Can I Pick Any Color for My Structure’s Roofing System?
Solar Reflectivity (SR)
Solar reflectivity or reflectance (SR) is the ability of a material to reflect solar energy from its surface back into the atmosphere. An SR value of 0 indicates that the material absorbs all solar energy, while a value of 1.0 indicates it is all reflected.
Energy Star™ requires SR testing of both new and aged roof products. By today’s standard, roofing products must have an SR value of 0.25 or higher for steep slope (above 2:12) roofing and an SR value of 0.65 or higher for low slope (2:12 or less) roofing.
Solar Reflectance Index (SRI)
Counterpart to solar reflectivity is a material’s solar reflectance index (SRI). SRI is a measure of energy emissivity and can be used as an indicator of how hot a material is likely to become when solar radiation is incident on its surface. The lower the SRI, the hotter a material is likely to become in the sunshine.
Every color option available from STAR has a unique SR and SRI value. If you’re building a structure that must be compliant with LEED requirements, special attention to roofing color choice is necessary. Your BRI Building representative can work with you to determine which color options are compliant.