Transcription of MAY 2011 - General Services Administration
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The Benefits and Challenges of Green Roofs on Public and Commercial BuildingsA Report of the United States General Services AdministrationMAY 2011 Front 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 .. Cost .. Scope of Report .. BENEFITS .. Stormwater Management .. Biodiversity and Habitat .. Urban Heat Island .. Energy .. Urban Agriculture .. Acoustics .. Air Quality .. Aesthetics and Quality of Life .. Job Generation and Economic Development .. Roof Longevity .. COST BENEFIT ANALYSIS ..673 .1 P u r p o s e .. Methodology .. Assumptions .. Results .. CHALLENGES TO GREEN ROOF Siting and Design .. Installation and Construction .. Maintenance and Operation.
(internal rate of return of 5.2%) and . 6.6 years in Washington DC (internal rate of return of 4.2%), and conservative analysis puts the average life expectancy of a green roof at 40 years, versus 17 for a conventional roof. In the National Capital Region, if green roofs were to replace conventional roofs on all 54 million square
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