Residential Roofing Solar Reflectance

New technology helps to close the gap between aesthetics and solar reflectance.

Residential roofing solar reflectance.

Cool roofing is defined differently by various performance criteria in codes standards and incentive programs. These shingles must have an initial solar reflectance of at least 0 25 and a three year solar reflectance measurement of at least 0 15. Darker colors like dark brown have an average solar reflectance of 5 9 while white granules have a solar reflectance of 31 3. The most well known type of reflective surface is the cool roof.

In general a cool roof is one that has relatively high solar reflectance and high thermal emittance. As you re shopping for your new roof look for the tag or label solar reflectance. Owens corning asphalt shingle products labeled as cool are rated with the cool roofing rating council ccrc for solar reflectance and thermal emittance. All rated roofing products will have a crrc label with the efficiency values listed.

All of these types of residential roofing products are now available with ir reflective color pigments. 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. 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. Innate reflectance is measured on a scale from 0 to 1 with the latter being the highest level of reflectivity meaning it reflects 100 of all radiant energy coming in contact with it.

This is a requirement in some energy codes. As with landmark solaris gold shingles presidential solaris gold shingles are virtually identical in appearance to the same shingles without the solar reflective roofing surface. Cambridge tm cool colors reflect a percentage of solar radiation. Reflective surfaces are a form of geoengineering.

Residential roofing options include asphalt shingles metal clay tiles and concrete tiles. Many homeowners elect a balance between solar reflectance and aesthetics. 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. Reflective surfaces can deliver high solar reflectance the ability to reflect the visible infrared and ultraviolet wavelengths of the sun reducing heat transfer to the surface and high thermal emittance the ability to radiate absorbed or non reflected solar energy.

Feature gaf proprietary color blends and enhanced shadow effect for a genuine wood shake look.