Alterations to components of existing multifamily buildings, including alterations made in conjunction with a change in building occupancy to a multifamily occupancy shall meet item (a), and either Item (b) or (c) below:
EXCEPTION 1 to Section 180.2: When heating, cooling or service water heating for an alteration are provided by expanding existing systems, the existing systems and equipment need not comply with Sections 110.0 through 110.10, 160.0 through 160.7, and Section 170.2(c) 170.2(d).
EXCEPTION 2 to Section 180.2: When existing heating, cooling or service water heating systems or components are moved within a building, the existing systems or components need not comply with Sections 110.0 through 110.10, 160.0 through 160.7, and Section 170.2(c) or 170.2(d).
EXCEPTION 3 to Section 180.2: Where an existing system with electric reheat is expanded when adding variable air volume (VAV) boxes to serve an alteration, total electric reheat capacity may be expanded not to exceed 20 percent of the existing installed electric capacity in any one permit and the system need not comply with Section 170.2(b)4E. Additional electric reheat capacity in excess of 20 percent may be added subject to the requirements of the Section 170.2(b)4E.
EXCEPTION 4 to Section 180.2: The requirements of Section 160.3(a)2H shall not apply to alterations of space-conditioning systems or components.
EXCEPTION to Section 180.2(a)2: Light and heavy mass walls
EXCEPTION to Section 180.2(b)1Ai: The aged solar reflectance requirement can be met by using insulation at the roof deck specified in TABLE 180.2-A.
Minimum Aged Solar Reflectance | Roof Deck Continuous Insulation R-value (Climate Zones 6-7) | Roof Deck Continuous Insulation R-value (Climate Zones 2, 4, 8-15) |
0.60 | 2 | 16 |
0.55 | 4 | 18 |
0.50 | 6 | 20 |
0.45 | 8 | 22 |
No requirement | 10 | 24 |
EXCEPTION TO SECTION 180.2(b)1Aii: The following shall be considered equivalent to Subsection ii:
EXCEPTION 1 to Sections 180.2(b)1Ai and ii: Roof area covered by building integrated photovoltaic panels and building integrated solar thermal panels are not required to meet the minimum requirements for solar reflectance, thermal emittance, or SRI.
EXCEPTION 2 to Sections 180.2(b)1Ai and ii: Roof constructions with a weight of at least 25lb/ft² are not required to meet the minimum requirements for solar reflectance, thermal emittance, or SRI.
EXCEPTION 1 to Section 180.2(b)1Aiii: Roof recovers with new R-10 insulation added above deck do not need to be insulated to meet R-14.
EXCEPTION 2 to Section 180.2(b)1Aiii: When existing mechanical equipment is located on the roof will not be disconnected and lifted, insulation added may be limited to the greater of R-10 or the maximum installed thickness that will allow the distance between the height of the roof membrane surface to the top of the base flashing to remain in accordance with the manufacturer’s instructions.
EXCEPTION 3 to Section 180.2(b)1Aiii: At the drains and other low points, tapered insulation with a thermal resistance less than R-14 may be used, provided that insulation thickness is increased at the high points of the roof so that the average thermal resistance equals or exceeds R-14
EXCEPTION 4 to Section 180.2(b)1Aiii: The area of the roof recoat is not required to be insulated.
EXCEPTION to Section 180.2(b)1Bia: In Climate Zones 1, 3, 4, and 9, dwelling units with at least R-19 existing insulation installed at the ceiling level.
EXCEPTION 1 to Section 180.2(b)1Bib: Dwelling units with at least R-19 existing insulation installed at the ceiling level.
EXCEPTION 2 to Section 180.2(b)1Bib: Dwelling units with atmospherically vented space heating or water heating combustion appliances located inside the pressure boundary of the dwelling unit.
EXCEPTION to Section 180.2(b)1Bic: In Climate Zones 1 through 4 and 8 through 10, dwelling units with at least R-19 existing insulation installed at the ceiling level.
EXCEPTION 1 to Section 180.2(b)1Bi: Dwelling units with at least R-38 existing insulation installed at the ceiling level.
EXCEPTION 2 to Section 180.2(b)1Bi: Dwelling units where the alteration would directly cause the disturbance of asbestos, unless the alteration is made in conjunction with asbestos abatement.
EXCEPTION 3 to Section 180.2(b)1Bi: Dwelling units with knob and tube wiring located in the vented attic.
EXCEPTION 4 to Section 180.2(b)1Bi: Where the accessible space in the attic is not large enough to accommodate the required R-value, the entire accessible space shall be filled with insulation provided such installation does not violate Section 806.3 of Title 24, Part 2.5.
EXCEPTION 5 to Section 180.2(b)1Bi: Where the attic space above the altered dwelling unit is shared with other dwelling units and the requirements of Section 180.2(b)1Bi are not triggered for the other dwelling units.
NOTE: Glass replaced in an existing sash and frame or sashes replaced in an existing frame are considered repairs. In these cases, Section 180.2(b) requires that the replacement be at least equivalent to the original in performance.
EXCEPTION 1 to Section 180.2(b)1Ci: In an alteration, where 150 square feet or less of the entire building's vertical fenestration is replaced, RSHGC and VT requirements of TABLE 180.2-B shall not apply.
EXCEPTION 1 to Section 180.2(b)1Cii: Alterations that add fenestration area of up to 50 square feet shall not be required to meet the total fenestration area requirements of Sections 170.2(a), nor the U-factor, RSHGC, and VT requirements of TABLE 180.2-B.
EXCEPTION 2 to Section 180.2(b)1Cii: Alterations that add up to 16 square feet of new skylight area per dwelling unit with a maximum U-factor of 0.55 and a maximum RSHGC of 0.30 area shall not be required to meet the total fenestration area requirements of Section 170.2(a)3.
Climate Zone
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
11
|
12
|
13
|
14
|
15
|
16
| |
Curtainwall / Storefront / Window Wall and Glazed Doors 1
|
U-factor
|
0.38
|
0.41
|
0.41
|
0.41
|
0.41
|
0.41
|
0.41
|
0.41
|
0.41
|
0.41
|
0.41
|
0.41
|
0.41
|
0.41
|
0.41
|
0.38
|
Curtainwall / Storefront / Window Wall and Glazed Doors 1
|
RSHGC
|
0.35
|
0.26
|
0.26
|
0.26
|
0.26
|
0.26
|
0.26
|
0.26
|
0.26
|
0.26
|
0.26
|
0.26
|
0.26
|
0.26
|
0.26
|
0.25
|
Curtainwall / Storefront / Window Wall and Glazed Doors 1
|
VT 2
|
0.46
|
0.46
|
0.46
|
0.46
|
0.46
|
0.46
|
0.46
|
0.46
|
0.46
|
0.46
|
0.46
|
0.46
|
0.46
|
0.46
|
0.46
|
0.46
|
NAFS 2017 Performance Class AW Window – Fixed 1
|
U-factor
|
0.38
|
0.38
|
0.38
|
0.38
|
0.38
|
0.47
|
0.47
|
0.41
|
0.41
|
0.38
|
0.38
|
0.38
|
0.38
|
0.38
|
0.38
|
0.38
|
NAFS 2017 Performance Class AW Window – Fixed 1
|
RSHGC
|
0.35
|
0.25
|
0.25
|
0.25
|
0.25
|
0.31
|
0.31
|
0.26
|
0.26
|
0.25
|
0.25
|
0.25
|
0.25
|
0.25
|
0.25
|
0.25
|
NAFS 2017 Performance Class AW Window – Fixed 1
|
VT 2
|
0.37
|
0.37
|
0.37
|
0.37
|
0.37
|
0.37
|
0.37
|
0.37
|
0.37
|
0.37
|
0.37
|
0.37
|
0.37
|
0.37
|
0.37
|
0.37
|
NAFS 2017 Performance Class AW Window – Operable 1
|
U-factor
|
0.43
|
0.43
|
0.43
|
0.43
|
0.43
|
0.47
|
0.47
|
0.43
|
0.43
|
0.43
|
0.43
|
0.43
|
0.43
|
0.43
|
0.43
|
0.43
|
NAFS 2017 Performance Class AW Window – Operable 1
|
RSHGC
|
0.35
|
0.24
|
0.24
|
0.24
|
0.24
|
0.31
|
0.31
|
0.24
|
0.24
|
0.24
|
0.24
|
0.24
|
0.24
|
0.24
|
0.24
|
0.24
|
NAFS 2017 Performance Class AW Window – Operable 1
|
VT 2
|
0.37
|
0.37
|
0.37
|
0.37
|
0.37
|
0.37
|
0.37
|
0.37
|
0.37
|
0.37
|
0.37
|
0.37
|
0.37
|
0.37
|
0.37
|
0.37
|
All Other Windows and Glazed Doors 1
|
U-factor
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
0.34
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
All Other Windows and Glazed Doors 1
|
RSHGC
|
0.35
|
0.23
|
0.23
|
0.23
|
0.23
|
0.23
|
0.23
|
0.23
|
0.23
|
0.23
|
0.23
|
0.23
|
0.23
|
0.23
|
0.23
|
0.23
|
Skylights, 3 habitable stories and fewer
|
U-factor
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
Skylights, 3 habitable stories and fewer
|
RSHGC
|
NA
|
0.23
|
NA
|
0.23
|
NA
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
0.30
|
NA
|
Skylights, 4 habitable stories and greater
|
U-factor
|
0.46
|
0.46
|
0.46
|
0.46
|
0.46
|
0.46
|
0.46
|
0.46
|
0.46
|
0.46
|
0.46
|
0.46
|
0.46
|
0.46
|
0.46
|
0.46
|
Skylights, 4 habitable stories and greater
|
RSHGC
|
0.35
|
0.25
|
0.25
|
0.25
|
0.25
|
0.25
|
0.25
|
0.25
|
0.25
|
0.25
|
0.25
|
0.25
|
0.25
|
0.25
|
0.25
|
0.25
|
Skylights, 4 habitable stories and greater
|
VT 2
|
0.49
|
.49
|
.49
|
0.49
|
0.49
|
0.49
|
0.49
|
0.49
|
0.49
|
0.49
|
0.49
|
0.49
|
0.49
|
0.49
|
0.49
|
0.49
|
Footnotes to TABLE 180.2-B
| |||||||||||||||||
1. For fenestration installed in buildings with three or fewer habitable stories, there is no SHGC requirement in Climate Zones 1, 3, 5, and 16.
| |||||||||||||||||
2. Minimum VT requirements to not apply to multifamily buildings 3 habitable stories or less
|
Climate Zone | 3, 5 through 7 | 1, 2, 4, 8 through 16 |
Duct R-Value | R-6 | R-8 |
Entirely new or complete replacement duct systems installed as part of an alteration are constructed of at least 75 percent new duct material, and up to 25 percent may consist of reused parts from the dwelling unit's existing duct system, including but not limited to registers, grilles, boots, air handler, coil, plenums, duct material; if the reused parts are accessible and can be sealed to prevent leakage.
Entirely new or complete replacement duct systems shall also conform to the requirements of Sections 160.2(a)1 and 160.3(b)5L. If the air handler and ducts are located within a vented attic, the requirements of Section 180.2(b)1Bi shall also be met.
EXCEPTION to Section 180.2(b)2AiiaII: Duct Sealing. Existing duct systems that are extended, which are constructed, insulated or sealed with asbestos.
EXCEPTION 1 to 180.2(b)2Aii: The HERS Rater field verification and HERS Provider data registry requirements of Reference Residential Appendix RA2 and RA3 are not required for multifamily dwelling units in buildings four stories and greater. The installer shall certify that diagnostic testing was performed in accordance with the applicable procedures.
EXCEPTION 1 to Section 180.2(b)2Aiii: Duct Sealing. Duct systems that are documented to have been previously sealed as confirmed through field verification and diagnostic testing in accordance with procedures in the Reference Residential Appendix RA3.1.
EXCEPTION 2 to Section 180.2(b)2Aiii: Duct Sealing. Duct systems with less than 40 linear feet as determined by visual inspection.
EXCEPTION 3 to Section 180.2(b)2Aiii: Duct Sealing. Existing duct systems constructed, insulated or sealed with asbestos.
EXCEPTION 4 to Section 180.2(b)2Aiii: The HERS Rater field verification and HERS Provider data registry requirements of Reference Residential Appendix RA2 and RA3 are not required for multifamily dwelling units in buildings four stories and greater. The installer shall certify that diagnostic testing was performed in accordance with the applicable procedures.
EXCEPTION to Section 180.2(b)2Aivb: Entirely new or complete replacement packaged systems for which the manufacturer has verified correct system refrigerant charge prior to shipment from the factory are not required to have refrigerant charge confirmed through field verification and diagnostic testing. The installer of these packaged systems shall certify that the packaged system was pre-charged at the factory and has not been altered in a way that would affect the charge. Ducted systems shall comply with minimum system airflow rate requirement in Section 180.2(b)2AivbI, provided that the system is of a type that can be verified using the procedure specified in RA3.3 or an approved alternative in RA1.
EXCEPTION 1 to Section 180.2(b)2AivbI: Systems unable to comply with the minimum airflow rate requirement shall demonstrate compliance using the procedures in RA3.3.3.1.5; and the system's thermostat shall conform to the specifications in Section 110.12.
EXCEPTION 2 to Section 180.2(b)2AivbI: Entirely new or complete replacement space conditioning systems, as specified by Section 180.2(b)2Ai, without zoning dampers may comply with the minimum airflow rate by meeting the applicable requirements in TABLE 160.3-A or 160.3-B as confirmed by field verification and diagnostic testing in accordance with the procedures in Reference Residential Appendix RA3.1.4.4 and RA3.1.4.5. The design clean-filter pressure drop requirements of Section 160.2(a)1C for the system air filter device(s) shall conform to the requirements given in TABLES 160.3-A and 160.3-B.
EXCEPTION 1 to Section 180.2(b)2AivbII: When the outdoor temperature is less than 55 degrees F and the installer utilizes the weigh-in charging procedure in Reference Residential Appendix RA3.2.3.1 to demonstrate compliance, the installer may elect to utilize the HERS Rater verification procedure in Reference Residential Appendix Section RA3.2.3.2. If the HERS Rater verification procedure in Section RA3.2.3.2 is used for compliance, the system's thermostat shall conform to the specifications in Section 110.12. Ducted systems shall comply with the minimum system airflow rate requirements in Section 180.2(b)2AivbI.
EXCEPTION 2 to Section 180.2(b)2Aivb: The HERS Rater field verification and HERS Provider data registry requirements of Reference Residential Appendix RA2 and RA3 are not required for multifamily dwelling units in buildings four stories and greater. The installer shall certify that diagnostic testing was performed in accordance with the applicable procedures.
EXCEPTION 1 to Section 180.2(b)2Av: Non-ducted electric resistance space heating systems, if the existing space heating system is electric resistance.
EXCEPTION 2 to Section 180.2(b)2Av: Ducted electric resistance space heating systems, if the existing space heating system is electric resistance and a ducted space cooling system is not being replaced or installed.
EXCEPTION 3 to Section 180.2(b)2Av: Electric resistance space heating systems, if the existing space heating system is electric resistance in Climate Zones 6, 7, 8, or 15.
EXCEPTION 1 to Section 180.2(b)2Bi. Section 180.2(b)2Av does not apply to replacement of electric reheat of equivalent or lower capacity electric resistance space heaters, when natural gas is not available.
EXCEPTION 2 to Section 180.2(b)2Bi. Section 170.2(c)4L is not applicable to new or replacement space conditioning systems.
EXCEPTION 3 to Section 180.2(b)2Bi: Section 170.2(c)4Ci is applicable to systems, other than single package air-cooled commercial unitary air conditioners and heat pumps, with cooling capacity less than 54,000 Btu/h.
Airflow | Multi-Zone VAV Systems 1 ≤5,000 cfm | Multi-Zone VAV Systems 1 >5,000 and ≤10,000 cfm | Multi-Zone VAV Systems 1 >10,000 cfm | All Other Fan Systems ≤5,000 cfm | All Other Fan Systems >5,000 and ≤10,000 cfm | All Other Fan Systems >10,000 cfm |
Supply Fan System Additional Allowance | 0.135 | 0.114 | 0.105 | 0.139 | 0.12 | 0.107 |
Supply Fan System Additional Allowance In Unit with Adapter Curb | 0.033 | 0.033 | 0.043 | 0.000 | 0.000 | 0.000 |
Exhaust/ Relief/ Return/ Transfer Fan System Additional Allowance | 0.07 | 0.061 | 0.054 | 0.07 | 0.062 | 0.055 |
Exhaust/ Relief/ Return/ Transfer Fan System Additional Allowance In Unit with Adapter Curb | 0.016 | 0.017 | 0.022 | 0.000 | 0.000 | 0.000 |
Footnotes to Table 180.2-D: 1. See FAN SYSTEM, MULTI-ZONE VARIABLE AIR VOLUME (VAV) for the definition of a Multi-Zone VAV System. |
EXCEPTION 1 to Section 180.2(b)2Biib: When it is not possible to achieve the duct leakage criteria in Section 180.2(b)2Biib, all accessible leaks shall be sealed and verified through a visual inspection and a smoke test performed by a certified HERS Rater utilizing the methods specified in Reference Nonresidential Appendix NA2.1.4.2.2a.
EXCEPTION 2 to Section 180.2(b)2Biib: Duct Sealing. Existing duct systems that are extended, which are constructed, insulated or sealed with asbestos are exempt from the requirements of subsection 180.2(b)2Biib.
-
The duct system provides conditioned air to an occupiable space for a constant volume, single zone, space-conditioning system; and
-
The space conditioning system serves less than 5,000 square feet of conditioned floor area; and
-
The combined surface area of the ducts located in the following spaces is more than 25 percent of the total surface area of the entire duct system:
-
Outdoors;
-
In a space directly under a roof that
-
Has a U-factor greater than the U-factor of the ceiling, or if the roof does not meet the requirements of Section 170.2(a)1B, or
-
Has fixed vents or openings to the outside or unconditioned spaces; or
-
In an unconditioned crawlspace; or
-
In other unconditioned spaces. spaces.
-
EXCEPTION 1 to Section 180.2(b)2Biiib: Duct Sealing. Buildings altered so that the duct system no longer meets the criteria of Section 170.2(c)4Ji are exempt from the requirements of Subsection 180.2(b)2Biiib.
EXCEPTION 2 to Section 180.2(b)2Biiib: Duct Sealing. Duct systems that are documented to have been previously sealed as confirmed through field verification and diagnostic testing in accordance with procedures in the Reference Nonresidential Appendix NA2 are exempt from the requirements of Subsection 180.2(b)2Biiib.
EXCEPTION 3 to Section 180.2(b)2Biiib: Duct Sealing. Existing duct systems constructed, insulated or sealed with asbestos are exempt from the requirements of Subsection 180.2(b)2Biiib.
Alterations to indoor lighting systems shall not prevent the operation of existing, unaltered controls, and shall not alter controls to remove functions specified in Section 160.5(b)4Cv.
Alterations to lighting wiring are considered alterations to the lighting system. Alterations to indoor lighting systems are not required to separate existing general, floor, wall, display, or decorative lighting on shared circuits or controls. New or completely replaced lighting circuits shall comply with the control separation requirements of Sections 160.5(b)4Aiv and 160.5(b)4Cid.
EXCEPTION 1 to Section 180.2(b)4Biv: Alteration of portable luminaires, luminaires affixed to moveable partitions, or lighting excluded as specified in Section 170.2(e)2C.
EXCEPTION 2 to Section 180.2(b)4Biv: Any enclosed space with only one luminaire.
EXCEPTION 3 to Section 180.2(b)4Biv: Any alteration that would directly cause the disturbance of asbestos, unless the alteration is made in conjunction with asbestos abatement.
EXCEPTION 4 to Section 180.2(b)4Biv: Acceptance testing requirements of Section 160.5(e) are not required for alterations where lighting controls are added to control 20 or fewer luminaires.
EXCEPTION 5 to Section 180.2(b)4Biv: Any alteration limited to adding lighting controls or replacing lamps, ballasts, or drivers.
EXCEPTION 6 to Section 180.2(b)4Biv: One-for-one luminaire alteration of up to 50 luminaires either per complete floor of the building or per complete tenant space, per annum.
EXCEPTION to Section 180.2(b)4Bvb. Alterations where less than 5 existing luminaires are replaced.
EXCEPTION 1 to Section 180.2(b)4Bvc: Alterations where the replacement luminaires have at least 40 percent lower power consumption compared to the original luminaires are not required to comply with the lighting power allowances of Section 170.2(e)6.
EXCEPTION 2 to Section 180.2(b)4Bvc: Alterations where less than 5 existing luminaires are replaced.
EXCEPTION 3 to Section180.2(b)4Bv: Acceptance testing requirements of Section 160.5(e) are not required for alterations where controls are added to 20 or fewer luminaires.
EXCEPTION to Section 180.2(b)4Bvi: Replacement of parts of an existing sign, including replacing lamps, the sign face or ballasts, that do not require rewiring or that are done at a time other than when the sign is relocated, is not an alteration subject to the requirements of Section 180.2(b)4Bvi.
EXCEPTION to Section 180.2(b) 4Bviic: Voltage drop permitted by California Electrical Code Sections 647.4, 695.6 and 695.7.
Control Specifications
|
Projects complying with Section 180.2(b)4Biva
|
Projects complying with Sections 180.2(b)4Bivb or 180.2(b)4Bivc
|
Manual Area Controls 160.5(b)4Ai
|
Required
|
Required
|
Manual Area Controls 160.5(b)4Ai
|
Required
|
Required
|
Manual Area Controls 160.5(b)4Ai
|
Only required for new or completely replaced circuits
|
Only required for new or completely replaced circuits
|
Multi-Level Controls 160.5(b)4B
|
Required
|
Not Required
|
Automatic Shut Off Controls 160.5(b)4Ci
|
Required; 160.5(b)4Cid only required for new or completely replaced circuits
|
Required; 160.5(b)4Cid only required for new or completely replaced circuits
|
Automatic Shut Off Controls 160.5(b)4Cii
|
Required
|
Required
|
Automatic Shut Off Controls 160.5(b)4Cii
|
Required
|
Required
|
Automatic Shut Off Controls 160.5(b)4Civ
|
Required
|
Required
|
Automatic Shut Off Controls 160.5(b)4Cv
|
Required
|
Required
|
Automatic Shut Off Controls 160.5(b)4Cvi
|
Required
|
Required
|
Automatic Shut Off Controls 160.5(b)4Cvii
|
Required
|
Required
|
Daylighting Controls 160.5(b)4D
|
Required
|
Not Required
|
Demand Responsive Controls 160.5(b)4E
|
Required
|
Not Required
|
EXCEPTION 1 to Section 180.2(c): Any dual-glazed greenhouse or garden window installed as part of an alteration complies with the U-factor requirements in Section 170.2.
EXCEPTION 2 to Section 180.2(c): Where the space in the attic or rafter area is not large enough to accommodate the required R-value, the entire space shall be filled with insulation provided such installation does not violate Section 1203.2 of Title 24, Part 2.
NOTE: Authority: Sections 25213, 25218, 25218.5, 25402 and 25402.1, Public Resources Code. Reference: Sections 25007, 25008, 25218.5, 25310, 25402, 25402.1, 25402.4, 25402.5, 25402.8, and 25943, Public Resources Code.