PVC Roofing Membraneof unreinforced type (H) is a good material for green roofing waterproof. The material itself has superior physical and chemical properties to provide waterproofing function & prevent from root penetration, while other bitumen membranes need special chemicals. The flexible membrane is non-flammable but has good wielding property, and easy to install on complex substrate together with terminal bars, sealants and other accessories.