One complete system
Our extensive green roof systems are supplied as complete packages – from the root barrier up to and including the vegetation. We grow our own vegetation at our sedum nursery, Sedumdirect, offering excellent quality. 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.