Two-layer raised sheet for protection and horizontal or vertical drainage

Humidity and water ingress against, on and under structures are among the main causes of damage.

Effective protection against moisture is necessary to ensure the longevity of a building, engineering structure, or underground construction. This protection is most often achieved with a waterproofing layer, which may not be sufficient.

The Doerken company wanted to address this concern by creating a raised layer intended to create a protective and drainage layer, the DELTA®-NP DRAIN.

Areas of use:

- in horizontal drainage

■ Green roof terraces

■ Roof terraces accessible or inaccessible to pedestrians

■ Parking lots with paving or slabs

- in vertical drainage

■ Buried walls

■ Berlin walls

■ Molded walls

Specific characteristics:

■ Creates a separation layer between the wet fill and the support

■ Allows runoff and/or infiltration water to be filtered and then drained

■ Allows free drainage into the blade

air formed by the growths

■ Prevents direct application of hydrostatic pressure to the support

- in drainage under paving

 ■ Advantageously replaces the classic drainage process (“draining hedgehogs”)

■ Serves as a formwork base and support for welded mesh

■ Is waterproof to concrete laitance

Technical characteristics :

■ Material: high-density polyethylene raised sheet combined with a polypropylene filter geotextile heat-sealed onto the raised areas

■ Material thickness: about 0,6 mm

■ Temperature resistance:

- 30°C to + 80°C

■ Compressive strength:

approximately 150 kN/m2 (0,15 N/mm2)

■ Surface mass: approximately 560 g/m2

■ Chemical properties: non-polluting for drinking water, resistant to chemical, bacteriological, alkaline agents and resistant to roots.