				  SYSTEMS
C405.4 Lighting for plant growth and
				  maintenance.
All permanently installed luminaires used for plant growth
				  and maintenance shall have a photosynthetic photon efficacy as defined in
				  accordance with ANSI/ASABE S640 of not less than 1.7
									µmol/J for
				  greenhouses and not less than 2.2
									µmol/J for all other indoor growing
				  spaces.
Exception:
The following buildings
				  are exempt:
1. Buildings with no more than 40kW of aggregate
				  horticultural lighting load.
2. Cannabis facilities subject to  410 ILCS
				  705/10-45  - the Cannabis Regulation and Tax Act.
SECTION C406
ADDITIONAL EFFICIENCY
				  REQUIREMENTS
C406.1 Additional energy efficiency credit
				  requirements.
New buildings shall achieve a total of 10 credits from
				  Tables C406.1(1) through C406.1(5) where the table is selected based on the use
				  group of the building and from credit calculations as specified in relevant
				  subsections of Section C406. Where a building contains multiple-use groups,
				  credits from each use group shall be weighted by floor area of each group to
				  determine the weighted average building credit. Credits from the tables or
				  calculation shall be achieved where a building complies with one or more of the
				  following:
1. More efficient HVAC performance in accordance
				  with Section C406.2.
2. Reduced lighting power in accordance with
				  Section C406.3.
3. Enhanced lighting controls in accordance with
				  Section C406.4.
4. On-site supply of renewable energy in
				  accordance with Section C406.5.
5. Provision of a dedicated outdoor air system for
				  certain HVAC equipment in accordance with Section C406.6.
6. High-efficiency service water heating in
				  accordance with Section C406.7.
7. Enhanced envelope performance in accordance
				  with Section C406.8.
8. Reduced air infiltration in accordance with
				  Section C406.9
9. Where not required by Section C405.12, include
				  an energy monitoring system in accordance with Section C406.10.
10. Where not required by Section C403.2.3,
				  include a fault detection and diagnostics (FDD) system in accordance with
				  Section C406.11.
11. Efficient kitchen equipment in accordance with
				  Section C406.12.
12. HVAC demand responsive controls and more
				  efficient HVAC performance in accordance with Section C406.2 and Section
				  C406.13.
13. Water heating demand responsive controls and
				  high-efficiency service water heating in accordance with Section C406.7 and
				  Section C406.14.
Modify Table C406.1(1) as follows:
Table C406.1(1) Additional Energy
				  Efficiency Credits for Group B Occupants
Climate Zone:
4A
5A
C406.13 HVAC demand responsive controls
2
2
C406.14 Water heating demand responsive
							 controls
1
1
Modify Table C406.1(2) as follows:
Table C406.1(2) Additional Energy
				  Efficiency Credits for Group R and I Occupancies
Climate Zone:
4A
5A
C406.13 HVAC demand responsive controls
4
3
C406.14 Water heating demand responsive
							 controls
1
1
Modify Table C406.1(3) as follows:
Table C406.1(3) Additional Energy
				  Efficiency Credits for Group E Occupancies
Climate Zone:
4A
5A
C406.13 HVAC demand responsive controls
4
4
C406.14 Water heating demand responsive
							 controls
1
1
Modify Table C406.1(4) as follows:
Table C406.1(4) Additional Energy
				  Efficiency Credits for Group M Occupancies
Climate Zone:
4A
5A
C406.13 HVAC demand responsive controls
4
3
C406.14 Water heating demand responsive
							 controls
x
x
Modify Table C406.1(5) as follows:
Table C406.1(5) Additional Energy
				  Efficiency Credits for Other* Occupancies
Climate Zone:
4A
5A
C406.13 HVAC demand responsive controls
3
3
C406.14 Water heating demand responsive
							 controls
2
2
C406.1.1 Tenant spaces.
Tenant spaces shall
				  comply with sufficient options from Tables C406.1(1) through C406.1(5) to
				  achieve a minimum number of 5 credits, where credits are selected from Section
				  C406.2, C406.3, C406.4, C406.6, C406.7 or C406.10. Where the entire building
				  complies using credits from Section C406.5, C406.8, C406.9, or C406.13 tenant
				  spaces shall be deemed to comply with this section.
C406.13 HVAC demand responsive controls.
Buildings shall be provided with demand responsive controls capable of
				  executing the following actions in response to a demand response signal:
1. Automatically increasing the zone operating
				  cooling set point by the following values: 1°F (0.5
									°C), 2°F
				  (1°C), 3°F (1.5°C), and 4°F (2°C).
2. Automatically decreasing the zone operating
				  heating set point by the following values: 1°F (0.5°C), 2°F
				  (1°C), 3°F (1.5°C), and 4°F (2°C).
Where a demand response signal is not available the heating
				  and cooling system controls shall be capable of performing all other functions.
				  Where thermostats are controlled by direct digital control including, but not
				  limited to, an energy management system, the system shall be capable of demand
				  responsive control and capable of adjusting all thermal setpoints to comply.
				  The demand responsive controls shall comply with either Section C406.13.1 or
				  Section C406.13.2
C406.13.1 Air conditioners and heat pumps
				  with two or more stages of control and cooling capacity of less than 65,000
				  Btu/h.
Thermostats for air conditioners and heat pumps with two or more
				  stages of control and a cooling capacity less than 65,000 Btu/h (19 kW) shall
				  be provided with a demand responsive control that complies with the
				  communication and performance requirements of AHRI 1380.
C406.13.2 All other HVAC systems.
Thermostats for HVAC systems shall be provided with a demand responsive control
				  that complies with one of the following:
1. Certified OpenADR 2.0 a VEN, as specified under
				  Clause 11, Conformance
2. Certified OpenADR 2.0b VEN, as specified under
				  Clause 11, Conformance
3. Certified by the manufacturer as being capable
				  of responding to a demand response signal from a certified OpenADR 2.0b VEN by
				  automatically implementing the control functions requested by the VEN for the
				  equipment it controls
4. IEC 62746-10-1
5. The communication protocol required by a
				  controlling entity, such as a utility or service provider, to participate in an
				  automated demand response program
6. The physical configuration and communication
				  protocol of CTA 2045-A or CTA 2045-B.
C406.14 Water heating demand responsive
				  controls.
Electric storage water heaters with a rated water storage
				  volume of 40 gallons (150L) to 120 gallons (450L) and a nameplate input rating
				  equal to or less than 12kW shall be provided with demand responsive controls in
				  accordance with Table C406.14 or another equivalent approved standard.
Table C406.14
Demand Responsive CONTROLS FOR Water
				  Heating
Equipment Type
Controls
Electric storage water heaters
Manufactured before 7/1/2025
Manufactured on or after 7/1/2025
ANSI/CTA-2045-B Level 1 and also capable of
							 initiating water heating to meet the temperature set point in response to a
							 demand response signal.
ANSI/CTA-2045-B Level 2, except "Price Stream
							 Communication" functionality as defined in the standard.
SECTION C407
TOTAL BUILDING PERFORMANCE
Modify Table C407.2 as follows:
TABLE C407.2
REQUIREMENTS FOR TOTAL BUILDING
				  PERFORMANCE
SECTIONa
TITLE
Envelope
C402.4.1.3
Fenestration Orientation
Modify Table C407.4.1(1) as follows:
TABLE C407.4.1(1)
SPECIFICATIONS FOR THE STANDARD
				  REFERENCE AND PROPOSED DESIGNS
Vertical fenestration other than opaque doors
Area
1. The proposed vertical fenestration area; where the
							 proposed vertical fenestration area is less than 40 percent of the above-grade
							 wall area.
2. 40 percent of above grade wall area; where the
							 proposed vertical fenestration area is 40 percent or more of the above grade
							 wall area
3. Fenestration orientation shall comply with
							 C402.4.1.3
As proposed
U-factor: as specified in Table C402.4
As proposed
1. SHGC: as specified in Table C402.4 except that for
							 climates with no requirement (NR) SHGC = 0.40 shall be used.
2. Fenestration SHGC shall comply with
							 C402.4.1.3
As proposed
External shading and PF: none
As proposed
CHAPTER 5 [CE]
EXISTING BUILDINGS
SECTION C503
ALTERATIONS
C503.2.1 Roof Replacement.
Roof replacements
				  shall comply with Section C402.1.3, C402.1.4, C402.1.5 or C407 where the
				  existing roof assembly is part of the building thermal envelope and contains
				  insulation entirely above the roof deck. In no case shall the R-value of the
				  roof insulation be reduced or the U-factor of the roof assembly be increased as
				  part of the roof replacement.
Exceptions:
Where compliance with Section C402.1 cannot be met due to limiting conditions on an existing roof, an approved
				  design shall be submitted with the following:
1. Construction documents that include a report by a
				  registered design professional or an approved source documenting details of the
				  limiting conditions affecting compliance with the insulation
				  requirements.
2. Construction documents that include a roof design by a
				  registered design professional or an approved source that minimizes deviation
				  from the insulation requirements.
Chapter 6 [CE]
Referenced Standards
ASME
ASME
Two Park Avenue
New York, NY 10016-5990
BPVC
Boiler and Pressure Vessel Code
AHRI
Air-Conditioning, Heating, & Refrigeration
							 Institute
2111 Wilson Blvd, Suite 500
Arlington, VA 22201
1380-2019
Demand Response through Variable Capacity HVAC
							 Systems in Residential and Small Commercial Applications
ANSI
American National Standards Institute
25 West 43rd Street, 4th Floor
New York, NY 10036
ANSI/CTA-2045-A-2018
Modular Communications Interface for Energy
							 Management
ANSI/CTA-2045-B-2019
Modular Communications Interface for Energy
							 Management
CTA
Consumer Technology Association
1919 S. Eads Street
Arlington, VA 22202
ANSI/CTA-2045-B
Modular Communications Interface for Energy
							 Management C404.11
IEC
IEC Regional Centre for North America
IEC International Electrotechnical Commission
446 Main Street 16th Floor
Worcester, MA 016808
IEC 62746-10-1 - 2018
Systems interface between customer energy management
							 system and the power management system - Part 10-1: Open automated demand
							 response
CHAPTER 1 [RE]
SCOPE AND ADMINISTRATION
SECTION R101
SCOPE AND GENERAL
				  REQUIREMENTS
R101.1 Title.
This Code shall be known as the
				  Illinois Energy Conservation Code or this Code, and shall mean:
With respect to the residential buildings covered
				  by 71 Ill. Adm. Code 600.Subpart D:
This Part, all additional requirements
				  incorporated within Subpart D (including the 2021 International Energy
				  Conservation Code, including all published errata but excluding published
				  supplements) and any statutorily authorized adaptations to the incorporated
				  standards adopted by CDB are effective January 1, 2024.
R101.1.2 Adoption.
The Board shall adopt
				  amendments to this Code within 12 months after publication of changes to the
				  International Energy Conservation Code. Any such update in this Code shall take
				  effect within 6 months after it is adopted by the Board and shall apply to any
				  new building or structure in this State for which a building permit application
				  is received by a municipality or county, except as otherwise provided by the
				  EEB Act.
R101.1.3 Adaptation.
The Board may appropriately
				  adapt the International Energy Conservation Code to apply to the particular
				  economy, population distribution, geography and climate of the State and
				  construction within the State, consistent with the public policy objectives of
				  the EEB Act.
R101.5 Compliance.
Residential buildings shall
				  meet the provisions of the Illinois Energy Conservation Code covered by 71 Ill.
				  Adm. Code 600.Subpart D. The local authority having jurisdiction (AHJ) shall
				  establish its own procedures for enforcement of the Illinois Energy
				  Conservation Code. Minimum compliance shall be demonstrated by submission
				  of:
1. Compliance Certificates generated by the U.S. Department
				  of Energy's REScheckTM Code compliance tool;
				  or
2. Other comparable compliance materials that meet or exceed,
				  as determined by the AHJ, U.S. Department of Energy's
				  REScheckTM Code compliance tool; or
3. The seal of the architect/engineer as required by Section
				  14 of the Illinois Architectural Practice Act [225 ILCS 305  ], Section 12 of the
				  Structural Engineering Licensing Act [225 ILCS 340  ] and Section 14 of the
				  Illinois Professional Engineering Practice Act [225 ILCS 325  ].
SECTION R102
ALTERNATIVE MATERIALS DESIGN AND
				  METHODS
OF CONSTRUCTION AND
				  EQUIPMENT
R102.1.1 Above Code Programs.
No unit of local
				  government, including any home rule unit, may regulate energy efficient
				  building standards for residential building in a manner that is either less or
				  more stringent than the standards established pursuant to this Code. Buildings
				  shall be considered to be in compliance with this code when those buildings
				  also meet the requirements identified in Table R405.2 and the building thermal
				  envelope is greater than or equal to levels of efficiency and solar heat gain
				  coefficients (SHGC) in Tables 402.1.1 and 402.1.3 of the 2009 International
				  Energy Conservation Code.
However, the following entities may regulate energy efficient
				  building standards for residential buildings in a manner that is more stringent
				  than the provisions contained in this Code:
i) A unit of local government, including a home rule unit,
				  that has, on or before May 15, 2009, adopted or incorporated by reference
				  energy efficient building standards for residential buildings that are
				  equivalent to or more stringent than the 2006 International Energy Conservation
				  Code;
ii) A unit of local government, including a home rule unit,
				  that has, on or before May 15, 2009, provided to the Capital Development Board,
				  as required by Section 10.18 of the Capital Development Board Act, an
				  identification of an energy efficient building code or amendment that is
				  equivalent to or more stringent than the 2006 International Energy Conservation
				  Code; and
iii) A municipality with a population of 1,000,000 or
				  more.
SECTION R110
MEANS OF APPEALS
R110.1 General.
In order to hear and decide
				  appeals of orders, decisions or determinations made by the code official
				  relative to the application and interpretation of this Code, there may be
				  created a board of appeals. The code official shall be an ex officio member of
				  the board of appeals but shall not have a vote on any matter before the board.
				  The board of appeals shall be appointed by the governing body and shall hold
				  office at its pleasure. The board shall adopt rules of procedure for conducting
				  its business and shall render all decisions and findings in writing to the
				  appellant with a duplicate copy to the code official
.
R110.3 Qualifications.
The board of appeals
				  shall consist of members who are qualified by experience and training.
CHAPTER 2 [RE]
DEFINITIONS
SECTION R202
GENERAL DEFINITIONS
Approved Source
- means an independent person,
				  firm, or corporation, approved by the building official, who is competent and
				  experienced in the application of engineering principles to materials, methods
				  or systems analyses.
Authority Having Jurisdiction
or
AHJ
- means the organization, officer or individual responsible
				  for approving equipment, materials, an installation or procedure.
Board
- means the Illinois Capital Development
				  Board.
Council
- means the Illinois Energy Conservation
				  Advisory Council whose purpose is to recommend modifications to the Illinois
				  Energy Conservation Code.
EEB Act
- means the Energy Efficient Building
				  Act [20 ILCS 3125  ].
Local Exhaust
- means an exhaust system that
				  uses one or more fans to exhaust air from a specific room or rooms within a
				  dwelling.
Residential Building
- means a detached
				  one-family or 2-family dwelling or any building that is 3 stories or less in
				  height above grade that contains multiple dwelling units, in which the
				  occupants reside on a primarily permanent basis, such as a townhouse, a row
				  house, an apartment house, a convent, a monastery, a rectory, a fraternity or
				  sorority house, a dormitory and a rooming house; provided, however, that when
				  applied to a building located within the boundaries of a municipality having a
				  population of 1,000,000 or more, the term "residential building" means a
				  building containing one or more dwelling units, not exceeding 4 stories above
				  grade, where occupants are primarily permanent.
Whole House Mechanical Ventilation System
-
				  means an exhaust system, supply system or combination thereof that is designed
				  in accordance with Section R403.6 to mechanically exchange indoor air with
				  outdoor air when operating continuously or through a programmed intermittent
				  schedule to satisfy the whole house ventilation rates. Outdoor air intakes and
				  exhausts shall have automatic or gravity dampers that close when the
				  ventilation system is not operating.
CHAPTER 4 [RE]
RESIDENTIAL ENERGY
				  EFFICIENCY
SECTION R401
GENERAL
R401.2 Application.
Residential buildings shall
				  comply with Section R401.2.6 and either Sections R401.2.1, R401.2.2, R401.2.3,
				  R401.2.4 or R401.2.5.
Exception
: Additions, alterations, repairs and
				  changes of occupancy to existing buildings complying with Chapter 5.
R401.2.5 Phius Alternative Compliance Option.
The Phius Alternative Compliance Option requires compliance with Section
				  R409.
R401.2.6 Additional energy efficiency
. This
				  Section establishes additional requirements applicable to all compliance
				  approaches to achieve additional energy efficiency.
1. For buildings complying with Section R401.2.1, one of the
				  additional efficiency package options shall be installed according to Section
				  R408.2.
2. For buildings complying with Section R401.2.2, the
				  building shall meet one of the following:
2.1. One of the additional efficiency package
				  options in Section R408.2 shall be installed without including such measures in
				  the proposed design under Section R405; or
2.2. The proposed design of the building under
				  Section R405.3 shall have an annual energy cost that is less than or equal to
				  95 percent of the annual energy cost of the standard reference design.
3. For buildings complying with the Energy Rating Index
				  alternative Section R401.2.3, the Energy Rating Index value shall be at least 5
				  percent less than the Energy Rating Index target specified in Table
				  R406.5.
The option selected for compliance shall be
				  identified in the certificate required by Section R401.3.
SECTION R402
BUILDING THERMAL ENVELOPE
Modify Table R402.1.2 as follows:
TABLE R402.1.2
MAXIMUM ASSEMBLY U-FACTORS INSULATION
				  AND FENESTRATION REQUIREMENTS
CLIMATE ZONE
CEILING
U-FACTOR
4 except Marine
0.026
5 and Marine 4
0.026
Modify Table R402.1.3 as follows:
TABLE R402.1.3
INSULATION MINIMUM R-VALUES AND
				  FENESTRATION REQUIREMENTS BY COMPONENT
a
CLIMATE ZONE
CEILING
R-VALUE
4 except Marine
49
5 and Marine 4
49
R402.2.1 Roof/Ceilings with attic spaces.
Where
				  Section R402.1.3 requires R-49 insulation in the ceiling or attic, installing
				  R-38 over 100 percent of the ceiling or attic area requiring insulation shall
				  satisfy the requirement for R-49 insulation wherever the full height of
				  uncompressed R-38 insulation extends over the wall top plate at the eaves.
				  Where Section R402.1.3 requires R-60 insulation in the ceiling, installing R-49
				  over 100 percent of the ceiling area requiring insulation shall satisfy the
				  requirement for R-60 insulation wherever the full height of uncompressed R-49
				  insulation extends over the wall top plate at the eaves. This reduction shall
				  not apply to the insulation and fenestration criteria in Section R402.1.2 and
				  the Total UA alternative in Section R402.1.5.
R402.2.2 Roof/Ceilings Without Attic Spaces.
When Section R402.1.3 requires insulation R-values greater than R-30 in the
				  interstitial space above a ceiling and below the structural roof deck, and the
				  design of the roof/ceiling assembly does not allow sufficient space for the
				  required insulation, the minimum required insulation R-value for those
				  roof/ceiling assemblies shall be R-30. Insulation shall extend over the top of
				  the wall plate to the outer edge of the plate and shall not be compressed. This
				  reduction of insulation from the requirements of Section R402.1.3 shall be
				  limited to 500 square feet (46 m2) or 20 percent of
				  the total insulated ceiling area, whichever is less. This reduction shall not
				  apply to the Total UA alternative in Section R402.1.5.
R402.2.8.1 Basement wall insulation
				  installation.
Where basement walls are insulated, the insulation shall
				  be installed from the top of the basement wall down to 10 feet (3048 mm) below
				  grade or to within 6 inches (152 mm) of the basement floor, whichever is
				  less.
SECTION R403
SYSTEMS
R403.3 Ducts.
Ducts and air handlers shall be
				  insulated, sealed, tested and installed in accordance with Sections R403.3.1
				  through R403.3.7. When required by the code official, duct testing shall be
				  conducted by an approved third party. A written report of the results of the
				  test shall be signed by the party conducting the test and provided to the code
				  official.
R403.3.5 Duct testing.
Ducts shall be pressure tested in accordance with
				  ANSI/RESNET/ICC 380 or ASTM E1554 to determine air leakage by one of the
				  following methods:
1. Rough-in test: Total leakage shall be measured with a
				  pressure differential of 0.1 inch w.g. (25 Pa) across the system, including the
				  manufacturer's air handler enclosure if installed at the time of the test.
				  Registers shall be taped or otherwise sealed during the test.
2. Postconstruction test: Total leakage shall be measured
				  with a pressure differential of 0.1 inch w.g. (25 Pa) across the entire system,
				  including the manufacturer's air handler enclosure. Registers shall be taped or
				  otherwise sealed during the test.
Exception:
A duct air-leakage test
				  shall not be required for ducts serving ventilation systems that are not
				  integrated with ducts serving heating or cooling systems.
R403.3.6 Duct Leakage.
The total leakage of the ducts, where measured in accordance
				  with Section R403.3.5, shall be as follows:
1. Rough-in test: The total leakage shall be less than or
				  equal to 4.0 cubic feet per minute (113.3 L/min) per 100 square feet (9.29 m2) of conditioned floor area where the air handler
				  is installed at the time of the test. Where the air handler is not installed at
				  the time of the test, the total leakage shall be less than or equal to 3.0 cubic feet per minute (85 L/min) per 100 square feet (9.29 m2) of conditioned floor area.
Exception
: If the HVAC duct system is
				  serving less than or equal to 1,500 square feet of conditioned floor area, the
				  allowable duct leakage with the air-handler installed shall be 60 cubic feet
				  per minute or less.
2. Postconstruction 5test: Total leakage shall be less than
				  or equal to 4.0 cubic feet per minute (113.3 L/min) per 100 square feet (9.29 m2 ) of conditioned floor area.
Exception
: If the HVAC duct system is
				  serving less than or equal to 1,500 square feet of conditioned floor area, the
				  allowable duct leakage shall be 60 cubic feet per minute or less.
3. Test for ducts within thermal envelope: Where all ducts
				  and air handlers are located entirely within the building thermal envelope,
				  total leakage shall be less than or equal to 8.0 cubic feet per minute (226.6 L/min) per 100 square feet (9.29 m2) of conditioned
				  floor area.
Exception
: If the HVAC duct system is
				  serving less than or equal to 750 square feet of conditioned floor area, the
				  allowable duct leakage with the air-handler installed shall be 60 cubic feet
				  per minute or less.
R403.6 Mechanical Ventilation.
The building or
				  dwelling unit complying with Section R402.4.1 shall be provided with
				  ventilation that complies with the requirements of this section or the
				  International Mechanical Code, as applicable, or with other approved means of
				  ventilation. Outdoor air intakes and exhausts shall have automatic or gravity
				  dampers that close when the ventilation system is not operating.
R403.6.4 Recirculation of Air.
Exhaust air from
				  bathrooms and toilet rooms shall not be recirculated within a residence or
				  circulated to another dwelling unit and shall be exhausted directly to the
				  outdoors. Exhaust air from bathrooms, toilet rooms and kitchens shall not
				  discharge into an attic, crawl space or other areas inside the building. This
				  section shall not prohibit the installation of ductless range hoods when
				  installed in accordance with the manufacturer's instructions, and where
				  mechanical or natural ventilation is otherwise provided, listed and labeled
				  ductless range hoods shall not be required to discharge to the outdoors.
R403.6.5 Exhaust equipment.
Exhaust fans and
				  whole-house ventilation fans shall be listed and labeled as providing the
				  minimum required airflow in accordance with ANSI/AMCA 210-ANSI/ASHRAE
				  51.
R403.6.6 Whole-house Mechanical Ventilation
				  System.
Whole-house mechanical ventilation systems shall be designed in
				  accordance with Sections R403.6.6.1 through R403.6.6.4.
R403.6.6.1 System Design.
The whole-house
				  ventilation system shall consist of one or more supply or exhaust fans, or a
				  combination of such, and associated ducts and controls. Local exhaust or supply
				  fans are permitted to serve as such a system. Outdoor air ducts connected to
				  the return side of an air handler shall be considered to provide supply
				  ventilation.
R403.6.6.2 System Controls.
The whole-house
				  mechanical ventilation system shall be provided with controls that enable
				  manual override. Controls shall include text or a symbol indicating their
				  function.
R403.6.6.3 Mechanical Ventilation Rate.
The
				  whole house mechanical ventilation system shall provide outdoor air at a
				  continuous rate of not less than that determined in accordance with Table
				  R403.6.6.3(1) or Equation 4-0.
Ventilation rate in cubic feet per minute = (0.01 x total square foot area of house) + [7.5 x (number of bedrooms +1)] Equation
				  4-0
Exceptions:
1. Ventilation rate credit. The minimum mechanical
				  ventilation rate determined in accordance with Table R403.6.6.3(1) or Equation
				  4-0 shall be reduced by 30 percent, provided that both of the following
				  conditions apply:
1.1 A ducted system supplies ventilation air
				  directly to each bedroom and to one or more of the following rooms:
1.1.1. Living room.
1.1.2 Dining room.
1.1.3 Kitchen.
1.2 The whole-house ventilation system is a
				  balanced ventilation system.
2. Programmed intermittent operation. The whole-house
				  mechanical ventilation system is permitted to operate intermittently where the
				  system has controls that enable operation for not less than 25 percent of each
				  4-hour segment and the ventilation rate in Table R403.6.6.3(1), by Equation 4-0
				  or by Exception 1 is multiplied by the factor determined in accordance with
				  Table R403.6.6.3(2)
R403.6.6.3.1 Different Occupant Density.
Table
				  R403.6.6.3(1) assumes 2 persons in a dwelling unit and an additional person for
				  each additional bedroom. When higher occupant densities are known, the airflow
				  rate shall be increased by 7.5 cfm (3.5 L/s) for each additional person. When
				  approved by the authority having jurisdiction, lower occupant densities may be
				  used.
R403.6.6.3.2 Airflow Measurement.
The airflow
				  rate required is the quantity of outdoor ventilation air supplied and/or indoor
				  air exhausted by the whole-house mechanical ventilation system installed, and
				  shall be measured using a flow hood, flow grid, or other airflow measuring
				  device. Ventilation airflow of systems with multiple operating modes shall be
				  tested in all modes designed to meet Section R403.6.6.3. When required by the
				  code official
,
testing shall be conducted by an approved third
				  party. A written report of the results of the test, indicating the verified
				  airflow rate, shall be signed by the party conducting the test and provided to
				  the code official.
R403.6.6.4 Local Exhaust Rates.
Local exhaust
				  systems shall be designed to have the capacity to exhaust the minimum air flow
				  rate determined in accordance with Table R403.6.6.4.
TABLE R403.6.6.3(1)
CONTINUOUS WHOLE-HOUSE
				  MECHANICAL
VENTILATION SYSTEM AIRFLOW RATE
				  REQUIREMENTS
DWELLING UNIT FLOOR AREA (square
							 feet)
NUMBER OF BEDROOMS
0 - 1
2 - 3
4 - 5
6 - 7
> 7
Airflow in CFM
< 1,500
30
45
60
75
90
1,501 - 3,000
45
60
75
90
105
3,001 - 4,500
60
75
90
105
120
4,501 - 6,000
75
90
105
120
135
6,001 - 7,500
90
105
120
135
150
> 7,500
105
120
135
150
165
For SI: 1 square foot = 0.0929 m2,
				  1 cubic foot per minute = 0.0004719 m3/s.
TABLE R403.6.6.3(2)
INTERMITTENT WHOLE-HOUSE
				  MECHANICAL
VENTILATION RATE FACTORSa,
					 b
RUN-TIME PERCENTAGE IN EACH
							 4-HOUR SEGMENT
25%
33%
50%
66%
75%
100%
Factor 
							 a
4
3
2
1.5
1.3
1.0
a For ventilation system run time
				  values between those given, the factors are permitted to be determined by
				  interpolation.
b Extrapolation beyond the table
				  is prohibited.
TABLE R403.6.6.4
MINIMUM REQUIRED LOCAL EXHAUST RATES
				  FOR
ONE- AND TWO-FAMILY
				  DWELLINGS
AREA TO BE
							 EXHAUSTED
EXHAUST
							 RATESa
Kitchens
100 cfm intermittent or 25 cfm continuous
Bathrooms-Toilet Rooms
Mechanical exhaust capacity of 50 cfm intermittent or
							 20 cfm continuous
For SI: 1 cubic foot per minute = 0.0004719 m3/s.
a. The listed exhaust rate for bathrooms-toilet rooms shall
				  equal or exceed the exhaust rate at a minimum static pressure of 0.25 inch
				  water column in accordance with Section R403.6.5.
SECTION R409
PHIUS ALTERNATIVE COMPLIANCE
				  OPTION
R409.1 Scope.
This section establishes criteria
				  for compliance via the Phius 2021 Standard
.
R409.2 Phius Standard compliance.
Compliance
				  based on the Phius 2021 Standard will include its United States Department of
				  Energy (USDOE) Energy Star and Zero Energy Ready Home co-requisites, and either
				  performance calculations by Phius-approved software or through the use of the
				  Phius 2021 Prescriptive Path.
R409.2.1 Phius documentation.
Prior to the
				  issuance of a building permit, the following items must be provided to the code
				  official:
1. A list of compliance features.
2. A Phius precertification letter.
R409.2.2 Project certificate.
Prior to the
				  issuance of a certificate of occupancy, the following item must be provided to
				  the code official:
1. A Phius 2021 (or later) project
				  certificate.
SECTION R503
ALTERATIONS
R503.1.1.2 Roof Replacement.
Insulation shall
				  comply with Section R402.1. Alternatively, where limiting conditions prevent
				  compliance with Section R402.1, an approved design that minimizes deviation
				  from Section R402.1 shall be provided for the following alterations:
1. Roof replacements or a roof alteration that includes
				  removing and replacing the roof covering where the roof assembly includes
				  insulation entirely above the roof deck, where limiting conditions require use
				  of an approved design to minimize deviation from Section R402.1 for a Group R-2
				  building, a registered design professional or other approved source shall
				  provide construction documents that identify the limiting conditions and the
				  means to address them.