Repair the cracks on the wall, look at the corresponding seepage area of the outer wall, and see if there are obvious cracks. If there are small cracks, directly apply waterproof glue twice and brush the external wall twice. Pay attention to brush the waterproof glue above the water seepage part, and it is not necessary to brush below the water seepage part. If the external wall surface is treated, if there is still water seepage, then the leakage of the roof must be considered.
If there are big cracks, it is necessary to check whether there are cracks between insulation boards or whether the original putty layer is cracked. If the original putty layer is cracked, it is necessary to shovel putty around the crack, scrape the mortar of the external wall crack and stick it on the grid, scrape the elastic putty of the external wall twice, and dry it in exterior paint before drying.
Extended data:
Precautions:
1. Another key to external wall waterproofing is to seal doors and windows. Before the installation of doors and windows, the size of doors and windows must be checked, and the large deviation of size should be handled. In general, the width of the joint between the border edge and the hole is about 20 mm
2. After the window frame is fixed, polymer waterproof mortar shall be used for caulking around the window frame. Brush a layer of cement waterproof mortar before caulking to facilitate mortar bonding. Sealing should be dense and full, and there should be no light transmission. After checking the sealing quality, the plastering construction around the window frame can be continued. Drip line must be made for the window cover ceiling board painted with cement mortar.
3. After the ceramic tile is pasted, tick off the seam in time, and tick off the seam with 1: 1 polymer waterproof mortar. Generally, the joint width is about 8mm, and the jointing sequence must be carried out both horizontally and vertically. The joint is in the form of concave joint, which is 2mm ~ 3mm lower than that of ceramic tile. After jointing, check that there are no defects such as hook leakage, wipe the brick surface with cotton silk, and finally spray water for several days.
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