/Related knowledge:
1, the roof is damp. Once the roof is wet, putty powder is easy to peel or fall off. The main reason is that the roof leaks, the insulation effect is poor, and the condensed water falls off due to moisture.
2, construction quality, in the construction, putty powder quality is poor, the adhesion is not enough, or in the construction, the glue and putty ratio is wrong, leading to cracking and falling off.
3. Improper plastering, such as the plastering layer is too smooth and no interfacial agent is used, which leads to poor adhesion between putty and wall. Another point is that the roof will powder and fall off if the house lives for a long time.
4. In order to prevent the putty powder from falling off and cracking, first clean up the dust and impurities at the grass-roots level, then remove the excess concrete and re-polish it.
5. If the flatness is not enough, it should be filled with mortar, not directly leveled with putty powder, which will easily make the putty too thick and lead to cracking.
6. After the putty construction is completed, you must wait until it is completely dry before proceeding to the next step. It's best not to form at one time, it's too thick to dry easily.