Steel structure fireproof coatings are divided into indoor fireproof coatings and outdoor fireproof coatings according to their application sites; According to the coating thickness, it is divided into thick, thin, and ultra-thin fireproof coatings. Thick steel structure fireproof coating refers to coatings with a thickness of 8 mm to 50 mm, and the fire resistance limit of this type of fireproof coating can reach 3 hours. The bottom layer construction method

a. When applying fireproof coating to steel, H-beam, and rectangular steel with a width of less than 300mm, the base material should be roughened before the fireproof coating can be applied; b. When applying fireproof coating to steel, H-beams, and rectangular steel with a width of over 300mm, mesh treatment must be carried out before applying the fireproof coating. Steel mesh or metal mesh can be selected and fixed with welded steel bars or bonded insulation nails