They fall into three main categories extensive intensive and semi intensive.
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By contrast extensive green roofs use shallower media depths less than 6 inches and require minimal maintenance.
The layers of a green roof must like any roof accommodate drainage and protect the building from the elements with a waterproof membrane.
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Although there are no precise definitions of them an extensive green roof has a shallow growing medium usually less than six inches with a modest roof load limited plant diversity minimal.
Because of the challenges of selecting plants for shallow media this publication focuses on extensive green roofs.
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Green roofs are also known as vegetative or eco roofs.
As a result the roof structure can require less maintenance saving the owner money in replacement costs over the long term life of the roofing system.
A green roof can increase the life expectancy of a roofing system by protecting the roofing materials from direct ultra violet radiation and extreme temperatures.
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A 10 4 acre extensive green roof in dearborn mich.