First, the base layer can be started without waterproofing.
The base layer has strong water absorption and absorbs the emulsion component in the waterproof coating, so that the waterproof layer after drying is prone to defects such as powdering, no strength, and pinhole. It is recommended to spray water to wet, and some base surfaces even need to be rubberized.

Second, the waterproof layer is not cured, the water shut-off test is carried out.
After the waterproofing is done, only the water shut-off test is carried out. When the waterproof coating is not cured, the waterproof layer is still in the reaction. Putting the water into the closed water test will damage the waterproof layer and easily cause the waterproof layer to rise and fall off. The closed water test is qualified, and the ground layer is first made of protective layer. After the sanitary ware is installed or the tile is fully cemented, the water storage experiment is tried again to check whether there is secondary damage to the waterproof layer during the paving process.

Third, waterproof as long as you brush 3 times, no thickness requirements
Or disposable brush too thick brush waterproof not only have the requirements of the number of times, cross-painting direction requirements, the thickness of each pass is more important, even if the closed water test does not leak, because it is too thin, can not be used; specification requirements : The thickness of the ground waterproofing film should reach 1.5mm. In fact, many families have failed to do so.

The coating is too thick at one time, and the surface of the coating is not dried after the surface is dry and solidified. When the water vapor volatilizes, it may cause foaming or even cracking. Especially in the corner of the corner, it is easy to pile up and cause the above problems.

Brush waterproof must be brushed over and over again according to the process requirements, and then dry it again and then brush it again. If you want to save trouble, pour the waterproof on the ground and shout it. The parts are thick and thin, and the drying speed is definitely different. The surface of the thick place is dry, and the bottom is still mushy. Once the water is closed at this time, the waterproofing is equal to white.

Fourth, do waterproof directly on the layer
This kind of brushing and waterproofing is a hidden danger. Even if it is coated with waterproof paint, it is the weakest place; many household brushes do not level the original wall pulling layer before waterproofing, and directly brush the burr If the burr is broken, the inner position is a small hole. Therefore, in the brushing layer, the first step is to smooth the burr, so that it is not necessary to smash the hand. If there is an empty drum in the layer, it is necessary to shovel the empty part.

Fifth, the grassroots layer is not handled well, direct brush waterproof
If the base layer is hollow, sanded or cracked, the base layer is treated first and then fully dried, and then waterproofed, otherwise it will affect the waterproof quality and life.