Residential Roofing Solar Reflectance Index

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.

Residential roofing solar reflectance index. 06 roof pitch b. The higher the sri the cooler the roof will be. Cool asphalt roofing shingles are characterized by 3 key values. Cool roof rating council.

This system has been put into an online directory of more than 850 roofing products and is available for energy service providers building code bodies architects and specifiers property owners and community planners. By lessening the demand for energy it decreases carbon emissions that cause pollution. All rated roofing products will have a crrc label with the efficiency values listed. The solar reflectance and thermal emittance values of roofing products.

For example a standard black asphalt shingle would have an sri in the low single digits. The guide to choosing a cool roof. Only the aged solar reflectance and emittance values listed within the crrc rated products directory may be used to meet the cool roof requirements in the energy standards. Sri calculations 01 aged reflectance listed with crrc 02 crrc listed aged solar reflectance 03 initial solar reflectance 04 calculated aged solar reflectance 05 thermal emittance c.

Apart from making your life easier this metric also helps you decide more soundly to lower your utility bills and minimize your property s carbon footprints. 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. The third metric used to measure the performance of cool roof coverings is called the solar reflectance index sri. Furthermore it doesn t store as much thermal energy as an ordinary roof.

The presidential solaris series of shingles feature solar reflective roof surfaces that achieve energy star standards but in certainteed s thick rich luxury styled shake replacement shingle. When buying an energy efficient roof the solar reflectance index sri is the first thing to look for. 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. This measure is calculated from the tsr and te.

Solar reflectance thermal emittance and solar reflectance index sri. Installing a cool roof can cut your energy costs while contributing toward a better environment. Even if not required by energy codes cool asphalt roofing shingles may lower the cooling load on a home in hot climates. This may increase your home s energy efficiency and help the environment.