As a contractor, you may receive questions regarding cool roofs or walls from your customers. In addition to the below information, multiple links are listed below that will guide you to additional information on the CRRC website.
In addition to saving money, other benefits of a cool roof include extending the life of the roof, lowering maintenance costs, and reducing air conditioner use.
A building with a cool roof and/or wall can significantly reduce a building’s cooling costs by lowering the need for air conditioning, especially in warmer climates. The average energy savings for a cool roof range between 7% to 15% of total cooling costs. A cool roof can also help prolong the life of an air conditioning system by reducing the strain on the system during hotter times of the day and year.
For air-conditioned buildings, cool exterior walls can reduce annual HVAC energy use in single family homes between 3% and 25%, medium offices between 0.5% and 3.7%, and stand-alone retail stores up to 9% (California Energy Commission).
Extend Roof Life
A cool roof may last longer with lower maintenance costs by blocking damaging ultraviolet (UV) rays and reducing high roof surface temperatures, both of which cause roof degradation over time.
Reduce Air Conditioner Use
A cool roof and cool exterior wall can decrease a building’s air conditioning use by reducing the amount of heat that enters into the building. In urban areas, the combination of many cool roofs can also help reduce air conditioning use by reflecting solar radiation away from buildings, which helps lower the surrounding outdoor air temperature. Therefore, with cooler daytime temperatures, buildings and vehicles use less air conditioning, which saves energy and reduces carbon dioxide emissions from electricity-generating power plants.
CRRC Rated Roof Products Directory
CRRC Rated Wall Products Directory
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Resources for Home and Building Owners
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LA Green Building Code (English)
LA Green Building Code (Spanish)
LEED Heat Island Credits for Roofs and Walls
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The standard covers test specimen preparation and test methods for measuring the initial and aged radiative properties of roofing products. The standard is referenced by building codes and rating programs worldwide in order to measure the initial and aged solar reflectance and thermal emittance of roofing products.
California’s Building Energy Efficiency Standards for Residential and Nonresidential Buildings (Title 24, Part 6) contains requirements for the thermal emittance, three-year aged reflectance, and Solar Reflectance Index (SRI) of roofing materials used in new construction and re-roofing projects.
The L.A. Green Building Code requires roofing material used in residential buildings meet minimum values for three-year aged solar reflectance and thermal emittance, or aged SRI.