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==Overview==

==Overview==

Modern green roofs are a rapidly developing  commercial market in Ontario. Their primary benefit as a LID technology is in maximizing evapotranspiration for water balance targets.

Modern green roofs are a rapidly developing  commercial market in Ontario. Their primary benefit as a LID technology is in maximizing [[evapotranspiration]] for water balance targets.

Green roofs are sometimes referred to as 'ecoroofs', 'vegetated roofs', 'living roofs'.

Green roofs are sometimes referred to as 'ecoroofs', 'vegetated roofs', 'living roofs'.

{{textbox|Green roofs are ideal for:

{{textbox|Green roofs are ideal for:

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Roof Drain.jpg | Example of gravel edging around a roof, which needs weeding. <br>Photo credit: jchill

Roof Drain.jpg | Example of gravel edging around a roof, which needs weeding.

Red Drain.jpg| Example of gravel edging around a roof drain, which needs weeding. <br>Photo credit: jchill 

Red Drain.jpg| Example of gravel edging around a roof drain, which needs weeding.  

Native Child.jpg| The amenity value of this roof is enhanced by the tall and climbing plants screening the high safety fences. <br>Photo credit: jchill

Native Child.jpg| The amenity value of this roof is enhanced by the tall and climbing plants screening the high safety fences.  

PondRd2.jpg| Very light maintenance has permitted a stand of Mullein to develop on this prairie style green roof, increasing the biodiversity value.  

PondRd2.jpg| Very light maintenance has permitted a stand of Mullein to develop on this prairie style green roof, increasing the biodiversity value. <br>Photo credit: jchill

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The choice of vegetation on an extensive green roof is insignificant in stormwater management compared to the choice of planting medium or the provision of irrigation. The vegetation should be selected to be resilient to both very wet and very dry periods.''Sedum'' species are the most common choice, demonstrating excellent longevity in systems with or without irrigation.  

The choice of vegetation on an extensive green roof is insignificant in stormwater management compared to the choice of planting medium or the provision of irrigation. The vegetation should be selected to be resilient to both very wet and very dry periods.''Sedum'' species are the most common choice, demonstrating excellent longevity in systems with or without irrigation.  

Some projects expect the low growing ''Sedum'' to  remain in graphic designs according to species and flower color. This is not a realistic expectation without significant maintenance costs. Instead project stakeholders should be prepared early in the design process to embrace the green roof as a living and evolving ecosystem. Designs which incorporate both ''Sedum'' and native species can help with this.

Some projects expect the low growing ''Sedum'' to  remain in graphic designs according to species and flower color. This is not a realistic expectation without significant maintenance costs. Instead project stakeholders should be prepared early in the design process to embrace the green roof as a living and evolving ecosystem. Designs which incorporate both ''Sedum'' and native species can help with this.

===Drains and Vegetation Free zones===

 

===Drains and vegetation free zones===

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==

{{:Green roofs: Performance}}

{{:Green roofs: Performance}}

==Incentives and Credits==

==Incentives and credits==

===In Ontario===

===In Ontario===

City of Toronto updated their 'Eco roof' incentive program in 2017 . It now includes grants for structural assessment and is available to non-profit organisations [http://www1.toronto.ca/wps/portal/contentonly?vgnextoid=e08354ae91cda510VgnVCM10000071d60f89RCRD].  

City of Toronto updated their 'Eco roof' incentive program in 2017 . It now includes grants for structural assessment and is available to non-profit organisations [http://www1.toronto.ca/wps/portal/contentonly?vgnextoid=e08354ae91cda510VgnVCM10000071d60f89RCRD].  

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LEED offer a relatively large number of points for green roofs compared to other LID technologies.  

LEED offer a relatively large number of points for green roofs compared to other LID technologies.  

[http://www.usgbc.org/node/2613129?return=/credits '''Sustainable Sites: Open space (1 point)''']

[http://www.usgbc.org/node/2613129?return=/credits '''Sustainable Sites: Open space (1 point)''']

This credit applies to accessible green roofs on tall buildings with little other outdoor space.

This credit applies to accessible green roofs on tall buildings with little other outdoor space.

[http://www.usgbc.org/node/2758192?return=/credits '''Sustainable Sites: site development - protect or restore habitat (up to 2 points)''']

[http://www.usgbc.org/node/2758192?return=/credits '''Sustainable Sites: site development - protect or restore habitat (up to 2 points)''']

This credit applies to green roofs planted with 'native and adapted vegetation' on tall buildings with little other outdoor space

This credit applies to green roofs planted with 'native and adapted vegetation' on tall buildings with little other outdoor space

[http://www.usgbc.org/node/2613950?return=/credits '''Sustainable Sites: Heat island reduction (up to 2 points)''']

[http://www.usgbc.org/node/2613950?return=/credits '''Sustainable Sites: Heat island reduction (up to 2 points)''']

Green roofs are weighted as effectively as 'High-Reflectance' roofs in a simple calculation to determine the credit.

Green roofs are weighted as effectively as 'High-Reflectance' roofs in a simple calculation to determine the credit.

{{:LEED: Rainwater management}}

{{:LEED: Rainwater management}}

==External links==

 

==External Links==

*[https://www.greenroofs.org/ Green Roofs for Healthy Cities]

*[https://www.greenroofs.org/ Green Roofs for Healthy Cities]

===Proprietary Systems===

===Proprietary systems===

{{:disclaimer}}

{{:disclaimer}}

*[http://www.nlsm.ca/ Next Level Stormwater Management]

*[http://www.nlsm.ca/ Next Level Stormwater Management]