What's the crack in the wall?

The reason for cracks in houses is temperature cracks: for masonry structures, there is mutual constraint between floor and masonry. If the external temperature changes and the temperature between floor and masonry deforms, masonry will produce temperature stress; Cracks in latex paint: If the surface paint film cracks, polish off the cracks with fine sandpaper, and then brush the latex paint again. Structural cracks: the expansion joint between the structural wall and the brick wall will extend to the wall surface, which is also a crack formed by latex paint. Cracking of putty layer: this kind of cracking is the slightest cracking, which is caused by too thick or too thin putty layer.