If it should have to be removed at some time in the future for instance to repair the roof membrane below its removal should not damage the historic building.
Green roof infiltration.
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Research at penn state has shown that green roofs provide considerable reduction in the volume of stormwater leaving a developed site and they reduce the peak rates of runoff.
Green roofs also referred to as vegetated roofs eco roofs and roof gardens consist of a layer of vegetation that covers an otherwise conventional flat or moderately pitched roof.
A green roof is composed of multiple layers which may include a waterproofing roof protection layer moisture interception layer drainage layer leak detection layer an engineered planting medium and specialized plants.
Green roofs are unique in that they have the ability to capture and retain a volume depth of rain from each rainstorm.