There are five reasons why vertical joints are open:
The first is that there are cracks in the insulation layer of the original house, which leads to cracks in the wall after decoration;
The second is that the wall surface is repaired and painted improperly after grooving, and the shrinkage causes the wall surface to crack;
The third is that the proportion of cement is inaccurate when plastering, and it is easy to crack when the proportion is high;
The fourth case is that the proportion of wall putty is improper or uneven;
Fifth, the ratio of latex paint to water is inappropriate, and these irregular operations will lead to wall cracking.
There are two reasons for transverse slit:
1. Improper handling of construction joints during concrete pouring.
2. When pouring concrete, the vibration is not in place, which leads to cracks in the process of concrete solidification and hardening.