Green Building Index – Solar Reflective Index (SRI) requirements for roof

Green Building Index – Solar Reflective Index (SRI) requirements for roof
(The Solar Reflective Index 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 (reflectance 0.05, emittance 0.90) is 0 and a standard white (reflectance 0.80, emittance 0.90) is 100. SRI is calculated according to ASTM E 1980 using values for reflectance and emissivity).
Similar to LEED rating program, a metal roof manufactured using PVF2 Series or METALLIC PVF2 Series pre-painted steel can qualify for one point in SM12 Design under Sustainable Site Planning & Management category if it covers at least 75% of the roof surface area (excluding parapets, skylights and equipment) and meets the following criteria for Solar Reflectance Index (SRI) values:
Low slope (< 2:12) min SRI of 78
Steep slope ( > 2:12) min SRI of 29
The following is an extract from GBI Assessment Criteria for Non-Residential New Construction (NRNC).