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In this paper, the present situation of roof waterproof technology was discussed and the working principle and failure reasons of roof waterproof system were analyzed. Combined with the actual high-rise building project, the key technologies of roof waterproofing design and construction have been discussed in detail. Keywords-high rise building; roof waterproof; construction technology; inverted roof I. DEVELOPMENT OF ROOF WATERPROOF TECHNOLOGY Roof leakage is a common quality problem in building engineering, and it is a difficult problem that has not been solved well. In recent years, with the continuous development of computer, microelectronics technology, new energy and new materials, waterproof construction technology of building has become more scientific and reasonable, new waterproof material also shows a gradually diversified development trend. Glass fiber reinforced cement (GRC) is a new material with high strength and light weight, which can effectively improve the crack resistance of concrete. Rigid polyurethane foam is a kind of building material with waterproof and thermal insulation function. In the United States and Italy, the main building waterproof materials using self-adhesive polymer modified asphalt waterproofing membrane and three ethylene propylene rubber membrane. In recent years, the research and development of polyethylene polypropylene fiber composite waterproofing membrane performance is also very good, with strong impervious capacity, high tensile strength, low temperature flexibility, stability, non-toxic and other performance characteristics. For example, some spray polyurea elastomer spray has been developed by China National Institute of Oceanography. This kind of material has reached the world advanced level, which has the characteristics of wear resistance, high strength, corrosion resistance, ageing resistance and so on. In the construction of roof waterproof technology, the transformation from single waterproof material to composite waterproofing of coil and film has been gradually realized in China. Rigid waterproof and flexible waterproof has been combined to achieve complementary advantages. In the past, the waterproof layer was arranged above the insulation layer. But now, the waterproof layer is arranged below the insulation layer. This new roof is generally known as the inverted roof. In the construction of waterproof coating, how to speed up the film curing speed and control the film thickness becomes the key technology. In membrane joint construction, there are some new technologies such as hot melt method, hot air welding and heat welding method. II. ROOF WATERPROOFING TECHNOLOGY At present, the waterproof technology adopts the principle of rigid and flexible combination, compound waterproof, multiple defense and integral sealing.

Analysis of the Key Technologies in Roof Waterproof Design and Construction of High Rise Building