Residential Roofing Solar Reflectance

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.

Residential roofing solar reflectance.

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. All of these types of residential roofing products are now available with ir reflective color pigments. This is a requirement in some energy codes. Owens corning asphalt shingle products labeled as cool are rated with the cool roofing rating council ccrc for solar reflectance and thermal emittance.

Darker colors like dark brown have an average solar reflectance of 5 9 while white granules have a solar reflectance of 31 3. 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. Reflective surfaces are a form of geoengineering. All rated roofing products will have a crrc label with the efficiency values listed.

Cool roofing is defined differently by various performance criteria in codes standards and incentive programs. Residential roofing options include asphalt shingles metal clay tiles and concrete tiles. 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. 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. Feature gaf proprietary color blends and enhanced shadow effect for a genuine wood shake look. Many homeowners elect a balance between solar reflectance and aesthetics. 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.

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. New technology helps to close the gap between aesthetics and solar reflectance. The solar reflectance and thermal emittance values of roofing products. The most well known type of reflective surface is the cool roof.

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.