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.

Solar reflectance index roof shingles. 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. Solar reflectivity r solar reflectance index sri by color. Incorporates both solar reflectance and thermal emissivity in a single value.

Solar reflectance index sri. 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 ranges from 0 to 100. See actual warranty for complete details limitations and requirements.

Timberline hd reflector series plus shingles are rated by. 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. 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. The sr value is a number from 0 to 1 0.

Rated by the cool roof rating council crrc. Shasta white color meets energy star requirements for initial solar reflectance of 0 25 and 3 year aged solar reflectance of 0 15. 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.

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

The solar reflectance index or sri is a calculation using the aged solar reflectance and thermal emittance measurements of the asphalt shingles materials. Presidential shake solaris in the color autumn blend can reflect up to 18 percent of the sun s energy. The third metric used to measure the performance of cool roof coverings is called the solar reflectance index sri. 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.

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