California Building Energy Efficiency Standards state that replacements, recovering or recoating of the exterior surface of existing nonresidential low-sloped roofs shall meet certain requirements where more than 50 percent or more than 2,000 square feet of roof, whichever is less, is being replaced, recovered or recoated. The complete roof standards appear in the State of California's Building Energy Efficiency Standards. Non-residential standards are found in Sections 140.3 and 141. Residential standards are found in Section 150.2. New standards went into effect January 1, 2017.
In addition to true cool roof shingles, lighter colors of standard asphalt shingles are also more environmentally friendly than black shingles.
What is a Cool Roof?
A cool roof reflects and emits the sun's heat back to the sky instead of transferring it to the building below. "Coolness" is measured by two properties, Solar Reflectance and Thermal Emittance. Both properties are measured from 0 to 1, and the higher the value, the "cooler" the roof. For more information, visit the Cool Roof Rating Council’s web site at http://www.coolroofs.org/
Links to State Resources
Title 24 Energy Hotline
Building Energy Efficiency Standards
Cool Roof Rating Council
Approved Title 24 Nonresidential Compliance Software
Perform 2005: call or email Title 24 Hotline
Title 24 Website
Title 24 Energy Standards and support documents -
Energy Commission Cool Roof Website
Blueprint, the Energy Commission Newsletter on T24 Questions and Answers