Title 24 · California Energy Code
Prescriptive envelope criteria (U‑factors, R‑values, fenestration limits)
This hub explains where Title 24, Part 6 lists prescriptive envelope U‑factors, R‑values and fenestration limits and which sections/tables to use for each occupancy.
Last reviewed: July 6, 2026
Overview
This part of the California Energy Code (Title 24, Part 6) contains the prescriptive envelope requirements — the maximum assembly U‑factors and/or minimum insulation R‑values for roofs, walls, floors, and doors, and the area‑weighted fenestration limits (U‑factor, SHGC/RSHGC, visible transmittance and maximum window‑to‑wall/window‑to‑floor ratios) used for the prescriptive compliance path. For single‑family residential buildings see the residential prescriptive tables and fenestration rules in §150.1(c) and Table 150.1‑A; those area‑weighted fenestration limits and WWR caps are spelled out in the residential tables and accompanying notes.
Nonresidential and hotel/motel prescriptive envelope packages and daylighting/fenestration options are in Chapter 140 (see §140.3 and the prescriptive tables such as Tables 140.3‑B, C and D), while multifamily, additions and alterations have related prescriptive criteria in §170.2 and §180.2. The Code lets you demonstrate compliance either by meeting the listed assembly U‑factors or by installing the specified R‑values (and provides trade‑off and reference appendix methods, e.g., JA4, when alternate assemblies are used).
Because these values drive the building’s heat transfer and often determine HVAC sizing, they are also subjects of inspection and labeling requirements identified elsewhere in Title 24 (for example, inspection items include envelope insulation R‑ and U‑values and fenestration U‑factors). Use the applicable table by occupancy and climate zone and follow the area‑weighted and NFRC/default rating methods referenced in §110.6 when calculating compliance.
In this section
Code references
Grounded in the retrieved California Energy Code — click a citation to read the verbatim passage:
§ 140.3 High relevance — show source text
TABLE 140.3-D—PRESCRIPTIVE ENVELOPE CRITERIA FOR RELOCATABLE PUBLIC SCHOOL BUILDINGS FOR USE IN ALL CLIMATE ZONES Col2 Col3 ENVELOPE FEATURE CRITERIA VALUE Roofs and Ceilings – Metal Buildings Maximum U-factor 0.038 Roofs and Ceilings – Nonmetal Buildings Maximum U-factor 0.028 Walls – Wood-framed buildings Maximum U-factor 0.038 Walls – Metal-framed buildings Maximum U-factor 0.055 Walls – Metal buildings Maximum U-factor 0.053 Walls – Mass/7.0 ≤ HC Maximum U-factor 0.138 Walls – All Other Walls Maximum U-factor 0.038 Floors and Soffits – Raised Mass Maximum U-factor 0.058 Floors and Soffits – Other Maximum U-factor 0.039 Roofing Products – Low-Sloped Aged Solar Reflectance 0.63 Roofing Products – Low-Sloped Thermal Emittance 0.75 Roofing Products – Steep-Sloped Aged Solar Reflectance 0.25 Roofing Products – Steep-Sloped Thermal Emittance 0.80 Fenestration – Fixed Windows Maximum U-factor 0.34 Fenestration – Fixed Windows Maximum RSHGC 0.22 Fenestration – Fixed Windows Minimum VT 0.42 Fenestration – Operable Windows Maximum U-factor 0.46 Fenestration – Operable Windows Maximum RSHGC 0.22 Fenestration – Operable Windows Minimum VT 0.32 Fenestration – Glazed Doors
(Site-Built and Factory Assembled)Maximum U-factor 0.45 Fenestration – Glazed Doors
(Site-Built and Factory Assembled)Maximum RSHGC 0.23 Fenestration – Glazed Doors
(Site-Built and Factory Assembled)Minimum VT 0.17 Fenestration – Skylights Maximum U-factor See Table 140.3-B Fenestration – Skylights Maximum RSHGC See Table 140.3-B Fenestration – Skylights Minimum VT See Table 140.3-B Fenestration – Skylights Maximum SRR 5% Exterior Doors – Non-Swinging doors Maximum U-factor 0.50 Exterior Doors – Swinging doors Maximum U-factor 0.70 (b) Reserved.
(c) Minimum daylighting requirement for large enclosed spaces. In climate zones 2 through 15, conditioned enclosed spaces, and unconditioned enclosed spaces that are greater than 5,000 square feet and that are directly under a roof with ceiling heights greater than 15 feet, shall meet the following requirements:
- A combined total of at least 75 percent of the floor area, as determined in building floor plan (drawings) view, shall be within one or more of the following: A. Primary sidelit daylit zone in accordance with Section 130.1(d), or B. The total floor area in the space within a horizontal distance of 0.7 times the average ceiling height from the edge of rough opening of skylights.
§ 180.1 High relevance — show source text
Exception 7 to Section 180.1 : Dwelling unit space heating system. New or replacement space heating systems serving an addition may be a heat pump or gas heating system.
(a) Prescriptive approach. The envelope and lighting of the addition; any newly installed space-conditioning or ventilation system, electrical power distribution system, or water-heating system; any addition to an outdoor lighting system; and any new sign installed in conjunction with an indoor or outdoor addition shall meet the applicable requirements of Sections 110.0 through 110.12; 160.0, 160.1, and 160.2(c) and (d); and 160.3 through 170.2.
- Envelope. A. Additions that are greater than 700 square feet shall meet the requirements of Section 170.2(a), with the following modifications:
i. Framed walls extension. Extensions of existing wood-framed walls may retain the dimensions of the existing walls and shall install cavity insulation of R-15 in a 2x4 framing and R-21 in a 2x6 framing. ii. The maximum allowed fenestration area shall be the greater of 175 square feet or 20 percent of the addition floor area.
iii. When existing siding of a wood-framed wall is not being removed or replaced, cavity insulation of R-15 in a 2x4 framing and R-21 in a 2x6 framing shall be installed and continuous insulation is not required. iv. Additions that consist of the conversion of existing spaces from unconditioned to conditioned space shall not be required to perform the air sealing part of QII when the existing air barrier is not being removed or replaced. B. Additions that are 700 square feet or less shall meet the requirements of Section 170.2(a), with the following modifications.
i. Roof and ceiling insulation in a ventilated attic shall meet one of the following requirements: a. In Climate Zones 1, 2, 4, and 8 through 16, achieve an overall assembly U -factor not exceeding 0.025. In wood framed assemblies, compliance with U -factors may be demonstrated by installing insulation with an R -value of R-38 or greater.
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b. In Climate Zones 3 and 5 through 7, achieve an overall assembly U- factor not exceeding 0.031. In wood framed assemblies, compliance with U- factors may be demonstrated by installing insulation with an R- value of R-30 or greater. ii. Radiant barrier. For buildings three habitable stories or less, radiant barriers shall be installed in attics with exposed attic deck undersides in Climate Zones 2–15. iii. Extensions of existing wood-framed walls may retain the dimensions of the existing walls and shall install cavity insulation of R-15 in a 2x4 framing and R-21 in a 2x6 framing; and iv. Fenestration products must meet the U- factor, RSGHC and VT requirements of Table 180.2-B. v. Quality insulation installation (QII) requirements of Section 170.2(a)6 do not apply. Exception to Section 180.1(a)1B: Insulation in an enclosed rafter ceiling shall meet the requirements of Section 160.1(a).
§ 100.1 High relevance — show source text
As defined in Section 100.1, light mass walls are walls with a heat capacity of at least 7.0 Btu/ft2-°F and less than 15.0 Btu/ft2-°F. Heavy mass walls are walls with a heat capacity
of at least 15.0 Btu/ft2-°F.
2. Glazed doors applies to both site-built and to factory-assembled glazed doors.|Notes:
1. As defined in Section 100.1, light mass walls are walls with a heat capacity of at least 7.0 Btu/ft2-°F and less than 15.0 Btu/ft2-°F. Heavy mass walls are walls with a heat capacity
of at least 15.0 Btu/ft2-°F.
2. Glazed doors applies to both site-built and to factory-assembled glazed doors.|Notes:
1. As defined in Section 100.1, light mass walls are walls with a heat capacity of at least 7.0 Btu/ft2-°F and less than 15.0 Btu/ft2-°F. Heavy mass walls are walls with a heat capacity
of at least 15.0 Btu/ft2-°F.
2. Glazed doors applies to both site-built and to factory-assembled glazed doors.|2025 CALIFORNIA ENERGY CODE 111
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TABLE 140.3-D—PRESCRIPTIVE ENVELOPE CRITERIA FOR RELOCATABLE PUBLIC SCHOOL BUILDINGS FOR USE IN ALL CLIMATE ZONES Col2 Col3 ENVELOPE FEATURE CRITERIA VALUE Roofs and Ceilings – Metal Buildings Maximum U-factor 0.038 Roofs and Ceilings – Nonmetal Buildings Maximum U-factor 0.028 Walls – Wood-framed buildings Maximum U-factor 0.038 Walls – Metal-framed buildings Maximum U-factor 0.055 Walls – Metal buildings Maximum U-factor 0.053 Walls – Mass/7.0 ≤ HC Maximum U-factor 0.138 Walls – All Other Walls Maximum U-factor 0.038 Floors and Soffits – Raised Mass Maximum U-factor 0.058 Floors and Soffits – Other Maximum U-factor 0.039 Roofing Products – Low-Sloped Aged Solar Reflectance 0.63 Roofing Products – Low-Sloped Thermal Emittance 0.75 Roofing Products – Steep-Sloped Aged Solar Reflectance 0.25 Roofing Products – Steep-Sloped Thermal Emittance 0.80 Fenestration – Fixed Windows Maximum U-factor 0.34 Fenestration – Fixed Windows Maximum RSHGC 0.22 Fenestration – Fixed Windows Minimum VT 0.42 Fenestration – Operable Windows Maximum U-factor 0.46 Fenestration – Operable Windows Maximum RSHGC 0. § 0.32 High relevance — show source text
22| |Fenestration – Operable Windows|Minimum VT|0.32| |Fenestration – Glazed Doors
(Site-Built and Factory Assembled)|Maximum U-factor|0.45| |Fenestration – Glazed Doors
(Site-Built and Factory Assembled)|Maximum RSHGC|0.23| |Fenestration – Glazed Doors
(Site-Built and Factory Assembled)|Minimum VT|0.17| |Fenestration – Skylights|Maximum U-factor|See Table 140.3-B| |Fenestration – Skylights|Maximum RSHGC|See Table 140.3-B| |Fenestration – Skylights|Minimum VT|See Table 140.3-B| |Fenestration – Skylights|Maximum SRR|5%| |Exterior Doors – Non-Swinging doors|Maximum U-factor|0.50| |Exterior Doors – Swinging doors|Maximum U-factor|0.70|(b) Reserved.
(c) Minimum daylighting requirement for large enclosed spaces. In climate zones 2 through 15, conditioned enclosed spaces, and unconditioned enclosed spaces that are greater than 5,000 square feet and that are directly under a roof with ceiling heights greater than 15 feet, shall meet the following requirements:
- A combined total of at least 75 percent of the floor area, as determined in building floor plan (drawings) view, shall be within one or more of the following: A. Primary sidelit daylit zone in accordance with Section 130.1(d), or B. The total floor area in the space within a horizontal distance of 0.7 times the average ceiling height from the edge of rough opening of skylights.
- All skylit daylit zones and primary sidelit daylit zones shall be shown on building plans.
- General lighting in daylit zones shall be controlled in accordance with Section 130.1(d).
- The total skylight area is at least 3 percent of the total floor area in the space within a horizontal distance of 0.7 times the average ceiling height from the edge of rough opening of skylights; or the product of the total skylight area and the average skylight visible transmittance is no less than 1.5 percent of the total floor area in the space within a horizontal distance of 0.7 times the average ceiling height from the edge of rough opening of skylights.
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- All skylights shall have a glazing material or diffuser that has a measured haze value greater than 90 percent, tested according to ASTM D1003 (notwithstanding its scope) or other test method approved by the Commission.
- Skylights for conditioned and unconditioned spaces shall have an area-weighted average visible transmittance (VT) no less than the applicable value required by Section 140.3(a)6D.
Exception 1 to Section 140.3(c): Auditoriums, churches, movie theaters, museums and refrigerated warehouses.
§ 4.3.1 High relevance — show source text
Use Reference Joint Appendices JA4 Table 4.3.1, 4.3.1(a), or Table 4.3.4 to determine alternative insu-
lation products to be less than or equal to the required maximum U-factor.
4. Mass wall has a heat capacity greater than or equal to 7.0 Btu/h-ft2.
5. Product must be certified to meet the North American Fenestration Standard/Specification for an Architectural Window (AW).
6. Glazed doors must meet the fenestration requirements.
7. Requirements apply to doors included in the curtain wall/storefront construction assembly.
8. If using_F_-factor to comply, use Reference Joint Appendices JA4, Table 4.4.7 to determine alternate depth and R-value to be less than or equal to the required maximum_F_-
factor.
9. Option B meets §170.2(a)1Bii.
10. Option C meets §170.2(a)1BIiii.
11. Option D meets §170.2(a)1Biv.|1. Install the specified_R_-value with an airspace present between the roofing and the roof deck. Such as standard installation of concrete or clay tile.
2._ R_-values shown for below roof deck insulation are for wood-frame construction with insulation installed between the framing members. Alternatives including insulation
above rafters or above roof deck shall comply with the performance standards.
3. Assembly_U_-factors for exterior framed walls can be met with cavity insulation alone or with continuous insulation alone, or with both cavity and continuous insulation that
results in an assembly_U_-factor equal to or less than the_U_-factor shown. Use Reference Joint Appendices JA4 Table 4.3.1, 4.3.1(a), or Table 4.3.4 to determine alternative insu-
lation products to be less than or equal to the required maximum U-factor.
4. Mass wall has a heat capacity greater than or equal to 7.0 Btu/h-ft2.
5. Product must be certified to meet the North American Fenestration Standard/Specification for an Architectural Window (AW).
6. Glazed doors must meet the fenestration requirements.
7. Requirements apply to doors included in the curtain wall/storefront construction assembly.
8. If using_F_-factor to comply, use Reference Joint Appendices JA4, Table 4.4.7 to determine alternate depth and R-value to be less than or equal to the required maximum_F_-
factor.
9. Option B meets §170.2(a)1Bii.
10. Option C meets §170.2(a)1BIiii.
11. Option D meets §170.2(a)1Biv.|242 2025 CALIFORNIA ENERGY CODE
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TABLE 170.2-B—SUPPLY FAN POWER ALLOWANCES (watts/cfm) Col2 Col3 Col4 Col5 Col6 Col7 MULTI-ZONE
VAV SYSTEMS
≤ **5,§ 0.280. Medium relevance — show source text
Spandrel panels and glass curtain walls. A minimum of R-4, or the area-weighted average U -factor of the wall assembly shall not exceed U-0.280. Exception to Section 141.0(b)1B: Light and heavy mass walls. C. Floor insulation. For the altered portion of raised floors that separate conditioned spaces from unconditioned spaces or ambient air shall meet the applicable requirements of Items 1 through 3 below:
- Raised framed floors. A minimum of R-11 insulation between framing members, or the area-weighted average U -factor of the floor assembly shall not exceed the U -factor of U-0.071.
- Raised mass floors in hotel/motel guest rooms. A minimum of R-6 insulation, or the area-weighted average U -factor of the floor assembly shall not exceed the U -factor of U-0.111.
- Raised mass floors in other occupancies. No minimum U -factor requirement. D . Fan energy index: New fan systems serving an existing building shall meet the requirements of Section 120.10. E. Exterior windows. Fenestration alterations other than repairs shall meet the following requirements:
- Vertical fenestration alterations. Where over 150 square feet of the entire building’s vertical fenestration is replaced, the maximum U -factor of the replaced units shall not exceed U-0.58.
- Added vertical fenestration. Where over 50 square feet of vertical fenestration is added, it shall meet the requirements of Section 120.7(d). Where 50 square feet or less of vertical fenestration is added, this requirement shall not apply.
- Prescriptive approach. The altered components of the envelope, or space conditioning, lighting, electrical power distribution and water heating systems, and any newly installed equipment serving the alteration, shall meet the applicable requirements of Sections 110.0 through 110.9, Sections 120.0 through 120.6, and Sections 120.9 through 130.5.
Exception to Section 141.0(b)2: The requirements of Section 120.2(i) shall not apply to alterations of spaceconditioning systems or components. A. Fenestration alterations other than repair and those subject to Section 141.0(b)2 shall meet the requirements below: i. Vertical fenestration alterations shall meet the requirements in Table 141.0-A. ii. Added vertical fenestration shall meet the requirements of Table 140.3-B, C or D. iii. All altered or newly installed skylights shall meet the requirements of Table 140.3-B, C or D. 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.
§ 0.110. Medium relevance — show source text
C. Wood framed and others. A minimum of R-11 insulation between framing members, or the area-weighted average U- factor of the wall assembly shall not exceed U-0.110. D. Spandrel panels and curtain walls. A minimum of R-4, or the area-weighted average U- factor of the wall assembly shall not exceed U-0.280.
Exception to Section 180.2(a)2: Light and heavy mass walls. 3. Floor insulation. For the altered portion of raised floors that separate conditioned spaces from unconditioned spaces or ambient air shall meet the applicable requirements of Items A and B below: A. Raised framed floors. A minimum of R-11 insulation between framing members, or the area-weighted average U- factor of the floor assembly shall not exceed U-0.071. B. Raised mass floors. A minimum of R-6 insulation, or the area-weighted average U- factor of the floor assembly shall not exceed U-0.111.
(b) Prescriptive approach. The altered component and any newly installed equipment serving the alteration shall meet the applicable requirements of Sections 110.0 through 110.9 and all applicable requirements of Sections 160.0, 160.1, 160.2(c) and (d), 160.3(a) through 160.3(b)5J, 160.3(b)6, 160.3(c) and 160.5; and
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- Envelope. A. Roof alterations . Existing roofs being replaced, recovered or recoated of a multifamily building shall meet the requirements of Section 110.8(i). For roofs with more than 50 percent of the roof area or more than 2,000 square feet of roof, whichever is less, being altered, the requirements of i through iii below apply: i. Low-sloped roofs in Climate Zones 2, 4, and 6 through 15 shall have a minimum aged solar reflectance of 0.63 and a minimum thermal emittance of 0.75, or a minimum SRI of 75. 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.
TABLE 180.2-A—ROOF/CEILING INSULATION TRADEOFF FOR LOW-SLOPED AGED SOLAR REFLECTANCE Col2 Col3 MINIMUM
AGED SOLAR REFLECTANCEROOF DECK CONTINUOUS INSULATIONR-
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 ii. Steep-sloped roofs in Climate Zones 4 and 8 through 15 shall have a minimum aged solar reflectance of 0.20 and a minimum thermal emittance of 0.75, or a minimum SRI of 16.
§ 140.3 Medium relevance — show source text
- Interior and exterior horizontal slats. To qualify for a PAF, horizontal slats shall meet the following requirements: A. Shall be installed adjacent to vertical fenestration on east- or west-facing facades with Window Wall Ratios between 20 and 30 percent. B. Exterior horizontal slats shall be level or sloped downwards from fenestration. Interior horizontal slats shall be level or sloped upwards from fenestration. C. Shall have a projection factor as specified in Table 140.3-E. The projection factor is calculated using Equation 140.3-C. D. Shall have a minimum distance factor of 0.3. The distance factor is calculated using Equation 140.3-C. Exception to Section 140.3(d)2D: Where it is documented that existing adjacent structures or natural objects within view of the vertical fenestration block direct sunlight onto the vertical fenestration between 8 a.m. and 5 p.m. for less than 500 daytime hours per year. E. Shall have a minimum Visible Reflectance of 0.50 when tested as specified in ASTM E903. F. Shall be opaque. Exception to Section 140.3(d)2F: Horizontal slats with a Visible Transmittance of 0.03 or less when tested as specified in ASTM E1175.
G. Shall be permanently mounted and not adjustable. H. Shall extend the entire height of the vertical fenestration and beyond each side of the window jamb by a distance equal to or greater than their horizontal projection. Exception to Section 140.3(d)2H: Where the slats are located entirely within the vertical fenestration’s rough opening or a fin is located at the window jambs and extends vertically the entire height of the window jamb and extends horizontally the entire depth of the projection. I. Shall be shown on the plans with the dimensions for the slat projection and slat spacing as specified in Equation 140.3-C. J. Shall have a conspicuous factory installed label permanently affixed and prominently located on an attachment point of the device to the building envelope, stating the following: “NOTICE: Removal of this device will require re-submittal of compliance documentation to the enforcement agency responsible for compliance with California Title 24, Part 6”. 3. Interior and Exterior Light Shelves. To qualify for a PAF, light shelves shall meet the following requirements: A. Where there is vertical fenestration area below the light shelf, both interior and exterior light shelves shall be installed. B. Shall be installed adjacent to clerestory fenestration on south-facing facades with Window Wall Ratios greater than 30 percent. The head height of the light shelves shall be no more than one foot below the finished ceiling. The clerestory fenestration shall meet the requirements of Section 140.3(d)1. C. Exterior light shelves shall be level or sloped downwards from fenestration. Interior light shelves shall be level or sloped upwards from fenestration.
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D. Shall have a projection factor of the applicable value as specified in Table 140.3-E. The light shelf projection factor is calculated using Equation 140.3-C.
§ 15.0 Medium relevance — show source text
Heavy mass walls are walls with a heat capac-
ity of at least 15.0 Btu/ft2-°F.|Note:
1. As defined in Section 100.1, light mass walls are walls with a heat capacity of at least 7.0 Btu/ft2-°F and less than 15.0 Btu/ft2-°F. Heavy mass walls are walls with a heat capac-
ity of at least 15.0 Btu/ft2-°F.|Note:
1. As defined in Section 100.1, light mass walls are walls with a heat capacity of at least 7.0 Btu/ft2-°F and less than 15.0 Btu/ft2-°F. Heavy mass walls are walls with a heat capac-
ity of at least 15.0 Btu/ft2-°F.|Note:
1. As defined in Section 100.1, light mass walls are walls with a heat capacity of at least 7.0 Btu/ft2-°F and less than 15.0 Btu/ft2-°F. Heavy mass walls are walls with a heat capac-
ity of at least 15.0 Btu/ft2-°F.|110 2025 CALIFORNIA ENERGY CODE
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TABLE 140.3-C —PRESCRIPTIVE ENVELOPE CRITERIA FOR GUEST ROOMS OF HOTEL/MOTEL BUILDINGS Col2 Col3 Col4 Col5 Col6 Col7 Col8 Col9 Col10 Col11 Col12 Col13 Col14 Col15 Col16 Col17 ENVELOPE FEATURE CZ 1 CZ 2 CZ 3 CZ 4 CZ 5 CZ 6 CZ 7 CZ 8 CZ 9 CZ 10 CZ 11 CZ 12 CZ 13 CZ 14 CZ 15 CZ 16 Roofs and Ceilings – Metal
Building Max U-Factor0.041 0.041 0.041 0.041 0.041 0.041 0.041 0.041 0.041 0.041 0.041 0.041 0.041 0.041 0.041 0.041 Roofs and Ceilings – Wood-
Framed and Other
Max U-Factor0.028 0.028 0.034 0.028 0.034 0.034 0.039 0.028 0.028 0.028 0.028 0.028 0.028 0.028 0.028 0.028 Walls – Metal Building
Max U-Factor0.061 0.061 0. § 0.650 Medium relevance — show source text
253|0.650|0.650|0.650|0.650|0.690|0.690|0.690|0.690|0.650|0.184|0.253|0.211|0.184|0.184|0.160| |Floors/Soffits -
Slab Perimeter8|NR|NR|NR|NR|NR|NR|NR|NR|NR|NR|NR|NR|NR|NR|NR|F 0.58
R 7.0| |Floors/Soffits –
Wood Framed|U
0.037
R 19|U
0.037
R 19|U
0.037
R 19|U
0.037
R 19|U
0.037
R 19|U
0.037
R 19|U
0.037
R 19|U
0.037
R 19|U
0.037
R 19|U
0.037
R 19|U
0.037
R 19|U
0.037
R 19|U
0.037
R 19|U
0.037
R 19|U
0.037
R 19|U
0.037
R 19|2025 CALIFORNIA ENERGY CODE 241
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TABLE 170.2-A—ENVELOPE COMPONENT PACKAGE – MULTIFAMILY STANDARD BUILDING DESIGN—continued Col2 Col3 Col4 Col5 Col6 Col7 Col8 Col9 Col10 Col11 Col12 Col13 Col14 Col15 Col16 Col17 BUILDING COMPONENT -
WALLS, FLOORS, DOORS
AND QIICZ 1 CZ 2 CZ 3 CZ 4 CZ 5 CZ 6 CZ 7 CZ 8 CZ 9 CZ 10 CZ 11 CZ 12 CZ 13 CZ 14 CZ 15 CZ 16 Floors/Soffits – Wood Framed U
0.037
R 19U
0.037
R 19U
0.037
R 19U
0.037
R 19U
0.037
R 19U
0.037
R 19U
0.037
R 19U
0.037
R 19U
0.037
R 19U
0.037
R 19U
0.037
R 19U
0.037
R 19U
0.§ 110.3.9 Medium relevance — show source text
[A] 110.3.9 Energy efficiency inspections. Inspections shall be made to determine compliance with Chapter 13 and shall include, but not be limited to, inspections for: envelope insulation R- and U-values, fenestration U-value, duct system R-value, and HVAC and water-heating equipment efficiency.
[A] 110.3.10 Other inspections. In addition to the inspections specified in Sections 110.3.1 through 110.3.9, the building official is authorized to make or require other inspections of any construction work to ascertain compliance with the provisions of this code and other laws that are enforced by the department of building safety.
[A] 110.3.11 Special inspections. For special inspections, see Chapter 17.
[A] 110.3.12 Final inspection. The final inspection shall be made after all work required by the building permit is completed.
[A] 110.3.12.1 Flood hazard documentation. If located in a flood hazard area, documentation of the elevation of the lowest floor or the elevation of dry floodproofing, if applicable, as required in Section 1612.4 shall be submitted to the building official prior to the final inspection.
110.3.12.2 [HCD 1] Operation and maintenance manual. At the time of final inspection, a manual, compact disc, web-based reference or other media acceptable to the enforcing agency shall be placed in the building in accordance with the California Green Building Standards Code (CALGreen), Chapter 4, Division 4.4.
[A] 110.4 Inspection agencies. The building official is authorized to accept reports of approved inspection agencies, provided that such agencies satisfy the requirements as to qualifications and reliability.
[A] 110.5 Inspection requests. It shall be the duty of the holder of the building permit or their duly authorized agent to notify the building official when work is ready for inspection. It shall be the duty of the permit holder to provide access to and means for inspections of such work that are required by this code.
[A] 110.6 Approval required. Work shall not be done beyond the point indicated in each successive inspection without first obtaining the approval of the building official. The building official, upon notification, shall make the requested inspections and shall either indicate the portion of the construction that is satisfactory as completed, or notify the permit holder or the permit holder’s agent wherein the same fails to comply with this code. Any portions that do not comply shall be corrected and such portion shall not be covered or concealed until authorized by the building official.
1-32 2025 CALIFORNIA BUILDING CODE
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
ADMINISTRATION
SECTION 111—CERTIFICATE OF OCCUPANCY
[A] 111.1 Change of occupancy. A building or structure shall not be used or occupied in whole or in part, and a change of occupancy of a building or structure or portion thereof shall not be made, until the building official has issued a certificate of occupancy therefor as provided herein. Issuance of a certificate of occupancy shall not be construed as an approval of a violation of the provisions of this code or of other ordinances of the jurisdiction. Certificates presuming to give authority to violate or cancel the provisions of this code or other ordinances of the jurisdiction shall not be valid.
Exception: Certificates of occupancy are not required for work exempt from permits in accordance with Section 105.2.
§ 204.4.6 Medium relevance — show source text
A6.204.4.6 Commissioning report. The CxA shall create a complete report of commissioning process activities undertaken through the design, construction and postconstruction phases of the building project and provided to the owner.
A6.204.6 Building orientation and shading. Locate orient and shade the building as required in Section A6.106.9.
SECTION A6.205 [OSHPD 1 & 4]—BUILDING ENVELOPE
A6.205.1 Fenestration products and exterior doors.
A6.205.1.1 Certification of fenestration products and exterior doors other than field-fabricated. Any fenestration product and exterior door, other than field-fabricated fenestration products and field-fabricated exterior doors, may be installed only if the manufacturer has certified to the California Energy Commission or if an independent certifying organization approved by the Commission has certified that the product complies with all of the applicable requirements of this subsection.
A6.205.1.1.1 Air leakage. Manufactured fenestration products and exterior doors shall have air infiltration rates not exceeding 0.3 cfm/ft [2] of window area, 0.3 cfm/ft [2] of door area for residential doors, 0.3 cfm/ft [2] of door area for nonresidential single doors
APPENDIX A6.1-4 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
APPENDIX A6.1 — VOLUNTARY STANDARDS FOR HEALTH FACILITIES [OSHPD 1, 2 & 4]
(swinging and sliding) and 1.0 cfm/ft [2] for nonresidential double doors (swinging), when tested according to NFRC-400 or ASTM E283 at a pressure differential of 75 pascals (or 1.57 pounds/ft [2] ), incorporated herein by reference.
A6.205.1.1.2 U -factor. A fenestration product’s U -factor shall be rated in accordance with NFRC 100 or the applicable default U -factor set forth in Table A.5.205.1-A.
Exception: If the fenestration product is a skylight or is site-built fenestration in a building covered by the nonresidential standards with less than 10,000 square feet of site-built fenestration, the default U- factor may be calculated as set forth in Reference Nonresidential Appendix NA6 of the California Energy Commission 2008 Building Energy Efficiency Standards for Residential and Nonresidential Buildings.
TABLE A.5.205.1-A—DEFAULT FENESTRATION PRODUCT U-FACTORS Col2 Col3 Col4 Col5 FRAME PRODUCT TYPE SINGLE PANE
U-FACTORDOUBLE PANE1
U-FACTORGLASS BLOCK2
U-FACTORMetal Operable 1.28 0.79 0.87 Metal Fixed 1.19 0.71 0.72 Metal Greenhouse/garden window 2.26 1.40 N.A. Metal Doors 1.25 0.77 N.
Frequently asked questions
Where do I find the residential prescriptive U‑/R‑values and fenestration limits?
Residential prescriptive values are in §150.1(c) and Table 150.1‑A (climate‑zone specific); that table lists the maximum U‑factors, maximum SHGC (or RSHGC), minimum VT and maximum total/west‑facing fenestration percentages.
Can I comply using U‑factors or R‑values — or both?
Yes. The Code allows demonstrating the required thermal performance either as an overall assembly U‑factor or by installing the specified R‑value(s). Reference Joint Appendices (for example JA4) provide conversion/trade‑off methods and alternatives when you need to show equivalence.
Do fenestration limits change by occupancy or climate zone?
Yes. Fenestration limits are grouped by occupancy type and, for residential tables, by climate zone; nonresidential tables and special occupancy tables (e.g., hotel/motel, relocatable schools) list their own criteria and exceptions. Check the table notes and the exceptions in §150.1(c), §140.3, §170.2 and §180.2 for climate‑zone and scope details.
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