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Dimpled sheet

PM P-STANDARD GS is a water-storing, perforated dimpled membrane and is regarded as an ideal solution for extensive roof greening. Compared to normal dimpled membranes, PM P-STANDARD GS offers a high drainage and water storage capacity and assumes the function of a protective and water storage layer in green roofs. The 8 mm dimples have a water storage capacity of approx. 3 l/m².

The pressure resistance of approx. 200 kN/m² offers a high level of security, corresponding to a compressive strength of approx. 20 tonnes per m². The 8 mm dimpled membrane also offers a high drainage capacity.

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.

Material HDPE
Dimple height approx. 8 mm
Number of dimples 1.710 dimples/m²
Colour black
Compressive strength approx. 200 kN/m²
Water flow capacity
in the plane i = 1.0
approx. 2,25 l/s·m at 20 kPa rigid/soft
Water flow capacity
in the plane i = 0.01
approx. 0,16 l/s·m at 20 kPa rigid/soft
Water flow capacity
in the plane i = 0.02
approx. 0,26 l/s·m at 20 kPa rigid/soft
Water flow capacity
in the plane i = 0.03
approx. 0,34 l/s·m at 20 kPa rigid/soft
Water storage approx. 3,0 l/m²
Roll length 20 m or on request
Roll width 2,0 m
Air volume between the dimples approx. 5,5 l/m²
Temperature resistance –30 °C to +80 °C
Chemical properties chemical-resistant
Physiological properties safe for drinking water
Fire behaviour class E

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Related accessories


PM RANDABSCHLUSS­PROFIL in metal or plastic. A practical edge trim profile as the top finish for dimpled and drainage sheets.


PM POWER FIX high-performance adhesive is a permanently elastic adhesive for gluing and connecting PMI DPC, PMI dimpled and drainage sheets and PMI roofing membranes.


PM BUTYL ADHESIVE TAPE, 20 mm wide. Waterproof butyl rubber compound with strong adhesive on both sides for sealing and bonding wind and vapor barriers, underlay membranes, dimpled and drainage membranes as well as DPC.