The Ins & Outs of California Title 24

The California Energy Commission (CEC) created regulations to reduce California’s energy consumption and provide energy efficient standards for residential and non-residential buildings. These regulations are known as Title 24. And because cool roofs save both money and energy, in October 2005 they became part of the prescriptive requirements of these regulations.

To best serve our clients; ROOFCORP has compiled this guide to understanding Title 24.

What Does Title 24 Require?

Title 24 now requires the use of cool roofing materials — materials with an initial solar reflectance of 0.70 or greater and an initial thermal emittance of 0.75 or greater (measures on a scale of 0 to 1, with one as the highest rating) — on all low-slope non-residential roofs over conditioned spaces (heated or cooled). This includes both new construction and reroofing projects on existing buildings where at least 2,000 square feet or 50% of the total area is being reroofed, whichever is less.

It should be noted that hotels and residential buildings of four stories or greater have a separate set of rules and guidelines. Also some low-slope facilities are exempt from these regulations.

What Constitutes a Cool Roof?

Products must meet the following requirements:

Products must certified by the Cool Roof Rating Council (CRRC) or another approved entity.

Product labels must list reflectance and emittance values tested in accordance with the CRRC.  The CRRC publishes manufacturer’s rating on its website at

Liquid-applied coatings must list additional physical performance properties and must be applied at a minimum thickness of 20 dry mils.

Aluminum coatings must meet ASTM D 2824 or ASTM D 6848 and be installed as specified in ASTM D 3805. Note: If you are completing a re-roofing project without any other improvements to the building’s energy efficiency, an aluminum coating will NOT comply with Title 24 minimum requirements. Aluminum coatings may only be used when using the Performance Approach, which gives only partial credit for the aluminum coating because of the low “emissivity” rating. Because it will not receive full credit, other improvements are needed so the entire building meets the required energy budget under Section 141. This virtually eliminates the use of aluminum coatings except on new construction projects that have included aluminum coatings as part of the energy budget.

Who Must Comply?  

Title 24 compliance is mandatory in California and determined by providing labels of the CRRC-rated products that are proposed when applying for a building permit. Some buildings are exempt, including:

If an existing roof on a non-residential building is BUR or modified bitumen with a rock or gravel surface, there is no removal of existing layers or installation of insulation contemplated and there is no recoating with liquid-applied coatings.

New construction tradeoffs – performance approach.


Refrigerated warehouses

Non-residential, low-slope buildings that do not use conditioning equipment to cool the building.

ROOFCORP provides Title 24 compliant materials. In business since 1985, we partner with the best vendors and manufacturers to ensure a quality product that will last for years and meet any budget.

Contact us today to learn how we can help you ensure your building project meets California’s energy efficiency requirements.

ROOFCORP OF WA, P.O. Box 69315, 3425 S 146th St., Seattle, WA., 98168
Phone: 206.439.9991 Fax: 206.439.9995
ROOFCORP OF CA, 2130 S Dupont Dr., Anaheim, CA., 92806
Phone: 714.210.5993 Fax: 714.940.9917