The Finesse Roofdrain consists of a root and water permeable geotextile filter, thermally bonded on the flat side of a perforated cuspated High Density Polyethlene core. It is primarily intended for use under thin soil layers where the plant roots can reach down to the water in the core reservoirs. The core is perforated to allow the excess rainwater to flow into the underside and away along the Roofdrain to the outlets. Its major application is in extensive roof garden drainage where Roofdrain provides a lightweight drainage layer and water reservoir to sustain plant growth.