Wallbarn Protecto-Drain 20P Drainage Membrane - 20m x 2m

Wallbarn Protecto-Drain 20P Drainage Membrane - 20m x 2m

Protecto-drain 20P was developed for use as a reservoir and drainage layer in green roof construction. It is placed on top of the waterproofed, protected concrete deck and sist beneath a filter layer, the soil substrate and vegetation layers on extensive green roof systems.

The HDPE membrane is manufactured with the same 20mm cups, but the area between the cups is perforated. On a horizontal plane, this allows water to fillup in the cups helping to sustain the roots with any excess water escaping through the holes and able to run away beneath the membrane into the drainage outlet.

The water held in the cups can then be drawn back up through the filter layer to nourish the begetation aboce. This means that a constant level of water can be held in the resevoir cups, but the rainwater is effciently removed effectively and quickly from the roof, which will not become overloaded.

Made from high density polyethylene (HDPE), this hard wearing, flexible membrane is designed to direct water away from the surface of the structure towards the appropriate drainage system. It is very tough but lightweight and easy to handle, making it very adaptable and suitable for a large number of applications. It is also completely safe and contaminant free, and can be used safely with water courses. It is ideal for vertical surfaces and protects the waterproof membrane from abrasion and puncture damage caused by backfilling. Its cupped structure creates a permanent air gap between the wall and the backfill which helps to reduce pressure points and helps in the ventilation of the building and problems of damp. Gravity will encourage the water to flow down the surface and into the sump or drain constructed beneath. It is also an effective damp-proof layer on horizontal surfaces. It is fungus and rotproof and completely safe with drinking water.