Reduce heat islands (thermal gradient differences between developed and undeveloped areas) to minimize impact on microclimate and human and wildlife habitat.
Choose one of the following options:
Use roofing materials having a solar reflectance index (SRI) equal to or greater than the values in the table below for a minimum of 75% of the roof area. If more than 75% of the roof area is covered with the SRI material, the SRI value may be lower than the required value if the resulting area-weighted equivalent SRI performance is at least as high as having the required value on 75% of the area.
Implement a maintenance program that ensures all SRI surfaces are cleaned at least every two years to maintain good reflectance.
Install and maintain a vegetated roof covering 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
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