Due to its advantages of light weight, high industrialization, fast construction, short period, excellent comprehensive economic benefits, good seismic performance, environmental protection and beautiful appearance, light steel structure has developed rapidly in recent years, and has been widely used in various industrial plants and civil buildings, but it also brings some new problems in use.Because the roof of light steel structure is mainly composed of color profiled steel plate and color steel plate sandwich plate, this kind of plate has the characteristics of light weight, high strength, rich color, convenient production and installation, fast construction, good seismic performance, fire protection, waterproof, durable, maintenance free, etc., its body has certain strength, rigidity and corrosion resistance, and it generally has no possibility of water leakage.However, if the joint between the plates is not handled properly, it often causes water leakage on the roof.Therefore, the connection of roof color steel profiled sheet is the most important link in the roof system. We must attach great importance to the design, material selection and construction of color steel roof.

Reasonably determine the roof slope.Standardize roof drainage design

 In terms of design, first of all, the design specifications shall be strictly followed, and the design indexes shall not be arbitrarily reduced due to cost saving. At the same time, the design shall be combined with the actual situation of the construction site.For areas with heavy rain and snow, when the building roof span is large, the roof slope should not be less than 10%.In designing roof purlins, we should be more conservative, not blindly saving steel, but reducing the height of purlins.The purlin height is taken as the high value, which is beneficial to prevent uneven downward deflection of the roof and water on the roof area.