Wednesday, November 24, 2010

Vegetated Roof Design - Flat Roof Cross Section

Extensive Green Roof Design - Flat Roof MetroVerde
Depicted above is a typical cross section of an Extensive Green or Vegetated Roof Design lightweight - typically around ten pounds per square foot - or about 49 Kg per square meter fully saturated.

The system design uses a high tech woven growing mat over a sacrificial TPO layer.

The sacrificial TPO layer is adhered to the underlying roof TPO layer.

The grow mat is adhered to the sacrificial TPO layer.

The system is edged with aluminum or vinyl side walls however we have found in practice the side walls are not really necessary when using a fast growing plant with a strong root system and a tackifier for the engineered soil.

The edge trim is typically more for appearance yet does offer some stablization of the planting media.

After working for years with various types of mats and mat manufacturers we can now say that several mat types have been developed that will work sufficiently for holding the plants in place and allowing for adequate drainage.

An extensive nature-irrigated green roof does not have to be heavy.

Use of a light-weight system is now possible thanks to continued product development of woven mat materials like bi-axial geo-grids.

As always - email us with your questions.

Happy Thanksgivign and Happy Green Roofing!



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