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Solar reflectivity or reflectance is the ability of a material to reflect solar energy from its surface back into the atmosphere. The SR value is a number from 0 to 1.0.

LEED 2.2 sustainable sites credit 7.2 states that to receive one point, building owners should use a roof with a Solar Reflective Index (SRI) of 78 over at least 75 percent of the roof's surface for roofs with slopes less than 2:12. SRI is a unit developed by scientists at Lawrence Berkeley National Laboratory.

clean white roof could have an SRI of 100. Dark roofs usually have an SRI less than 20. way is by meeting or exceeding both the minimum solar reflectance and thermal emittance values.

The Solar Reflectance Index (SRI) is an indicator of the ability of a roof surface to return solar energy to the atmosphere. Roofing material surfaces with a higher SRI will be cooler than surfaces with a lower SRI under the same solar energy exposure, especially on a sunny day.

Solar Reflectance Index is a measure of a surface's ability to reflect the sun's solar energy (solar reflectance) and emit heat (emissivity). SRI is measured on a scale from 0 to 100. An SRI value closer to 0 indicates a darker or black surface and a value closer to 100 indicated a brighter or white surface.

The Solar Reflectance Index (SRI) is an indicator of the ability of a roof surface to return solar energy to the atmosphere. Roofing material surfaces with a higher SRI will be cooler than surfaces with a lower SRI under the same solar energy exposure, especially on a sunny day.

SR is the fraction of solar energy that is reflected by a surface on a scale of 0 to 1. It doesn't factor in emissions of thermal radiation the way SRI does.

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 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.