Solar Reflectance Index Roof Shingles

The solar reflectance index sri is a measure of the constructed surface s ability to reflect solar heat as shown by a small temperature rise.

Solar reflectance index roof shingles.

Sri measures the roof s ability to reject solar heat defined such that a standard black reflectance 0 05 emittance 0 90 is 0 and a standard white reflectance 0 80 emittance 0 90 is 100. 2013 california building energy efficiency standards title 24 part 6 requirements. Incorporates both solar reflectance and thermal emissivity in a single value. See actual warranty for complete details limitations and requirements.

Presidential shake solaris in the color autumn blend can reflect up to 18 percent of the sun s energy. The higher the sri the cooler the roof will be. Rated by the cool roof rating council crrc. Solar reflectance sr or reflectivity or the fraction of solar energy that is reflected by the roof and thermal emittance or the relative ability of the roof surface to radiate absorbed heat or a combination of the two called the solar reflective index sri.

The solar reflectance index or sri is a calculation using the aged solar reflectance and thermal emittance measurements of the asphalt shingles materials. Solar reflectivity r solar reflectance index sri by color. Solar reflectance index sri. It ranges from 0 to 100.

Feature gaf proprietary color blends and enhanced shadow effect for a genuine wood shake look. Timberline hd reflector series plus shingles meet green building standards code of los angeles county for residential buildings. Meet the prescriptive solar reflectance and thermal emittance requirements according to the 2016 title 24 standards are rated by the cool roof rating council and meet the cool roof requirements of the los angeles green building code find out more about title 24 here. Timberline hd reflector series plus shingles can be used to comply with 2016 title 24 part 6 cool roof requirements of the california code of regulations.

For example a standard black asphalt shingle would have an sri in the low single digits. Shasta white color meets energy star requirements for initial solar reflectance of 0 25 and 3 year aged solar reflectance of 0 15. Timberline hd reflector series plus shingles are rated by. This measure is calculated from the tsr and te.

Solar reflectivity or reflectance is the ability of a material to reflect solar energy from its surface back into the atmosphere. A value of 0 indicates that the material absorbs all solar energy and a value of 1 0 indicates total reflectance. The coolness of the roof is measured by two properties. The sr value is a number from 0 to 1 0.

It is defined so that a standard black surface reflectance 0 05 emittance 0 90 is 0 and a standard white surface reflectance 0 80 emittance 0 90 is 100.