Roof waterproof engineering is an important part of architectural engineering, waterproof engineering quality is good or bad, a direct impact on the life of buildings and structures, aﬀecting people’s normal life order. “The Construction Engineering Quality Management Ordinance” provides for the roof waterproof engineering warranty period of 5 years, showing that the quality of roofing works is an important part of the civil housing construction. Its main role is to meet the user on the housing drainage, waterproofing, heat insulation, thermal insulation requirements. Roof cannot have leakage and water phenomenon, while the roof should also make the roof after the landscaping function. Roof construction quality is good or bad, the pros and cons are related to the life of the building. If... the roof of water leakage, water seepage, people will bring a lot of inconvenience to life, not only cause serious economic losses, but also directly aﬀect the people's normal life. So to ensure the quality of roof engineering, design is the premise, the material is the foundation, construction is the key, and maintenance management is guaranteed. Only the strict material oﬀ, well-designed, carefully construction, in order to ensure the quality of roofi ng works in order to give users to create a good living or working environment.