Late last month, Toronto became the first city in North America to adopt a bylaw requiring the construction of green roofs on new developments. It comes into force Jan. 31, 2010.
A green roof is a system where a vegetated area becomes part of the building's roof. It includes plant life, a growing medium, a filter layer, a drainage layer, a root resistance layer and a waterproof membrane.
Under the new rules, a green roof will be required on all new buildings with more than 2,000 square metres of gross floor area. The area of the green roof will range from 20 per cent to 60 per cent of the roof, depending on the size of the development.
Green roofs have been used for years in Europe and the United States, but they are relatively new to Canada.
They are said to reduce stormwater runoff, energy consumption, the local ambient temperature and associated cooling costs. As well, they have been touted as beautifying the city, creating more green spaces and providing opportunities for food production.
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