The Green retention roof system is capable of storing from 80L/m2 and this amount can be increased depending on the system selected. A space can be built on a no slope extensive roof between the vegetation layer and the roof to store a certain amount of rainwater. To create this space, special spacers are installed under the vegetation layer. The roof drain is equipped with a damming element which slowly disperses the water into the drain through a small adjustable hole. This solution makes it possible to retain water on the roof in a much larger quantity than on a standard extensive roof, and gives the possibility to program the time of emptying this space.
The system combines the advantages of low maintenance with effective rainwater and snow-melt management. Rainwater can dam up to a certain height and run off through an overflow hole.
In addition to the extensive Sedum Carpet system, other forms of greening are also possible, including an intensive green roof with a specific substrate layer.
| system height | from 150mm |
| system weight | from 155 kg/m2 |
| water capacity | from 80 l/m2 |
