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Line 101: <gallery mode="packed" widths=300px heights=300px>TD Bank.jpg|The vegetation on this extensive green roof is designed to withstand the deep shade of being in downtown Toronto. </gallery></panelSuccess><panelInfo><gallery mode="packed" widths=300px heights=300px>TBG2005.jpg|Sloped extensive green roof at Toronto Botanical Gardens, designed with four species of Sedum (Image: Terry McGlade)TBG2014.jpg|Same extensive green roof illustrating the increased biodiversity resulting from very light maintenance over 10 years </gallery></panelInfo></div>
→Planning Considerations
==Planning Considerations==
==Planning Considerations==
[[File:TBG2005.jpg|thumb|Sloped extensive green roof at Toronto Botanical Gardens, designed with four species of Sedum (Image: Terry McGlade)]]
[[File:TBG2014.jpg|thumb|Same extensive green roof illustrating the increased biodiversity resulting from very light maintenance over 10 years]]
Green roofs offer a variety of co-benefits beyond stormwater management. In urban centers they are often constructed to accommodate a roof terrace or amenity space. In this scenario the direct stormwater capture benefit is restricted to the areas with vegetation planted. Another increasingly popular use for rooftop space is for urban farming. Again, the direct stormwater capture benefit is restricted to the areas with planters.
Green roofs offer a variety of co-benefits beyond stormwater management. In urban centers they are often constructed to accommodate a roof terrace or amenity space. In this scenario the direct stormwater capture benefit is restricted to the areas with vegetation planted. Another increasingly popular use for rooftop space is for urban farming. Again, the direct stormwater capture benefit is restricted to the areas with planters.
To maximize the utility of a green roof as a low impact development tool, coverage with planting should be maximized. In many cases this means only inaccessible spaces are used.
To maximize the utility of a green roof as a low impact development tool, coverage with planting should be maximized. In many cases this means only inaccessible spaces are used.
==Design==
==Design==
[[File:TD Bank.jpg|thumb|The vegetation on this extensive green roof is designed to withstand the deep shade of being in downtown Toronto.]]
<h4>Roof</h4>
<h4>Roof</h4>
<h4> Drains and Vegetation Free zones </h4>
<h4> Drains and Vegetation Free zones </h4>
Vegetation free areas are often required around the perimeter of the roof to reduce wind uplift, on larger areas requiring firebreaks, for access paths and around drains. To prevent accumulation of sediment and migration of the vegetation, the vegetation free areas should not be filled with decorative aggregate or river rock. Instead concrete pavers or other surfaces that do not actively trap particles will reduce weeding maintenance.
Vegetation free areas are often required around the perimeter of the roof to reduce wind uplift, on larger areas requiring firebreaks, for access paths and around drains. To prevent accumulation of sediment and migration of the vegetation, the vegetation free areas should not be filled with decorative aggregate or river rock. Instead concrete pavers or other surfaces that do not actively trap particles will reduce weeding maintenance.
==Performance==
==Performance==