6e2b6f48_Building_Envelope_Technologies__Benefits
[Technology] Green Roofs [Application] Appropriate for deployment within most building categories with higher roof to conditioned floor area ratios and should be considered in building design, renovation, or during roof replacement projects. [Weighted Score] 33 [Benefits] 
Vegetation on the roof reduces heat load and adds insulation to the roof. Also reduces storm runoff from roof.
Federal Energy Management Program: New and Underutilized Building Envelope Technologies