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
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
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.
