Extensive Green Roofs

Extensive green roofs substrate based green roofs.

Extensive green roofs.

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. 8 to 20 per square foot. 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. It also allows for a formal garden to be installed with paths grass lawn and flowers or pot plants.

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. They fall into three main categories extensive intensive and semi intensive. These systems are ideal for efficient stormwater. What is the difference between an extensive and intensive green roof.

Although there are no precise definitions 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. Green roofs are also known as vegetative or eco roofs. 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.

The vegetation layer consists of sedums and wildflowers. An extensive green roof is a lightweight low maintenance option that typically does not require irrigation and consists primarily of sedum. These extensive green roofs generally have 80mm of substrate. For a conventional roof.

The substrate is usually an aggregate mixed with about 20 organic material. 15 to 50 per square foot. These roofs differ from each other in the thickness of the structure its weight and. A semi intensive green roof can give rise to a richer ecology with more diverse plant and animal species.

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 sits on the green roof system filter sheet drainage layer protection layer. Extensive green roofs.