— Slope SRI Material 0.75 29 X SRI Value Vegetated Roof Area 0.5 Total Roof Deducoci Area Area Table 1. Solar Reflectance Index (SRI) for Typical Roofing Materials Example SRI Values for Solar Infrared Temperature Solar Solar Reflectance Infrared Eminence Temperature Rise SRI Gray EPDM 0.23 0.87 68°F