What is a cool roof under Title 24?

A cool roof uses materials that reflect more sunlight and absorb less heat than a standard dark roof, keeping the roof and attic cooler and lowering cooling bills. California's Title 24 energy code sets reflectance standards that qualifying roof materials must meet, verified by an ENERGY STAR or California Cool Roofs Council label.

Do Title 24 cool-roof rules apply to my San Diego home?

As of 2026, yes, for most re-roofs. Title 24's cool-roof requirements extended to steep-slope residential replacements, so a full roof replacement in San Diego generally triggers compliance. The rule mainly guides your material and color toward reflective, cool-rated options, which a licensed roofer handles for you.

Does a tile roof already meet cool-roof standards?

Often it is close. Lighter concrete and clay tile is naturally more reflective, so many San Diego tile homeowners start ahead on cool-roof compliance. Shingle and other materials have cool-rated versions that meet the standard. A roofer confirms the specific product qualifies before installation.

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