J-Drain GRS is a pre-assembled greenroof drainage system, consisting of a high strength plastic core & two layers of geosynthetic fabric attached top and bottom. Advantages of JDR Green Roof System:    Lightweight and easy to install  High strength and crush resistant  High flow capacity Built in water retention chambers  Pre-assembled as a system  Low cost Reduces weight of total system by eliminating sand and gravel Prevents roof penetration into drain layer Filters fine particles & ensures drainage efficiency  Advantages of Green Roofs:    Reduces rainwater run-off Reduction of structure’s heating & cooling costs Protects roofing from UV degradation Additional use of space Reduces heat island effect  Reduces sound levels Absorbs carbon dioxide Produces oxygen Provides wildlife habitat		Green Roof Tutorial