Cool Roofs

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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.

Cool Roof Code Requirements

Energy Commission Cool Roof Brochure

Mandatory cool roof requirements


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


Cool Roof Diagram


Outside Links

U.S. EPA Heat Island Effect

U.S. EPA Cool Roofs

California Energy Commission Consumer Energy Center

Lawrence Berkeley Labs Heat Island Group

Global Cool Cities Alliance Cool Roof Toolkit - NEW

Coat 'N' Cool

Cool Roofs Brochure 


Links to State Resources

Title 24 Energy Hotline 
Building Energy Efficiency Standards

Cool Roof Rating Council; 866-465-252 
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


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