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.
Green roof infiltration.
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.
Installing a green roof can also require major changes to a building.
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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.
Many jurisdictions now require building owners to collect stormwater in infiltration basins that clean and slowly release the water back into the ground to help reduce the burden on the sewer systems green roofs help do this naturally without the need for special infiltration basins or equipment.