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First, the definition of metal roofing metal roofing sheet metal is used as roof material, the structure layer and waterproof layer into one of the roof form. Many different types of sheet metal, zinc plate, galvanized plate, aluminum plate, aluminum-magnesium alloy plate, titanium plate, copper, stainless steel panels. Thickness of 0.4 ~ 1.5mm, the surface of the general board for coating processing. As the quality of different materials and coatings, and some panel life of up to 50 years. The production of a variety of plate shape, and some composite panels, about two layers of insulation composite sheet metal in between, and some for the board, the construction, some panels in the plant is completed on-site assembly, according to some roofing projects require on-site processing. Insulation and some good in the factory compound, can also be produced in the field. So the sheet metal roof forms, from large public buildings to factories, warehouses, housing, etc. are used. Therefore, sheet metal roofing specification scope is waterproof grade I ~ III-class roof. Second, the volume of metal roofing type of roof joints sealed together design, production and design of the construction site with the same length of roof, installed after the roof construction without its connection, and there is no exposed screws, except to ensure the appearance of the building roof integrity, both Premium Waterproof ...