Los Angeles County Municipal Code § 5.106 Nonresidential Mandatory Measures

New development or alterations to existing developed sites shall comply with Chapter 12.84 of Title 12 of the Los Angeles County Code.

(Ord. 2025-0052 § 10, 2025.)

Roofing materials for conditioned and unconditioned spaces shall comply with the solar reflectance and thermal emittance requirements of this Section.

Exceptions:

Roof repair.

Roof replacement when the roof area being replaced is equal to or less than fifty (50) percent of the total roof area.

Installation of building-integrated photovoltaics.

Additions resulting in less than 500 square feet of added roof area or less than fifty (50) percent of the total roof area, whichever is greater.

Roof construction that has a thermal mass over the roof membrane, including areas of vegetated (green) roofs, weighing at least 25 pounds per square foot.

(Ord. 2025-0052 § 11, 2025.)

Roofing materials shall have a minimum 3-year aged solar reflectance equal to or greater than values specified in Table 5.106.11.

Solar reflectance values shall be based on the aged reflectance value of the roofing product or the equation in Section A5.106.11.2.1, if the CRRC testing for aged solar reflectance is not available.

(Ord. 2025-0052 § 11, 2025.)

Roofing material shall have a CRRC initial or aged thermal emittance equal to or greater than the values specified in Table 5.106.11.

(Ord. 2025-0052 § 11, 2025.)

Roofing material having a Solar Reflectance Index (SRI) equal to or greater than the values specified in Table 5.106.11 may be used as an alternative to compliance with the 3-year aged solar reflectance and thermal emittance values.

SRI values used to comply with this Section shall be calculated using the SRI Calculation Worksheet (SRI-WS) developed by the California Energy Commission or in compliance with ASTM E1980-11, as specified in the current California Energy Code. Solar reflectance values used in the SRI-WS shall be based on the aged reflectance value of the roofing product or the equation in Section A5.106.11.2.1, if the CRRC-certified aged solar reflectance is not available. Certified thermal emittance used in the SRI-WS may be either the initial value or the aged value listed by the CRRC.

Note: The Solar Reflectance Index Calculation Worksheet (SRI-WS) is available by contacting the Energy Standards Hotline at 1-800-772-3300, website at www.energy.ca.gov or by email at Title24@energy.ca.gov.

(Ord. 2025-0052 § 11, 2025.)

TABLE 5.106.11

(Ord. 2025-0052 § 12, 2025.)