Polyurethane waterproof coating waterproof material is oily, so before the construction must confirm whether dry or waterproof finish, moisture is wrapped inside, through the steam into the power of sunshine, causing peeling polyurethane waterproof layer.
2, material inferior
Due to the low barriers to entry, price competition and other issues of waterproof materials, the production of domestic manufacturers in the polyurethane waterproof material on cutting corners, which makes itself waterproof coating property decreased, resulting in the failure of waterproof
3, the base is clean
Waterproof construction before the important job is to clean up the base, construction of polyurethane waterproof coating can not be avoided, so doing waterproof construction must take before surface cleaning up quickly, ensure no floating dust, sand and other loose surface material, otherwise there will be a waterproof layer and base layer unstable phenomenon, so as to cause leakage.
4, lack of construction experience
Waterproof construction is the best waterproof professional construction team to operate, can not go to the hardware building materials line to buy some waterproof materials to paint. Waterproof cast before the need to carefully determine the cause of leakage, and then to be resolved.
5, the waterproof layer thickness control
Polyurethane waterproof layer must reach a certain thickness to have waterproof effect. The polyurethane material itself is still relatively low absorption characteristics, if the thickness of waterproof layer is not enough, the rain through the polyurethane waterproof layer to the bottom, the sunshine will produce water vapor at the bottom, causing the waterproof layer peeling. At the same time, polyurethane waterproof coating is not painted as thick as possible, because the polyurethane waterproof coating is easy to produce carbon dioxide and other gases in the reaction during the film forming process, if the coating is too thick to produce bubbles, thus affecting the waterproof effect.