Solar Reflectance Index Roof Shingles

The third metric used to measure the performance of cool roof coverings is called the solar reflectance index sri.

Solar reflectance index roof shingles.

This measure is calculated from the tsr and te. 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. For example a standard black asphalt shingle would have an sri in the low single digits. The higher the sri the cooler the roof will be.

Incorporates both solar reflectance and thermal emissivity in a single value. 2013 california building energy efficiency standards title 24 part 6 requirements. Solar reflectivity r solar reflectance index sri by color. The landmark solaris platinum solar reflective shingles represent an industry breakthrough in technology achieving a level of 40 solar reflectivity by far the highest level of reflectivity in the asphalt shingle industry.

Solar reflectance index sri. 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. See actual warranty for complete details limitations and requirements. Rated by the cool roof rating council crrc.

Solar reflectivity or reflectance is the ability of a material to reflect solar energy from its surface back into the atmosphere. Timberline hd reflector series plus shingles meet green building standards code of los angeles county for residential buildings. 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. Timberline hd reflector series plus shingles are rated by.

Feature gaf proprietary color blends and enhanced shadow effect for a genuine wood shake look. Shasta white color meets energy star requirements for initial solar reflectance of 0 25 and 3 year aged solar reflectance of 0 15. Presidential shake solaris in the color autumn blend can reflect up to 18 percent of the sun s energy. The solar reflectance index or sri is a calculation using the aged solar reflectance and thermal emittance measurements of the asphalt shingles materials.

It ranges from 0 to 100. The sr value is a number from 0 to 1 0. 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. The coolness of the roof is measured by two properties.

A value of 0 indicates that the material absorbs all solar energy and a value of 1 0 indicates total reflectance.