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Green roofs (factsheet, John Janzen Nature Centre Case Study) have vegetation growing on top of buildings to detain and retain rainwater. They also offer shade and insulation benefits that result in reduced energy usage.

A typical green roof consists of several layers, including vegetation, growing medium, drainage filter, drainage layer, root barrier, waterproof and roofing membrane, cover board, thermal insulation, vapour barrier and building support structure.

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Drainage Infrastructure

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