R401
Replace
Section R401.1 and R401.2 as follows:
R401.1
Scope. This chapter
applies to residential buildings. Municipalities which have
adopted the Stretch Energy Code shall use the energy efficiency requirements of
this chapter, or Chapter 51 where applicable for existing buildings.
Municipalities which have adopted the Municipal Opt-in Specialized Stretch
energy code shall comply with R401.2.4 including both the requirements of
Appendix RC and this chapter.
R401.2
Application. Residential
buildings shall comply with Section R401.2.5 and either Sections R401.2.2,
R401.2.3 or R401.2.4. R-use buildings without individually separate dwelling
units (such as single-room occupancy buildings) may comply with Section
R401.2.1. The option selected for compliance shall be identified in the
certificate required by Section R401.3.
Exception: Additions under 1,000 sf,
level 1 and level 2 alterations, and repairs to existing
buildings complying with Chapter 5 [RE].
R401.2.1
Prescriptive Compliance
Option. The Prescriptive Compliance Option requires compliance with
Sections R401 through R404 and R408.
R401.2.2
Passivehouse Building
Certification Option. The Passivehouse Building Certification Option
requires compliance with Section R405 and R404.4.
R401.2.3
Energy Rating Index
Option. The Energy Rating Index (ERI) Option requires compliance with
Section R406, R403.6 and R404.4.
R401.2.4
Appendix RC.
Residential Buildings and dwelling units covered by this chapter may elect to
comply with the requirements of IECC Appendix RC and R404 as amended.
R401.2.5
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, two of the additional efficiency package options shall be installed
according to Section R408.2.
2. For
buildings electing to be all-electric buildings, both R408.2.2
and R408.2.3 shall apply for primary space heating and domestic hot water
supply.
R402.1.5.1 Add Subsection R402.1.5.1 as
follows:
R402.1.5.1
Approved Software for Total UA Alternative: The following software
is approved for demonstrating Total UA compliance:
REScheck-Web for IECC2021 Massachusetts stretch code
available at
http://www.energycodes.gov/rescheck
R402.4.1.1
Modify Table
R402.4.1.1 to amend the Insulation Installation Criteria as follows:
TABLE R402.4.1.1 AIR BARRIER AND INSULATION
INSTALLATION
|
COMPONENT
|
AIR BARRIER
CRITERIA
|
INSULATION INSTALLATION
CRITERIA
|
|
General requirements
|
A continuous air barrier shall be installed in the
building envelope.
Breaks or joints in the air barrier shall be
sealed.
|
All insulation shall be installed at Grade I
quality in accordance with ICC/RESNET 301.
Air-permeable insulation shall not be used as a
sealing material.
|
403.3.5
Insert the following to the
end of Subsection R403.3.5:
Postconstruction or rough-in testing and verification shall
be done by a HERS Rater, HERS Rating Field Inspector, or an applicable BPI
Certified Professional. A written report of the results of the test shall be
signed by the party conducting the test and provided to the ode
official
R403.6 Replace Section R403.6 as
follows:
R403.6
Mechanical Ventilation. Outdoor air intakes and exhausts shall
have automatic or gravity dampers that close when the ventilation system is not
operating.
Each dwelling unit of a residential building shall be
provided with continuously operating mechanical balanced ventilation system
that has been site verified to meet a minimum airflow per either:
1. RESNET HERS Index in accordance with
RESNET/ICC Standard 301, or
2.
ASHRAE Standard 62.2-2019 or 62.2-2022, or
3. the following formula for one- and
two-family dwellings and townhouses of three or less stories above grade plane:
Q = .03 x CFA + 7.5 x (Nbr +1) - 0.052 x Q50 x S x WSF
Where: CFA is the conditioned floor area in sq. ft.
Nbr is the number of bedrooms
Q50 is the verified blower door air
leakage rate in cfm measured at 50 Pascals
S is the building height factor determined by this
table:
|
Stories above Grade
Plane
|
1
|
2
|
3
|
|
S
|
1.00
|
1.32
|
1.55
|
WSF is the shielded weather factor as determined by this
table:
|
County
|
WSF
|
|
Barnstable
|
0.60
|
|
Berkshire
|
0.52
|
|
Bristol
|
0.54
|
|
Dukes
|
0.59
|
|
Essex
|
0.58
|
|
Franklin
|
0.52
|
|
Hampden
|
0.49
|
|
Hampshire
|
0.59
|
|
Middlesex
|
0.55
|
|
Nantucket
|
0.61
|
|
Norfolk
|
0.52
|
|
Plymouth
|
0.53
|
|
Suffolk
|
0.66
|
|
Worcester
|
0.59
|
R403.6.1 Replace Subsection R403.6.1
and Subsections R403.6.1.1 and R403.6.1.2 as follows:
R403.6.1
Heat or Energy Recovery
Ventilation. Heat or energy recovery balanced ventilation systems shall
be provided for dwelling units as specified in either Section R403.6.1.1 or
R403.6.1.2, as applicable.
R403.6.1.1
Large Systems. Systems with a rated airflow exceeding 300 cfm
shall have an enthalpy recovery ratio of not less than 50% at cooling design
condition and not less than 60% at heating design condition, determined in
accordance with AHRI 1060 at an airflow not less than the design
airflow.
R403.6.1.2
Other
Systems. Systems with a rated airflow of 300 cfm or less shall have a
sensible recovery efficiency (SRE) of not less than 65% at 32°F (0°C)
at an airflow not less than the design airflow. SRE shall be determined in
accordance with CAN/CSA-C439 and shall be listed. Linear interpolation of
listed values for SRE shall be permitted.
R403.6.3 Replace Subsection R403.6.3 as
follows:
R403.6.3
Testing and Verification. Installed performance of the mechanical
ventilation system shall be tested and verified by a HERS Rater, HERS Rating
Field Inspector, or an applicable BPI Certified Professional, and measured
using a flow hood, flow grid, Residential IAQ Fault Indicator Display certified
to the California Energy Commission, or other airflow measuring device in
accordance with either RESNET Standard 380 or ACCA Standard 5.
R403.6.4 - R403.6.7 Add Subsections
R403.6.4 - R403.6.7 as follows:
R403.6.4
Air-moving
equipment, selection and installation. As referenced in
ASHRAE Standard 62.2, Section 7.1, ventilation devices and equipment shall be
tested and certified in accordance with HVI 920 (Home Ventilating Institute),
or equivalent, and the certification label shall be found on the product.
Installation of systems or equipment shall be carried out in accordance with
manufacturers' design requirements and installation instructions. Where
multiple duct sizes and/or exterior hoods are standard options, the minimum
size shall not be used.
R403.6.5
Sound Rating. Sound ratings for fans used for whole building
ventilation shall be rated at a maximum of 1.0 sone.
Exception: HVAC air handlers and remote-mounted
fans need not meet sound requirements. There must be at least four feet of
ductwork between the remote-mounted fan and intake grille.
R403.6.6
Documentation. The
owner and the occupant of the dwelling unit shall be provided with information
on the ventilation design and systems installed, as well as instructions on the
proper operation and maintenance of the ventilation systems. Ventilation
controls shall be labeled with regard to their function, unless the function is
obvious or unless the function is communicated through a digital user interface
provided with the control.
R403.6.7
Air Inlets and Exhausts. All ventilation air inlets shall be
located a minimum of ten feet from vent openings for plumbing drainage systems,
appliance vent outlets, exhaust hood outlets, vehicle exhaust, or other known
contamination sources; and shall not be obstructed by snow, plantings, or any
other material. Outdoor forced air inlets shall be covered with rodent screens
having mesh openings not greater than 1/2 inch. A whole house mechanical
ventilation system shall not extract air from an unconditioned basement unless
approved by a registered design professional. Where wall inlet or exhaust vents
are less than seven feet above finished grade in the area of the venting
including, but not limited to, decks and porches, a metal or plastic
identification plate shall be permanently mounted to the exterior of the
building at a minimum height of eight feet above grade directly in line with
the vent terminal. The sign shall read, in print size no less than 1/2 inch in
size, "MECH. VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS".
Exceptions:
1. Ventilation air inlets in the wall >=
three feet from dryer exhausts and contamination sources exiting through the
roof.
2. No minimum separation
distance shall be required between local exhaust outlets in kitchens/bathrooms
and windows.
3. Vent terminations
that meet the requirements of the National Fuel Gas Code (NFPA 54/ANSI Z223.1)
or equivalent.
R404.4 Add Section R404.4 and Table
R404.4 as follows:
R404.4
Wiring for Electric Vehicle Ready Parking Spaces ("EV Ready
Spaces"). EV Ready Spaces shall be provided in accordance with Table
R404.4. The dedicated branch circuit shall be identified as "EV READY" in the
service panel or subpanel directory, and the termination location shall be
marked as "EV READY". The circuit shall terminate in a NEMA receptacle or a
Society of Automotive Engineers (SAE) Standard SAE J1772 electrical connector
for EV SE servicing
Electric Vehicles, located within 6 feet
(1828 mm) of each
EV ready space. Conductors and outlets for
EVSE shall be sized and installed in accordance with the MA electrical code.
TABLE R404.4 EV READY SPACE REQUIREMENTS
|
Type of
Building
|
Number of Parking
Spaces
|
|
1 & 2 family dwellings and town
homes
|
At least one 50-amp branch circuit per dwelling
unit to provide for AC Level II charging.
|
|
All other R-use buildings
|
At least 20% of spaces served with a 40-amp,
208/240-volt circuit with a minimum capacity of 9.6 kVA.
|
Exceptions:
1. In no case shall the number of required
EV Ready Spaces be greater than the number of parking spaces
installed.
2. This requirement will
be considered met if all spaces which are not EV Ready are
separated from the premises by a public right-of-way.
3. R-2 multi-family properties may elect to
comply with Commercial EV ready requirements in C405.13
4. One or more SAE Level II spaces may be
substituted with multiple SAE Level I spaces provided with wiring for a minimum
20amp, 120 volt EVSE, with a ratio of at least 3 Level I spaces for each Level
II space required.
R405.
Replace Section R405 in its entirety as follows:
Section R405 Passivehouse Building Certification
Option.
R405.1
Compliance. Projects may document compliance with either Phius
certification in accordance with R405.2 or PHI certification in accordance with
R405.3.
Projects pre-certified as meeting the Phius CORE 2021 or
Phius ZERO 2021 Passive Building Standard - North America, or newer,
demonstrated using approved software by Phius, where Phius design-certification
is demonstrated by Phius and a Certified Passive House Consultant (CPHC); or,
Projects pre-certified as meeting the Certified Passive House standard using
the current software and program criteria by the Passive House Institute (PHI),
where PHI certification is demonstrated by a Certified Passive House Designer
and a Certified Passive House Certifier.
R405.2
Phius Documentation. When
using WUFI Passive or other Phius approved software:
1. Prior to the issuance of a building
permit, the following items must be provided to the Building Official:
a. A Phius 2021 (or newer) Verification
Report which demonstrates project compliance with Phius 2021 (or newer)
performance requirements.
b. A
statement from the CPHC that the verification report results accurately reflect
the plans submitted.
c. Evidence of
project registration from Phius.
OR
a. A Design
Certification Letter from Phius.
2. Prior to the issuance of a certificate of
occupancy, the following items must be provided to the building official:
a. Design Certification Letter from
Phius.
b. An updated Verification
Report by the CPHC which reflects "as-built" conditions and test results that
demonstrate project compliance with Phius (blower door and ventilation
results).
c. A statement from the
CPHC that the envelope meets the Phius hygrothermal requirements found in
Appendix B of the Phius 2021 Certification guidebook
d. A statement from the Phius Certified
Verifier or Rater that the project test results and other Phius verification
requirements are met.
e. A copy of
the Phius workbook listing all testing results and as-built conditions.
OR
a. A Project
Certificate demonstrating final certification awarded by Phius.
AND
f. A statement from the Phius Verifier or
Rater of compliance with R404.4: EV ready, and Appendix RB: Solar Ready
Provisions.
R405.3
Passive House International
(PHI) Documentation.
1. If using PHI
Passive House software, prior to the issuance of a building permit, the
following items must be provided to the Building Official:
a. A PHPP compliance report which
demonstrates project compliance with current PHI performance
requirements;
b. A statement from
the Certified Passive House Consultant/Designer (CPHC/D) that the PHPP results
and compliance report accurately reflect the plans submitted;
c. Evidence of project registration from a
Certified Passive House Certifier.
OR
a. A Design
Certification Letter from a Certified Passive House
Certifier.
2. Prior to
the issuance of a certificate of occupancy, the following item(s) must be
provided to the building official:
a. A
Design Certification Letter from a Certified Passive House Certifier.
b. An updated PHPP compliance report which
reflects "as-built" conditions and test results (blower door and ventilation
results) that demonstrate project compliance with PHI performance
requirements;
c. A statement from
the CPHD that the project test results meet the model performance requirements,
all the mandatory limits and any other mandatory requirements.
d. A copy of the Passive House Verifier's or
Rater's test results;
OR
a. A
Final Certification Letter from a Certified Passive House Certifier
AND
e. A
statement from the Passive House Verifier or Rater of compliance with R404.4:
EV ready, and Appendix RB: Solar Ready
Provisions.
R406.2
Revise TABLE R406.2 as
follows:
TABLE R406.2 REQUIREMENTS FOR ENERGY RATING
INDEX
|
SECTIONa
|
TITLE
|
|
R403.6.1
|
Heat or Energy Recoveryl Ventilation
|
|
Electrical Power and Lighting
Systems
|
|
R404.1
|
Lighting equipment
|
|
R404.2
|
Interior lighting controls
|
|
R404.4
|
Wiring for Electric Vehicle Charging
Spaces
|
a. Reference to
a code section includes all of the relevant subsections except as indicated in
the table.
R406.3 Reserve this
section:
R406.3
Building Thermal Envelope. Reserved.
R406.4 Replace Section R406.4 with the
following:
R406.4
Energy Rating Index. The Energy Rating Index (ERI) shall be the
RESNET certified HERS index determined in accordance with RESNET/ICC 301.
Energy used to recharge or refuel a vehicle used for transportation on roads
that are not on the building site shall not be included in the ERI reference
design or the rated design.
R406.5 Replace Section R406.5 and Table
R406.5 with the following:
R406.5
ERI-based Compliance.
Compliance based on an ERI analysis requires that the rated proposed design and
confirmed built dwelling be shown to have an HERS index rating less than or
equal to the appropriate value indicated in Table R406.5 when compared to the
HERS index reference design for each dwelling unit prior to credit for onsite
renewable electric generation.
TABLE R406.5 MAXIMUM ENERGY RATING INDEX
|
Clean Energy
Application
|
Maximum HERS Index
scorea, b
|
|
New construction until June 30,
2024
|
New construction permits after July 1,
2024
|
Major alterations, additions, or Change of
usec
|
|
Mixed-Fuel
Building
|
52
|
42
|
52
|
|
Solar Electric Generation
|
55
|
42
|
55
|
|
All-Electric
Building
|
55
|
45
|
55
|
|
Solar Electric & All-Electric
Building
|
58
|
45
|
58
|
a Maximum HERS rating prior to
onsite renewable electric generation in accordance with Section R406.5
b The building shall meet the
mandatory requirements of Section R406.2, and the building thermal envelope
shall be greater than or equal to the levels of efficiency and SHGC in Table
R402.1.2 or Table R402.1.4 of the 2015 International Energy Conservation
Code.
c Alterations, Additions or Change
of use covered by Section R502.1.1 or R503.1.5 are subject to this maximum HERS
rating.
R406.5.1 Add Subsection R406.5.1, as
follows:
R406.5.1
Trade-off for Clean Energy Systems. New construction following
Section R406 or existing buildings and additions following IECC Chapter 5[RE]
may use clean energy trade-offs to increase the maximum allowable HERS rating
for each unit separately served by any combination of the following:
1. Solar Electric Generation: Solar
photovoltaic array rated at 4kW or higher shall offset three HERS points for
Level 3 alterations, change of use to Residential R-use categories or for fully
attached additions.
2.
All-Electric Buildings shall offset three HERS points for each
dwelling unit in new construction, Level 3 alterations, change of use to
Residential R-use categories and fully attached additions.
R406.6
Revise Section
R406.6 by replacing the reference to Section R406.6 in the first sentence with
reference to Section R406.5.
