MAY 2011 - General Services Administration
The Benefits and Challenges of Green Roofs on Public and Commercial BuildingsA Report of the United States General Services AdministrationMAY 2011Front cover: Image of the green roof on the United States Department of Transportation Headquarters GSA GREEN ROOF BENEFITS AND CHALLENGESTABLE OF CONTENTSCONTENTSEXECUTIVE Purpose of Study ........................................ ........................................ ........................................ ........... Methodology ........................................ ........................................ ........................................ .................. Background to Green Roofs.
Green roof stormwater retention is affected by roof construction, size and slope, as well as the plants, drainage layer and growth medium used. Green roofs can form a key part of a site-level . stormwater management plan, reducing peak flow rates by up to 65% and increasing the amount of time it takes
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