Solar Reflectance Index Roof Shingles

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.

Solar reflectance index roof shingles.

Timberline hd reflector series plus shingles meet green building standards code of los angeles county for residential buildings. 2013 california building energy efficiency standards title 24 part 6 requirements. 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. 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.

The coolness of the roof is measured by two properties. The solar reflectance index or sri is a calculation using the aged solar reflectance and thermal emittance measurements of the asphalt shingles materials. See actual warranty for complete details limitations and requirements. For example a standard black asphalt shingle would have an sri in the low single digits.

The third metric used to measure the performance of cool roof coverings is called the solar reflectance index sri. Rated by the cool roof rating council crrc. Solar reflectance index sri. Shasta white color meets energy star requirements for initial solar reflectance of 0 25 and 3 year aged solar reflectance of 0 15.

The higher the sri the cooler the roof will be. The sr value is a number from 0 to 1 0. 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. 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.

This measure is calculated from the tsr and te. Incorporates both solar reflectance and thermal emissivity in a single value. Presidential shake solaris in the color autumn blend can reflect up to 18 percent of the sun s energy. 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 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. 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. It ranges from 0 to 100.

Solar reflectivity r solar reflectance index sri by color.