But they also must create a growing area and potentially provide support irrigation and root protection barriers while staying as light as possible.
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Green roofs are also known as vegetative or eco roofs.
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.
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.
By contrast extensive green roofs use shallower media depths less than 6 inches and require minimal maintenance.
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Because of the challenges of selecting plants for shallow media this publication focuses on extensive green roofs.
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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.
They fall into three main categories extensive intensive and semi intensive.