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Line 2: [[file:GRalllayers.JPG|400px|thumb|right|Layered system green roof with all component layers showing. A key benefit of green roofs is (Photo source: CVC)]]
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=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. Growing medium depth determines which plants can be planted, and the components of green roofs can either be loose-laid or fused together. The proper installation of green roofs can help to achieve water balance targets, promote biodiversity and provide green space.
[[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. Growing medium depth determines which plants can be planted, and the components of green roofs can either be loose-laid or fused together. The proper installation of green roofs can help to achieve water balance targets, promote biodiversity and provide green space.
=Types=
=Types=
=Component description=
=Component description=
[[File:Layers green roof.PNG|thumb|right|400px|Generalized cross-section view of a green roof showing key components and common layers that make up this LID BMP (TRCA, 2018)<ref name="example1" />]]
[[File:Layers green roof.PNG|thumb|right|400px|Generalized cross-section view of a green roof showing key components and common layers that make up this LID BMP (TRCA, 2018)<ref name="example1" />]]
[[file:GRalllayers.JPG|400px|thumb|right|Layered system green roof with all component layers showing. A key benefit of green roofs is (Photo source: CVC)]]
*Vegetation free zone: separates the green roof perimeter from the roof perimeter and other structures on the roof (e.g., vents), that is kept devoid of vegetation and natural debris.
*Vegetation free zone: separates the green roof perimeter from the roof perimeter and other structures on the roof (e.g., vents), that is kept devoid of vegetation and natural debris.
*Root barrier: often a clear plastic sheet, the root barrier layer protects the water-proofing membrane from root penetration and degradation by microbial activity.
*Root barrier: often a clear plastic sheet, the root barrier layer protects the water-proofing membrane from root penetration and degradation by microbial activity.