Additions, alterations, and repairs to existing nonresidential, and hotel/motel buildings, existing outdoor lighting for these occupancies, and internally and externally illuminated signs, shall meet the requirements specified in Sections 100.0 through 110.10, and 120.0 through 130.5 that are applicable to the building project, and either the performance compliance approach (energy budgets) in Section 141.0(a)2 (for additions) or 141.0(b)3 (for alterations), or the prescriptive compliance approach in Section 141.0(a)1 (for additions) or 141.0(b)2 (for alterations), for the Climate Zone in which the building is located. Climate zones are shown in FIGURE 100.1-A.
Covered process requirements for additions, alterations and repairs to existing nonresidential, and hotel/motel buildings are specified in Section 141.1.
EXCEPTION to Section 141.0: Alterations to healthcare facilities are not required to comply with this Section.
NOTES:
- For alterations that change the occupancy classification of the building, the requirements specified in Section 141.0(b) apply to the occupancy after the alterations.
- Relocation or moving of a relocatable public school building is not, by itself, considered an alteration for the purposes of Title 24, Part 6.
EXCEPTION 1 to Section 141.0(a): When heating, cooling, or service water heating to an addition are provided by expanding existing systems, the existing systems and equipment need not comply with Sections 110.0 through 120.9, or Sections 140.4 through 140.5.
EXCEPTION 2 to Section 141.0(a): Where an existing system with electric reheat is expanded by adding variable air volume (VAV) boxes to serve an addition, total electric reheat capacity may be expanded so that the total capacity does not exceed 150 percent of the existing installed electric heating capacity in any one permit, and the system need not comply with Section 140.4(g). Additional electric reheat capacity in excess of 150 percent of the existing installed electric heating capacity may be added subject to the requirements of Section 140.4(g).
EXCEPTION 3 to Section 141.0(a): Duct Sealing. When ducts are extended from an existing duct system to serve the addition, the existing duct system and the extended ducts shall meet the applicable requirements specified in Section 141.0(b)2D.
EXCEPTION 4 to Section 141.0(a): Additions that increase the area of the roof by 2,000 square feet or less are exempt from the requirements of Section 110.10.
EXCEPTION 5 to Section 141.0(a): A gas hot water boiler system with a total system input of at least 1 MMBtu/h but no more than 10 MMBtu/h added to an existing building is exempt from the requirements of 140.4(k)8.
EXCEPTION 6 to Section 141.0(a): A gas service water heating with a total system input of at least 1 MMBtu/h added to an existing building is exempt from the requirements of 140.5(c).
EXCEPTION 7 to Section 141.0(a): Section 140.4(a)2 shall not apply to new space conditioning systems or components.
EXCEPTION to Section 141.0(b)1B: Light and heavy mass walls.
EXCEPTION to Section 141.0(b)2: The requirements of Section 120.2(i) shall not apply to alterations of space-conditioning systems or components.
EXCEPTION 1 to Section 141.0(b)2Ai: In an alteration, where 150 square feet or less of the entire building's vertical fenestration is replaced, RSHGC and VT requirements of TABLE 141.0-A shall not apply.
EXCEPTION 2 to Section 141.0(b)2Aii: In an alteration, where 50 square feet or less of vertical fenestration is added, RSHGC and VT requirements of Table 140.3-B, C or D shall not apply.
EXCEPTION 3 to Section 141.0(b)2Aiii: In an alteration, where 50 square feet or less of skylight is added, SHGC and VT requirements of Table 140.3-B, C or D shall not apply.
NOTE: Glass replaced in an existing sash and frame or sashes replaced in an existing frame are considered repairs. In these cases, Section 141.0(c) requires that the replacement be at least equivalent to the original in performance.
Climate Zone | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
U-factor | 0.47 | 0.47 | 0.58 | 0.47 | 0.58 | 0.47 | 0.47 | 0.47 | 0.47 | 0.47 | 0.47 | 0.47 | 0.47 | 0.47 | 0.47 | 0.47 |
RSHGC | 0.41 | 0.31 | 0.41 | 0.31 | 0.41 | 0.31 | 0.31 | 0.31 | 0.31 | 0.31 | 0.31 | 0.31 | 0.31 | 0.31 | 0.31 | 0.41 |
VT | See TABLE 140.3-B , C, and D for all Climate Zones |
EXCEPTION 1 to Section 141.0(b)2Bi: An aged solar reflectance less than 0.63 is allowed for low-sloped roofs provided the maximum roof/ceiling U-factor in TABLE 141.0-B is not exceeded.
EXCEPTION 2 to Sections 141.0(b)2Bi: 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 3 to Sections 141.0(b)2Bi: Roof constructions with a weight of at least 25 lb/ft² are not required to meet the minimum requirements for solar reflectance, thermal emittance, or SRI.
Aged Solar Reflectance | Climate Zones 6, 7, & 8 U-factor | All Other Climate Zones U-factor |
0.62- 0.60 | 0.043 | 0.035 |
0.59-0.55 | 0.041 | 0.034 |
0.54-0.50 | 0.038 | 0.031 |
0.49-0.45 | 0.034 | 0.029 |
0.44-0.40 | 0.032 | 0.028 |
0.39-0.35 | 0.029 | 0.026 |
0.34-0.30 | 0.028 | 0.025 |
0.29-0.25 | 0.026 | 0.024 |
EXCEPTION 1 to Section 141.0(b)2Bii: Roof recovers with new R-10 insulation added above deck do not need to be insulated to the level specified in Table 141.0-C.
EXCEPTION 2 to Section 141.0(b)2Bii: When existing mechanical equipment located on the roof will not be disconnected and lifted, insulation added is 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 141.0(b)2Bii: At the drains and other low points, tapered insulation with a thermal resistance less than that prescribed in Table 141.0-C 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 the value specified in Table 141.0-C.
EXCEPTION 4 to Section 141.0(b)2Bii: The area of the roof recoat is not required to be insulated.
Climate Zone | Continuous Insulation R-value | U-factor |
1-5, 9-16 | R-23 | 0.037, with at least R-10 above deck |
6-8 | R-17 | 0.047, with at least R-10 above deck |
EXCEPTION 1 to Section 141.0(b)2C: Section 140.4(a)2 shall not apply to new or replacement space conditioning systems or components.
EXCEPTION 2 to Section 141.0(b)2C: Subsection (b)2C does not apply to replacement of electric reheat of equivalent or lower capacity electric resistance space heaters, when natural gas is not available.
EXCEPTION 3 to Section 141.0(b)2C: Section 140.4(n) is not applicable to new or replacement space conditioning systems.
EXCEPTION 4 to Section 141.0(b)2C: Section 140.4(e) 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.
EXCEPTION 5 to Section 141.0(b)2C: A new or replacement gas hot water boiler system with a total system input of at least 1 MMBtu/h but no more than 10 MMBtu/h need not comply with the requirements of 140.4(k)8.
Airflow | Multi-Zone VAV Systems1 ≤5,000 cfm | Multi-Zone VAV Systems1 >5,000 and ≤10,000 cfm | Multi-Zone VAV Systems1 >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 141.0-D: 1. See FAN SYSTEM, MULTI-ZONE VARIABLE AIR VOLUME (VAV) in definitions for “Multi-zone” to be classified as a Multi-Zone VAV System. |
-
The duct system does not serve a healthcare facility;
-
The duct system provides conditioned air to an occupiable space for a constant volume, single zone, space-conditioning system;
-
The space conditioning system serves less than 5,000 square feet of conditioned floor area; and
-
The combined surface area of the ducts located outdoors or in unconditioned space is more than 25 percent of the total surface area of the entire duct system.
EXCEPTION 1 to Section 141.0(b)2Dii: When it is not possible to achieve the duct leakage criterion in Section 141.0(b)2Dii, then 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 NA2.1.4.2.2.
EXCEPTION 2 to Section 141.0(b)2Dii: Duct Sealing. Existing duct systems that are extended, which are constructed, insulated or sealed with asbestos are exempt from the requirements of subsection 141.0(b)2Dii.
-
For all altered units where the existing thermostat does not comply with the requirements for demand responsive controls specified in Section 110.12, the existing thermostat shall be replaced with a demand responsive thermostat that complies with Section 110.12. All newly installed space-conditioning systems requiring a thermostat shall be equipped with a demand responsive thermostat that complies with Section 110.12; and
-
The duct system that is connected to the new or replaced space-conditioning system equipment shall be sealed in accordance with Section 141.0(b)2Dii.
EXCEPTION 1 to Section 141.0(b)2Eii: Duct Sealing. Buildings altered so that the duct system no longer meets the criteria of Section 141.0(b)2Dii.
EXCEPTION 2 to Section 141.0(b)2Eii: 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.
EXCEPTION 3 to Section 141.0(b)2Eii: Duct Sealing. Existing duct systems constructed, insulated or sealed with asbestos are exempt from the requirements of Subsection 141.0(b)2Eii.
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 130.1.
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 Section 130.1(a)3 and 130.1(c)1D.
EXCEPTION 1 to Section 141.0(b)2I: Alteration of portable luminaires, luminaires affixed to moveable partitions, or lighting excluded as specified in Section 140.6(a)3.
EXCEPTION 2 to Section 141.0(b)2I: Any enclosed space with only one luminaire.
EXCEPTION 3 to Section 141.0(b)2I: Any alteration that would directly cause the disturbance of asbestos, unless the alteration is made in conjunction with asbestos abatement.
EXCEPTION 4 to Section 141.0(b)2I: Acceptance testing requirements of Section 130.4 are not required for alterations where lighting controls are added to control 20 or fewer luminaires.
EXCEPTION 5 to Section 141.0(b)2I: Any alteration limited to adding lighting controls or replacing lamps, ballasts, or drivers.
EXCEPTION 6 to Section 141.0(b)2I: 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 141.0(b)2Lii. Alterations where less than 5 existing luminaires are replaced.
EXCEPTION 1 to Section 141.0(b)2Liii: 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 140.7.
EXCEPTION 2 to Section 141.0(b)2Liii: Alterations where less than 5 existing luminaires are replaced.
EXCEPTION to Section 141.0(b)2L: Acceptance testing requirements of Section 130.4 are not required for alterations where controls are added to 20 or fewer luminaires.
EXCEPTION to Section 141.0(b)2M. 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 141.0(b)2M.
EXCEPTION to Section 141.0(b)2Piii: Voltage drop permitted by California Electrical Code Sections 647.4, 695.6 and 695.7.
EXCEPTION to Section 141.0(b)2Q: Healthcare facilities.
EXCEPTION 1 to Section 141.0(b)3A: Window Films. Applied window films installed as part of an alteration complies with the U-factor, RSHGC and VT requirements of TABLE 141.0-E.
EXCEPTION 2 to Section 141.0(b)3A: The requirements of Section 120.2(i) shall not apply to alterations of space-conditioning systems or components.
NOTES TO SECTION 141.0(b)3:
- If an existing component is replaced with a new component, that component is considered an altered component for the purpose of determining the energy budget and shall meet the requirements of Section 141.0(b)3.
- The standard design assumes the same geometry and orientation as the proposed design.
- The “existing efficiency level” modeling rules, including situations where nameplate data is not available, are described in the Nonresidential ACM Reference Manual.
EXCEPTION 1 to Section 141.0(b): 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 120.9 and Section 140.4 or 140.5.
EXCEPTION 2 to Section 141.0(b): 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 120.9 and Section 140.4 or 140.5.
EXCEPTION 3 to Section 141.0(b): 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 140.4(g). Additional electric reheat capacity in excess of 20 percent may be added subject to the requirements of the Section 140.4(g).
EXCEPTION 4 to Section 141.0(b): The requirements of Section 120.2(i) shall not apply to alterations of space-conditioning systems or components.
Standard Design Without Third Party Verification of Existing Conditions Shall be Based On | Standard Design With Third Party Verification of Existing Conditions Shall be Based On | |
Roof/Ceiling Insulation, Wall Insulation, and Floor/Soffit Insulation | The requirements of Section 141.0(b)1 and 141.0(b)2Bii. | The requirements of Section 141.0(b)1 and 141.0(b)2Bii. |
Fenestration The allowed glass area shall be the smaller of the a. or b. below: a. The proposed glass area: or b. The larger of: 1.The existing glass area that remains; or 2.The area allowed in Section 140.3(a)5A. | The U-factor and RSHGC requirements of TABLE 141.0-A. | The existing U-factor and RSHGC levels. |
Space-Conditioning System Equipment and Ducts | The requirements of Sections 141.0(b)2C, 141.0(b)2Di or Section 141.0(b)2Dii, and Section 141.0(b)2E. | The requirements of Sections 141.0(b)2C, 141.0(b)2Di or Section 141.0(b)2Dii, and Section 141.0(b)2E. |
Window Film | The U-factor of 0.40 and SHGC value of 0.35. | |
Service Water Heating Systems | The requirements of Section 140.5(c) without solar water heating requirements. | The requirements of Section 140.5(c) without solar water heating requirements. |
Roofing Products | The requirements of Section 141.0(b)2B. | The requirements of Section 141.0(b)2B. |
Lighting System | The requirements of Sections 141.0(b)2F, through 141.0(b)2K. | The requirements of Sections 141.0(b)2F, through 141.0(b)2K. |
All Other Measures | The proposed efficiency levels. | The proposed efficiency levels. |
Control Specifications
|
Projects complying with Section 141.0(b)2Ii
|
Projects complying with Sections 141.0(b)2Iii or 141.0(b)2Iiii
| |
Manual Area Controls
|
Required
|
Required
| |
Manual Area Controls
|
Required
|
Required
| |
Manual Area Controls
|
Only required for new or completely replaced circuits
|
Only required for new or completely replaced circuits
| |
Multilevel Controls
|
Required
|
Not Required
| |
Automatic Shut Off Controls
|
Required; 130.1(c)1D. only required for new or completely replaced circuits
|
Required; 130.1(c)1D. only required for new or completely replaced circuits
| |
Automatic Shut Off Controls
|
Required
|
Required
| |
Automatic Shut Off Controls
|
Required
|
Required
| |
Automatic Shut Off Controls
|
Required
|
Required
| |
Automatic Shut Off Controls
|
Required
|
Required
| |
Automatic Shut Off Controls
|
Required
|
Required; except for 130.1(c)6
| |
Automatic Shut Off Controls
|
Required
|
Required
| |
Automatic Shut Off Controls
|
Required
|
Required
| |
Daylighting Controls
|
Required
|
Not Required
| |
Demand Responsive Controls
|
Required
|
Not Required
|
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, 25910, and 25943, Public Resources Code.