1. Waterproof gypsum board Waterproof gypsum board is a lightweight decorative board with a certain amount of waterproof agent added to the gypsum core material to waterproof the board core and protective paper to make them reach a certain waterproof standard. The surface water absorption rate of waterproof gypsum board is ≤ 160g/m2, and the water absorption rate is about 5%. This kind of board can generally be used for space decoration with large space and high humidity. Waterproof gypsum board has the advantages of sound insulation, heat insulation, heat preservation, fire prevention, convenient installation, good constructability and low price. Light steel dragon skeleton is generally used for installation and construction, and rust prevention should be paid attention to during construction, and antirust paint should be brushed for hanging poles. Second, the aluminum gusset aluminum gusset plate is a new type of ceiling material, which has the advantages of fire prevention, moisture prevention, anti-corrosion, anti-static, sound absorption and sound insulation. Common shapes are rectangular, and the surface is flat and perforated. The difference between the two is mainly in hardness. Microporous aluminum plate, also known as concealed gusset ceiling system, has flat surface, thin joints and simple and generous design. The standard specification of microporous aluminum plate is 350 x 350 mm, and the inspection of aluminum gusset plate mainly depends on the gloss thickness of paint film.