Dig excellent permeable crystal waterproof, you can do it yourself.
For the cement surface, use the super permeable waterproof guard to waterproof (if there are cracks on the cement surface and the cracks are incomplete, fill them with Meiding porcelain glue before waterproofing).
For the surface of ceramic tile, first check whether the filler in the gap of ceramic tile is complete (if the filler in the gap of ceramic tile is incomplete, fill it with Meiding porcelain glue and then waterproof it with Shi Zhuan waterproof guard).
Transparent waterproof repair adhesive can be used for waterproofing of exterior wall coatings.
Products will penetrate into the grass-roots level, making the grass-roots level waterproof. It is recommended to build the product in a dry place. The drier the substrate surface, the deeper the product penetration. If the base surface is full of water and the density is high, the material cannot penetrate well. Regarding the principle of waterproof and plugging, the source of water leakage is not blocked, and water only penetrates into the wall for a long time. When water reaches a certain level, it will leak out from other parts of the wall. Can't solve the fundamental problem. Only by spraying waterproof agent on the roof or outside the wall, so that water can not penetrate into the wall and flow away directly, can the problem be completely solved.