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[[File:Pass Filter Bed green roof.PNG|400px|thumb|right|Modular green roof system]]
[[File:Pass Filter Bed green roof.PNG|400px|thumb|right|Fully constructed green roof.]]
=Overview=
=Overview=
[[Green roofs]] are composed of several layers (waterproof membrane or existing membrane, root barrier, drainage layer, filter fabric, growing medium) that support the growth of plants and other vegetation on top of a roof.
[[Green roofs]] are composed of several layers (waterproof membrane or existing membrane, root barrier, drainage layer, filter fabric, growing medium) that support the growth of plants and other vegetation on top of a roof.