PM P-20

PM P-20 is a water-storing, perforated dimpled membrane and is regarded as an ideal solution for extensive and intensive roof green­ing. Compared to normal dimpled membranes, PM P-20 offers many times the drainage and water storage capacity and assumes the function of a protective and water storage layer in green roofs. The 20 mm dimples have a water storage capacity of approx. 6 l/m². The pressure resistance of approx. 150 kN/m² offers a high level of secu­rity, corresponding to a compressive strength of approx. 15 tonnes per m². The 20 mm dimpled membrane also offers a unusually high drainage capacity of i = 0.02; approx. 0.61 l/s·m. It can therefore also be used for very large drainage lengths and/or very low roof slopes.

The plant substrate can be applied directly on the dimpled membrane after laying a separate geotextile. Thanks to the perforation, the water-storing drainage membrane is permeable and can also be used for inverted roofs. This prevents a film of water from forming on the inverted roof insulation. In walkable areas without vegetation, no geotextile is used. The base layer and the bedding material can then be applied directly on the dimpled membrane without changing the ma­terial, and then the pavement or slab covering can be laid on top of it.