How to prevent cracks at the corner of ceiling in decoration? Installation technology and matters needing attention of artificial stone countertop?

solution: whether the gypsum board in the cracked part belongs to a cross joint or a straight joint before construction, and the gypsum board is fixed by overlapping with staggered joints during construction. If the cracking part is at the right-angle junction, it is the result of uneven stress; The whole gypsum board at the right-angle handover part draws a right-angle shape, that is to say, there is no joint at the right-angle part, and the joint stays at the straight ceiling part. The phenomenon of falling off belongs to the poor treatment at the grass-roots level. Before scraping putty, brush the interface agent and do grass-roots treatment. First, fill the joint with caulking putty. Pay attention to make the caulking putty enter the gap, not just the surface. The surface should be flat. When it is dry, put a bandage at a right angle to the gap. The white latex with bandage must be a good quality product. Then batch of putty, polishing and rolling latex paint. Methods to prevent cracks in gypsum board ceiling: improper practices 1. When the ceiling elevation is the same as the beam bottom elevation, gypsum board does not pass through the beam bottom, which will lead to high maintenance rate and bring a lot of inconvenience. Because the ceiling elevation is the same as the beam bottom elevation, gypsum board does not pass through the beam bottom, which will cause the interface between gypsum board and beam bottom. This interface will be cracked due to temperature difference and expansion and deformation of different materials during use. If it is not handled properly in the later stage, the cracks will crack repeatedly, which will bring a lot of inconvenience to the owner's life. 2. The corner of ceiling gypsum board is sealed with gypsum board without L whole board, which is easy to shrink and produce cracks. When the wooden keel ceiling is sealed with gypsum board at the corner, if the L whole board is not used for construction, the bottom gypsum board will have a joint at the corner, which will cause cracks due to the interface of the basic material and the easy shrinkage of the material. Correct practice 1. When the ceiling elevation is the same as the beam bottom elevation, gypsum board must pass through the beam bottom. The advantage of this is that there is no interface, which will effectively reduce joints and prevent cracks. In addition, gypsum board should pass through the lower part and side of the beam when dealing with the ceiling elevation and the horizontal opening of the beam. Leave the joint on the side, so that there is no bottom plate in the joint, which will reduce the crack and maintenance rate. 2. The corner of the ceiling wooden keel is sealed with L-shape to prevent cracks. When the wooden keel ceiling is sealed with gypsum board at the corner, the L-shaped whole board is used for construction. The gypsum board at the bottom is an L-shaped whole board at the corner. The joints are left on both sides of the ceiling and made into a figure of eight, and then the joints are filled with Lafarge or gypsum powder, which can effectively control the occurrence of cracks.