ND 4+1h Drainage system

Product code


The ND 4+1h Drainage system is the ideal under layer for an extensive green roof. This multifunctional, CE-marked drainage system with high compressive strength protects the vegetation from water stagnation, while at the same time storing water for dry periods in the built-in water reservoir.

In addition, the ND 4+1h Drainage System protects the waterproofing membrane from a build-up of hydrostatic pressure and mechanical loads, both during and after installation. Details

ND 4+1h Drainage system

Dimensions approx. 30 m x 1.25 m
Packaging approx. 37.5 m², roll
Weight approx. 1,017g/m²
Build-up height approx. 17 mm
Compressive strength approx. 450 kPa
Material dimpled sheet recycled, high impact polystyrene (HIPS)
Material geotextile filter polypropylene (PP)
Material vapour-permeable geotextile polypropylene (PP) and propyethylene (PE)
Perforations /m² approx. 1,540, ? 6.3 mm
Water reservoir approx. 4.3 l/m²
Drainage capacity i = 1 (20 kPa) 7.86 l/(s.m)
Drainage capacity 2 % fall (20 kPa) 0.96 l/(s.m)
CE hEN EN 13252

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