... effective age can be more than 20 years.If the pvc membranes used on no-exposed surface, it can reach 50 ... UV-resitance, no pollution to environment 4).Root-resistance: The pvc membranes can be used on planting roofs. 5).Used for ... construction, subway, bridges, channel tunnel, planted roof, waterproof and drainage system, pools, dam, irrigation system, light steel roof ect. Item N L W ...