During construction, a material such as foam is often used. At a price such material is available to almost any segment of the population, therefore it is widely used in construction and in the interior decoration of premises. You can also use Styrofoam to repair the ceiling. In order to paste over the ceiling surface, use foam tiles. Its dimensions, like the dimensions of ordinary tiles, are fifty by fifty centimeters. There are two ways to lay foam tiles. — laying in a straight line. You install the tiles, starting from one edge of the ceiling to the other, going parallel to the walls. — laying diagonally. With this type of installation, you start from the center and work your way to the edges, and if necessary, you can trim the tiles that come from the edge if they do not fit. By the way, mortise locks are now very popular, all experts recommend installing them..
Before pasting the ceiling with these tiles, first clean its surface from the old design: plaster. Then prime it. If the old plaster is not removed, the foam can flake off after a few days of use. Special glue is usually used for laying the tiles, but this is not necessary. You can make a solution that will perform a function no worse than glue. Mix putty, water and PVA. Apply this mixture to the tiles all over the surface and then apply it to the ceiling. After two or three hours, as soon as the glue is completely dry, work the seams and wipe them with a damp cloth.