To measure the constructed surfaces ability to stay cool in the sun by reflecting solar radiation and emitting thermal radiation.
Computing the SRI and roof surface temperature based on solar reflectance and thermal emittance using ASTM standard E 1980. Reflectance is measured according to ASTM E 903, ASTM E 1918, or ASTM C 1549. Emmitance is measured according to ASTM E408 or ASTM C 1371.
SRI can be calculated based on the pitch of a roof, its weight, its solar reflectance and its thermal emittance (emissivity).
Vegetation will be evaluated based on the planted species and their variety.
