The newly decorated roof is peeling off. What caused it?

A demoulding layer is left on the surface of the cement layer on the roof. When the floor is cast in place indoors, the floor is cast by supporting plates, laying steel bars and cast-in-place concrete. In order to facilitate the separation of the floor structure from the support plate, a release layer will be coated on the support plate. In summer, it is like a steamer; Especially the ceiling, if it is noon, the indoor ceiling is very hot. Continuous high temperature can easily evaporate the glue in the ceiling layer and putty until it loses its glue property; Of course it has to cause peeling.

Looking at falling off, the top surface is not finished putty. If the finished putty and latex paint foam, the base inside will not fall off. Now the construction is finished putty, which is as hard as cement after drying and is not easy to fall off. It may be that the painter blew putty at that time, did not handle the grassroots properly, and did not roll up the wall firmly. When there is dust on it, he directly daubs putty, which is easy to peel off after a long time. Basically, it is scraped and leveled with putty. The plastering gypsum used before has basically been replaced, so it is not recommended to use plastering gypsum for leveling. Therefore, the putty layer is a common leveling layer for roofing. Water seepage and alkali resistance treatment are needed before batch scraping putty can be carried out. Anti-alkali phenomenon needs oxalic acid comprehensive roll coating treatment. Choose waterproof putty to scrape the wall in batches.

Construction quality problems, poor quality of putty powder during construction, too thick gypsum leveling layer during top surface construction, or too thick putty layer are easy to cause the putty layer to crack and empty, and then fall off. Post-treatment method: gently tap the peeling part and its surroundings with something to see if there is an empty drum. If yes, shovel all the empty drum areas to the end. Then, paint the wall, if there are cracks between the floors. First of all, we should find out the reason for the shedding, which is that the base material was not cleaned during construction, the paint quality was not good, or the brush thickness was too thick. In practice, most of them are caused by water leakage upstairs. Then contact the property and find the owner upstairs together.