“Results vary according to size of the building, climate and type of green roof, but when Environment Canada ran a simulation, they found that a typical one-story building with a grass roof and 3.9 inches (10 cm) of growing medium would result in a 25% reduction in summer cooling needs.”
Read more: http://www.thedailygreen.com/green-homes/latest/green-roofs#ixzz0yWbYn4f3
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