Green from the Ground Up: Sustainable, Healthy, and Energy-Efficient Home Construction, David Johnston, Scott Gibson, Taunton Press, 2008, ISBN 978-1-56158-973-9, ... A roof is a system of interdependent components that protects the house from the elements, buffers it from outdoor temperatures, and controls the flow of air and moisture. Roofing materials should be durable, able to withstand locdpolDyuuhkg
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