The main reasons for the cracks in the wall are as follows:
The wall is too thin.
the cement paint is applied on the wall before it is completely dried, and cracks appear in the cement of the wall.
structural problems of the original building
it is too stuffy in the top-floor residential house
the joint of the "insulation board" of the wall cracks
cracks appear at the overlap of the old and new walls.
The joint between the trunking and the original wall is cracked after grooving by the plumber
Treatment method:
1. If cracks appear in a large area, chisel the basement of the cracked wall into a "U" shape, and the spacing between the "U" grooves is more than 2CM, and roughen the chiseled basement before hanging steel wire mesh.
2. After the wall base is cleaned, first stick a layer of dacron cloth, kraft paper or newspaper on the wall, and use the tension of fibers to ensure the integrity of the latex paint film. This method is relatively simple, but the effect is average.
3. Remove the insulation board on the wall surface, or remove the cement wall surface. Install a layer of gypsum board or "five-inch board" outside the insulation board, and then make latex paint on it. This method can remove all irregular cracks, and the cracks are generally the joints between plates, which is easier to handle. However, this method is expensive and difficult to construct.
4. Use elastic decorative materials. At present, there is a kind of "elastic putty" which can make up for the problem of wall cracks to some extent. Some kind of wall paint can also cover the tiny cracks on the wall. However, the "elasticity" of these materials themselves is small, so they will not work on the wall with severe cracks.
6. The wall of the construction hole in civil engineering is post-built. If it cannot be naturally connected with the original wall, cracks will occur, so the tile