... 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 ... , bridges, channel tunnel, planted roof, waterproof and drainage system, pools, dam, irrigation system, light steel roof ect. Item N L W N ...