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MAY 2011 - General Services Administration

MAY 2011 - General Services Administration

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(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

  Administration, Services, General, Internal, General services administration

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