Intensive or extensive of Green Roof
Intensive or extensive
Intensive/active green roofs have a deep growing medium that supports a variety of landscape design and growth. They are accessible and used as recreational space. An example of an intensive/active green roof is the Manulife Centre which is located over a parking garage. It is a well established green roof (25 years old) with mature trees that reach three stories high.
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Manulife Centre - 44 Charles St. West, Toronto
By contrast, an extensive green roof has a shallow growing medium and the landscaping is designed to be more self-sustaining, requiring less maintaince than an intensive system. Extensive green roofs are less expensive than intensive systems, since they are lighter and require less structural support and need less frequent maintenance. The roof on Mountain Equipment Co-op in Toronto is an example of an extensive green roof, built in 1998.
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Mountain Equipment Co-op - 400 King St. W., Toronto
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