Green roofs can provide a wide range of public and private benefits and have been successfully installed in countries around the world.
Green roof people.
This green space could be below at or above grade but in all cases it exists separate from the ground.
Green roofs last longer than conventional roofs reduce energy costs with natural insulation create peaceful retreats for people and animals and absorb storm water potentially lessening the need for complex and expensive drainage systems.
This has not been researched but anecdotal evidence from germany in the late 1990s is of interest.
A roof is designed to protect the building and to shed precipitation.
However green roofs in many cases are meant to retain water over a longer period of time to slow stormwater runoff and to nourish the plants.
It is even more important that the roof covering be watertight to prevent leaks into the building.
Green roofs serve several purposes for a building such as absorbing rainwater providing insulation creating a habitat for wildlife increasing benevolence and decreasing stress of the people around the roof by providing a more aesthetically pleasing landscape and helping to lower urban air temperatures and mitigate the heat island effect.
Green roofs for healthy cities grhc is the north american industry association for the green roof and wall sectors.