How Much Gph For Extensive Green Roof

Extensive green roofs are a surface treatment for rooftops typically less than 6 inches in depth involving the addition of growth media and plants to create a sustainable green space on a flat or nearly flat roof.

How much gph for extensive green roof.

They need at least 30cm 1ft depth of. They are fairly lightweight and can be installed on roofs with a pitch from 0º to 30º. 15 to 50 per square foot. Intensive vs extensive green roof.

A green roof also known as a rooftop garden or a living roof is a vegetative layer grown on a rooftop. A semi extensive green roof sits somewhere in between the two main options and is based on the extensive roof principles. Intensive thick extensive thin and semi extensive somewhere in between. With more depth of growing substrate 100 200 mm it can support a greater diversity of plants but not shrubs and trees.

How much do green roofs cost. The popularity of green roofs has increased in the united states due to their many benefits while pretty green roofs serve a much greater purpose than simple beautification. Semi extensive green roofs take 12 18 months to establish during which time they will need maintenance. 8 to 20 per square foot.

These are usually container or raised bed gardens. Unlike traditional black tar roofs green roofs reduce energy costs by absorbing heat instead of attracting it and. An extensive green roof is the most common and least expensive type of green roof with costs ranging from 10 20 a square foot 2. Semi extensive green roof.

There are three basic types of green roof. Hand weeding watering and feeding are all necessary and it may sometimes be necessary to replant areas that have failed. Consists of a thick layer of soil 50 200mm in which a variety of grasses herbs flowers and shrubs can grow. Extensive green roofs have a growing medium of less than 200mm and a roof structure similar to conventional roof coverings.

They are virtually maintenance free. Extensive green roof advocates have claimed numerous benefits including improved air quality stormwater attenuation reduction of. A 2006 study by the university of michigan comparing costs of conventional and green roofs showed that on average installing a green roof costs about 22 00 sq. They consist of a thin layer of soil with continuous coverage of growing material.

They weigh between 60 200kg sqm and are relatively economical. An extensive green roof on the other hand is a thinner lighter version that looks more similar to a standard roof. It can be sloped or flat.