Reduce heat islands (thermal gradient differences between developed and undeveloped areas) to minimize impact on microclimate and human and wildlife habitat.
Use roofing materials having a Solar Reflectance Index (SRI)5 equal to or greater than the values in the table below for a minimum of 75% of the roof surface.
Install a vegetated roof for at least 50% of the roof area.
Install high albedo and vegetated roof surfaces that, in combination, meet the following criteria:
(Area of SRI Roof / 0.75) + (Area of vegetated roof / 0.5) >= Total Roof Area