Drowning Outline and the current system of a traditional building of the water systems generally use cement pouring gutters or naturally fell into the water. b Ministry of Construction "building water supply and drainage design specifications" provides the building should be a separate storm sewer discharge, and the detailed structure of roofing construction made detailed requirements; only the roof gutter, gutters, the water inlet, water pan , Deformation and extending pipelines waterproof roof structure of each detail has a specific structure and size specifications, but also for the use and quality of waterproof material, there are stringent requirements. c difficulty directly determines the design and construction of the high cost of cement gutters, inefficient. Roofing waterproofing roofing project structure is most likely to leak weaknesses appear. Traditional water system issues a cement gutter design complexity, construction difficult, long duration. b traditional way overboard susceptible to corrosion of the wall, it will destroy the housing wall in the short term, affect the appearance. c prone to leakage, affect housing use functions, is the weakest link in the roofing project. d for the designer, the builder, property management, the user in terms of a relatively new type of headache for the water system is the basis of the requirements of a material design is the premise b c d construction is the key to safeguarding the environment should be simple and coordinate e Ruichen Hangzhou Building Materials Ltd.