Two-layer drainage sheets such as PM TERRA-TEC are effective, high-performance protection and drainage systems for horizontal surface drainage under walkable and drivable areas. Efficient surface drainage is necessary here, as standing water can damage the substructure and frost damage can lead to the pavement covering being raised.
The combination of a dimpled sheet with a geotextile forms a high-performance drainage layer, through which precipitation water is reliably drained off.