Open terrace polyurethane bitumen membrane 3mm sheet laying RVS WATERPROOFING CONSTRUCTION CHEMICAL APPLICATORS.Terrace waterproofing is a process of applying a protective layer of waterproofing membrane to prevent leakage from the terrace to the below floor.The membrane not only prevent water leakage from the terrace but also helps in preventing the formation of tiny fracture and tiny cracks on the surface in future and Rvs waterproofing in Tiruchirappalli.