The crrc rates roofing products and systems by measuring two important thermal properties.
Roof tile title 24 aged solar reflectance zone 9.
The los angeles green building code reflectivity requirement for a residential asphalt shingle is a minimum 3 year aged solar reflectance of 0 20 a minimum thermal emittance of 0 75 or a sri solar reflectance index of 16.
Title 24 also rates sr after 3 years a value known as aged solar reflectance.
In our example we are using tile roofing with a weight greater than 5 lb sq.
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 following cool roof rating council crrc website can be used to identify.
Environmental protection agency s epa s energy star program california s title 24 and the leadership in energy and environmental design leed rating system qualify a cool roof in terms of solar reflectance sr and thermal emittance te or solar reflective index sri.
A cool color is defined as any product with an aged solar reflective index sri of 16 or greater actual or calculated.
Cool roof shingles roofing products with high solar reflectance and thermal emittance are referred to as cool roof which is the outer layer or exterior surface of a roof.
Low slope cool roof minimum aged solar reflectance remains unchanged at 0 63 for new construction and alterations or solar reflectance index sri of 75 in all climate zones.
2019 california title 24 building energy efficiency standards for retail spaces.
Cool roofs consist of materials that reflect the sun s energy from the roof surface as well as have high emissivity allowing them to emit infrared energy.
A comparison between the way u s.
If your project meets one of the following conditions you can use any profile in any color on the roof.
Overview of the ca title 24 standards.
Effective july 1 2014 the title 24 roofing code establishes new requirements to promote the installation of cool roofs in low rise residential steep slope construction.
On a steep slope roof greater than 2 12 and for climate zone 8 the cool roof requirements are an aged solar reflectance of 0 15 and a thermal emittance of 0 75.
The roofing material s ability to reflect solar energy back into the atmosphere.
Aged solar reflectance index of 20 or a minimum sri a sri of 16 requirements vary by zone depending on the building and the climate method.
To see which climate zone your project is in and the requirements associated with your building structure visit the cec s website.
