Extensive Green Roofs

A properly designed and installed extensive green roof system can cost 108 248 m 2 10 23 sq ft while an intensive green roof costs 355 2 368 m 2 33 220 sq ft however since most of the materials used to build the green roof can be salvaged it is estimated that the cost of replacing a green roof is generally one third of the initial installation costs.

Extensive green roofs.

They fall into three main categories extensive intensive and semi intensive. The soil is usually not more than 5 deep and is sometimes contained by a tray system which provides a barrier to excessive growth protects the roof membrane and. The substrate is usually an aggregate mixed with about 20 organic material. A green roof is a layer of vegetation planted over a waterproofing system that is installed on top of a flat or slightly sloped roof.

The substrate sits on the green roof system filter sheet drainage layer protection layer. Extensive green roofs substrate based green roofs. The vegetation layer consists of sedums and wildflowers. Green roofs are also known as vegetative or eco roofs.

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. 8 to 20 per square foot. Extensive green roofs are generally made up of a very thin layer of soil or other planting medium with shallow root plants like sedum mosses and grasses. It also allows for a formal garden to be installed with paths grass lawn and flowers or pot plants.

Although there are no precise definitions of. 15 to 50 per square foot. A semi intensive green roof can give rise to a richer ecology with more diverse plant and animal species. Extensive green roof an extensive green roof system is characterized of its vegetation ranging from sedums to small grasses herbs and flowering herbaceous plants which need little maintenance and no permanent irrigation system the growing medium depth for an extensive green roof system is typically 6 inches or less.

What is the difference between an extensive and intensive green roof. Extensive green roofs. What is a green roof. Typically these roofs will have more soil and some small shrubs as well as the low growing wildflowers and sedums found on an extensive roof.

For a conventional roof. These extensive green roofs generally have 80mm of substrate. These roofs differ from each other in the thickness of the structure its weight and.