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→50-Year life cycle cost break down
==Overview==
==Overview==
[[Green Roofs]] consist of a layer of [[Green roofs: Planting|vegetation]] and [[Green roof media|planting medium]] installed on top of a [[Green roof construction|conventional flat or sloped roof]]. Green roofs are touted for their environmental benefits as they improve energy efficiency, reduce urban heat island effects and create greenspace for passive recreation and aesthetic enjoyment. They are also desirable for their water quality, water balance and peak flow control benefits. The green roof acts like a lawn or meadow by temporarily storing rainwater in the planting medium and ponding areas. Excess rainfall enters [[underdrains]] and [[overflow]] points and is conveyed to a storm sewer or other stormwater practice in the building drainage system. After a storm, a large portion of the stored water is evapo-transpired by the [[plants]], evaporated or slowly drains away. STEP has prepared a life cycle cost estimate for an extensive, 4 inch deep pre-grown sedum mat, green roof design configuration, based on a 2,000 m<sup>2</sup> roof drainage area, runoff control target of 25 mm depth, for comparison which can be viewed below. To generate your own life cycle cost estimates customized to the development context, design criteria, and constraints applicable to your site, access the updated [https://sustainabletechnologies.ca/lid-lcct/ LID Life Cycle Costing Tool (LCCT) here].
[[Green Roofs]] consist of a layer of [[Green roofs: Planting|vegetation]] and [[Green roof media|planting medium]] installed on top of a [[Green roof construction|conventional flat or sloped roof]]. Green roofs are touted for their environmental benefits as they improve energy efficiency, reduce urban heat island effects and create greenspace for passive recreation and aesthetic enjoyment. They are also desirable for their water quality, water balance and peak flow control benefits. The green roof acts like a lawn or meadow by temporarily storing rainwater in the planting medium and ponding areas. Excess rainfall enters [[underdrains]] and [[overflow]] points and is conveyed to a storm sewer or other stormwater practice in the building drainage system. After a storm, a large portion of the stored water is evapo-transpired by the [[plants]], evaporated or slowly drains away. STEP has prepared a life cycle cost estimate for an extensive, 4 inch deep pre-grown sedum mat, green roof design configuration, based on a 2,000 m<sup>2</sup> roof drainage area for comparison which can be viewed below. To generate your own life cycle cost estimates customized to the development context, design criteria, and constraints applicable to your site, access the updated [https://sustainabletechnologies.ca/lid-lcct/ LID Life Cycle Costing Tool (LCCT) here].
==Design Assumptions==
==Design Assumptions==
==Construction Costs==
==Construction Costs==
[[File:Construction Breakdown GreenRoof No Infil.PNG|thumb|center|950px|'''Construction Costs Per Unit Drainage Area (CAD$/m<sup>2</sup>) - No Infiltration Design''']]
[[File:Construction Breakdown GreenRoof No Infil 2023.PNG|thumb|center|950px|'''Construction Costs Per Unit Drainage Area (CAD$/m<sup>2</sup>) - Green Roof: Extensive 4 inch deep sedum mat''']]
Above you can find a breakdown of construction costs by expense type for the 2,000 m2, 4 inch deep pre-grown sedum mat green roof design configuration.<br>
Above you can find a breakdown of construction costs by expense type for the 2,000 m<sup>2</sup>, 4 inch deep pre-grown sedum mat green roof design configuration.<br>
Material & Installation expenses represent the largest portion of total construction costs (85%).
Material & Installation expenses represent the largest portion of total construction costs (85%).
===25-Year life cycle cost break down===
===25-Year life cycle cost break down===
[[File:25yr LCCT GreenRoof No Infil.PNG|thumb|center|900px|'''Green Roof: Extensive 4 inch deep sedum mat''']]
[[File:25yr LCCT GreenRoof No Infil 2023.PNG|thumb|center|950px|'''Green Roof: Extensive 4 inch deep sedum mat''']]
<small>'''Note:''' Click on each image to enlarge to view associated life cycle cost estimate.</small><br>
<small>'''Note:''' Click on each image to enlarge to view associated life cycle cost estimate.</small><br>
</br>
===50-Year life cycle cost break down===
===50-Year life cycle cost break down===
[[File:50yr LCCT GreenRoof No Infil.PNG|thumb|center|900px|'''Green Roof: Extensive 4 inch deep sedum mat''']]
[[File:50yr LCCT GreenRoof No Infil 2023.PNG|thumb|center|950px|'''Green Roof: Extensive 4 inch deep sedum mat''']]
<small>'''Note:''' Click on each image to enlarge to view associated life cycle cost estimate.</small><br>
<small>'''Note:''' Click on each image to enlarge to view associated life cycle cost estimate.</small><br>
</br>
==Cost Summary Tables==
==Cost Summary Tables==
[[File:Layers green roof.PNG|thumb|right|500px|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"> TRCA. 2018. Fact Sheet - Inspection and Maintenance of Stormwater Best Management Practices: Green Roofs. https://sustainabletechnologies.ca/app/uploads/2018/02/Green-Roofs-Fact-Sheet.pdf</ref>]]
[[File:Layers green roof.PNG|thumb|right|500px|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"> TRCA. 2018. Fact Sheet - Inspection and Maintenance of Stormwater Best Management Practices: Green Roofs. https://sustainabletechnologies.ca/app/uploads/2018/02/Green-Roofs-Fact-Sheet.pdf</ref>]]
[[File:Design Table GreenRoof No Infil.PNG|700px]]<br>
[[File:Design Table GreenRoof No Infil update 2023.PNG|800px]]<br>
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==References==
==References==