Extensive Green Roof Thickness

They are recognized as a bench mark set of guidelines for green roofs in germany.

Extensive green roof thickness.

An extensive green roof or sedum roof is a roof with vegetation that is more or less self perpetuating and that can further develop and maintain itself. The thickness of the green roof can vary from 3 centimeters of the substrate of the extensive roofs up to 30 cm of the substrate of the intensive green roofs. Roughly speaking extensive green roofs have a substrate thickness of between 4 and 15 cm and a weight of 30 to 220 kilo per m2. Extensive green roofs substrate based green roofs.

A green roof with a lightweight solution of 30 kg m2 is only possible with sedum vegetation and a green roof with a weight of 220 kg m2 is composed of a combination of sedum grasses herbs or host plants. 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. These extensive green roofs generally have 80mm of substrate. The substrate is usually an aggregate mixed with about 20 organic material.

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. 15 to 50 per square foot. The nominal thickness of a green roof is the approximate total height of the soil and drainage components that constitute the green roof system excluding the roof structure insulation waterproofing and plants it is common practice to use the term extensive to describe green roofs that are very thin and will only support hardy drought resistant vegetation.

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. Thickness weight psf 1 in vegetated mat 8 15. Extensive green roofs 10 50 psf 6 inch extensive say 40 psf typ. Green roof components.

Structural engineering analysis critical. Roughly speaking extensive green roofs have a thickness of between 4 and 15 cm and a weight of between 30 and 220 kg m2. 8 to 20 per square foot. An intensive or semi intensive green roof has a higher thickness as it allows to accommodate a vegetation with a strong root development and aerial type therefore not only turf but also shrubs and small trees.

Green roof weight. For a conventional roof.