In waterproof material variety, is currently building waterproof materials can be divided into five categories: namely bitumen membrane, waterproof polymer sheet, building waterproof coatings, building sealants and seepage, such as special-purpose waterproof material. Each material has its own characteristics, so the project must be based on site conditions, the environment, architectural level, functional needs, the choice of appropriate materials, play to the characteristics of various types of materials, and thus obtain the best waterproof effect. Depending on the project site to the selection, the choice of flag is also inconsistent. (1) Roof. Roofing due to prolonged exposure to the sun, snow and rain erosion directly, winter heat temperature changes, retractable roof will occur between day and night, so you should choose a good anti-aging properties, and there is some elongation, heat and high material . Such as polyester fetal modified bitumen membrane, EPDM sheet or asphalt felt like. (2) the ground. According to long-term underground project in a wet state and difficult to repair, but small changes in temperature and other characteristics, it requires the use of rigid-flexible multi-channel fortification, in addition to rigid waterproof filling additives, but also the choice of resistance to mildew, good corrosion resistance, life length of flexible material. When the cushion waterproof, puncture resistance should use good material, such as the thickness of 3mm or 4mm of tread fiberglass, polyester fetal modified bitumen membrane, glass cloth felt like; when using waterproof polymer substrate , you must use good water resistance adhesive thickness of the substrate should not be less than 1.5mm; use waterproof paint film fast when you need to use, and then emulsifying the material does not produce. Such as polyurethane, silicone rubber waterproof coating having a thickness of not less than 2.5mm. (3) toilet and bathroom. Toilet and bath are generally small in size, the yin and yang angle and more, and all kinds of wear too much floor pipes, coils, sheets of construction difficulty, use waterproof coating is appropriate, the coating can form a seamless whole film, from the base surface irregularities, such as the JS composite waterproof coating, asphalt catch small latex paint, polyurethane waterproof coatings. To wear a floor pipes, the choice of green or water-swellable rubber seal deals.