In these cases, plaster should be repaired. Plaster repair is a cracking of cracks, the extinguishing of exfolved plaster, partial plaster in the wall after cleansing the damaged areas, a cut of the plaster and the removal of the tank. Before starting the repair, it is necessary to make a flaw detector, tapping the entire area of the plaster. If the plaster is strong enough, then when tapping it will make a dull sound. If she is poorly held and exfoliated, then the sound will be more booming and high. In this case, the plaster must be beaten off with a hammer to places that hold tight. After that, you should look at the state of the surface and prepare it depending on the work that is planned to be done. If a layer of plaster is more than 5 cm, then you need to fill the plaster mesh.