Water retention systems | trafficable roofs

The water retaining and retarding system suitable for intensive green roofs that contributes to sustainable and climate-proof cities.

The core of this water retention system for trafficable roofs is the ND WSE hd Water Retention Element. These elements slow down water drainage during heavy rain showers and have a temporary water storage between 47 and 142 l/m² (depending on the height of the chosen height of the element: 50, 80, 100 and 150 mm).

Due to the high compressive strength, all ND WSE hd Water Retention Elements are perfectly applicable for trafficable roof constructions (pedestrians, passenger cars and heavy goods vehicles). We recommend the ND WSE-80hd with a height of 80 mm and compressive strength of > 1,050 kN/m² for trafficable roofs.

Technical data

Water retention elements
Height
Compressive strength
Water retention
ND WSE-50hd
approx. 50 mm
> 1,050 kN/m²
approx. 47 l/m²
ND WSE-80hd
approx. 80 mm
> 1,050 kN/m²
approx. 76 l/m²
ND WSE-100hd
approx. 100 mm
> 700 kN/m²
approx. 95 l/m²
ND WSE-150hd
approx. 150 mm
> 500 kN/m²
approx. 143 l/m²

Example composition

Pavement

Laying course

Sub-base layer

ND FV-300 Filter Geotextile

ND WSE-80hd Water Retention Element

ND TSF-100 Slip and Protection Sheet

ND TGF-20 Separation and Slip Film

Waterproofing membrane

depending on load class
depending on the chosen system
from approx. 429 kg/m²
n/a
Cs = 0.09 l/s - 3.08 l/s

One complete system

Our water retention systems for trafficable roofs are supplied complete, from slip and protective layers (ND TGF-20 Separation and Slip Film and ND TSF-100 Slip and Protection Sheet), water retention element up to and including the filter layer.

In combination with the ND AFC-100 Adjustable Flow Control (adjustable to reduce the water flow to 0.04 l/s), this system forms the best basis for any water retention system for trafficable roofs. The water discharge is adjusted to the calculated discharge values by turning the adjustable pressure regulator to the desired position and setting it equal to the discharge coefficient table.

Generic filters
Exact matches only
Filter by Product categorieën
Root barrier layer
Water buffering and water retention layer
Trafficable roofs
Vertical protection and drainage layer
Vegetation layer
Solar roofs
Growing medium layer
Roof edge / edge retaining profiles
Filter and drainage layer
Separation, protection and slip layer
Filter layer
Green roofs
Sedum cassettes
Erosion protection
Water retention
Inspection chambers
Generic filters
Exact matches only
Filter by Product categorieën
Root barrier layer
Water buffering and water retention layer
Trafficable roofs
Vertical protection and drainage layer
Vegetation layer
Solar roofs
Growing medium layer
Roof edge / edge retaining profiles
Filter and drainage layer
Separation, protection and slip layer
Filter layer
Green roofs
Sedum cassettes
Erosion protection
Water retention
Inspection chambers
Generic filters
Exact matches only
Filter by Product categorieën
Root barrier layer
Water buffering and water retention layer
Trafficable roofs
Vertical protection and drainage layer
Vegetation layer
Solar roofs
Growing medium layer
Roof edge / edge retaining profiles
Filter and drainage layer
Separation, protection and slip layer
Filter layer
Green roofs
Sedum cassettes
Erosion protection
Water retention
Inspection chambers
Generic filters
Exact matches only
Filter by Product categorieën
Root barrier layer
Water buffering and water retention layer
Trafficable roofs
Vertical protection and drainage layer
Vegetation layer
Solar roofs
Growing medium layer
Roof edge / edge retaining profiles
Filter and drainage layer
Separation, protection and slip layer
Filter layer
Green roofs
Sedum cassettes
Erosion protection
Water retention
Inspection chambers