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.
Roof tile title 24 aged solar reflectance zone 9.
If your project meets one of the following conditions you can use any profile in any color on the 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.
The roofing material s ability to reflect solar energy back into the atmosphere.
Located in climate zones 1 9 and 16.
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 title 24 standards do not require a cool roof on a residence when energy compliance is achieved using the performance method.
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.
In our example we are using tile roofing with a weight greater than 5 lb sq.
A cool color is defined as any product with an aged solar reflective index sri of 16 or greater actual or calculated.
To see which climate zone your project is in and the requirements associated with your building structure visit the cec s website.
That is your cool roof specification for your roofing product.
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.
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.
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.
The crrc rates roofing products and systems by measuring two important thermal properties.
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 comparison between the way u s.
The following cool roof rating council crrc website can be used to identify.
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.
