The gypsum ceiling is cracked. What caused it? How to solve it?

first of all, we should make it clear that it is not the whole gypsum board that is easy to crack, but the joints between gypsum board and gypsum board or between gypsum board and other materials are easy to crack. Then let's see what causes the gypsum board to crack and the corresponding precautions. Material selection: We always use keel when choosing gypsum board ceiling, and light steel keel is the best. Gypsum board ceiling can be divided into main keel and auxiliary keel. Considering the endurance and long time of the ceiling in the later period, the materials must be qualified. At the joint between gypsum board and gypsum board, double gypsum board should be made, and a gypsum board strip larger than the crack should be added above the joint. Wait a moment, after plaster is leveled, stick caulking tape and putty to level it up.

it is caused by too thick or not dry repainting, too loose or rough substrate, and the primer and topcoat are not matched. Repair paint film should not be too thick at one time, and the previous paint film should be dried before repainting. When the substrate temperature is lower than 5℃, latex paint should not be applied, and primer and topcoat should be used together. Cut a splayed mouth with a wallpaper knife and brush the glue to deal with the dust caulking. After the construction is leveled and dried, stick a kraft paper anti-crack bandage. After the drying, blow the putty and polish the wall. First, repair the local brush. Finally, brush the whole top to ensure that all the top surfaces are the same color. The ceiling gypsum board is cracked, which should be installed by a single gypsum board. It does not rule out the hidden injury caused by handling and turning, and it will also crack due to various factors such as thermal expansion and contraction for a long time. If a wooden board is used as the base before plasterboard, this situation will not occur, and the cost will be higher.

this kind of crack usually occurs when the ceiling is not specially treated, and it is also troublesome to maintain it, especially if the painted latex paint changes color after a long time, so it is necessary to brush all the top surfaces after maintenance. It can break the thermal expansion and cold contraction of steel, not to mention gypsum board and putty layer, and it can be easily cracked. The shrinkage rate of light steel keel is roughly the same as that of gypsum board, and cracks can be avoided as much as possible by using light steel keel gypsum board ceiling.