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.
Green roof palom.
River rouge assembly plant.
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.
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.
A 10 4 acre extensive green roof in dearborn mich.
Two types of green roof exist.
Because of the challenges of selecting plants for shallow media this publication focuses on extensive green roofs.
Green roofs are also known as vegetative or eco roofs.
By contrast extensive green roofs use shallower media depths less than 6 inches and require minimal maintenance.
Toronto was the first city in north america to pass a green roof law in 2009 requiring new buildings or additions that are greater than 21 000 square feet to cover between 20 and 60 percent of.
But they also must create a growing area and potentially provide support irrigation and root protection barriers while staying as light as possible.
They fall into three main categories extensive intensive and semi intensive.