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Benefits
There are many positive benefits to a well designed and carefully constructed green, or vegetative, roof systems. Among them are:
Aesthetics, habitat and biodiversity: A green roof is an attractive feature that can improve occupant satisfaction. A green roof can often be more attractive than the surrounding landscape and can provide critical urban habitat for pollinators.
Stormwater Best Management Practice: Research shows that in temperate North America a green roof can restore evapotranspiration to pre-development levels. A 3.5" to 4" thick green roof will significantly reduce and delay stormwater runoff. A green roof can also improve runoff quality. In parts of North America where acid rain is an issue a green roof will raise the pH of stormwater runoff.
Energy savings and urban heat islands: A green roof functions as an evaporative cooler and can reduce air conditioning demand in a building leading to measurable savings. This results in peak energy demand reductions and lower urban summertime temperatures.
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