Analysis:

Many people believe that cracking on exterior walls is a problem with the paint application. In fact, this is not the case. This is because the wall cracks were not solved in time, which led to a series of problems in the later period.
As far as exterior wall decoration is concerned, the causes of cracks include: cracks caused by differential settlement of buildings, temperature stress cracks, dry shrinkage cracks, etc.
1. Cracks caused by differential settlement of buildings: Uneven settlement of buildings can cause additional stress within the structure. In addition, the linear expansion coefficients of various materials are very different, which leads to the possibility of cracks.
2. Temperature stress: When the temperature difference changes greatly, the thermal expansion coefficients of different materials are different. This results in different expansion and contraction changes, leading to the possibility of temperature stress cracks.
3. Drying shrinkage cracks: The shrinkage rate of wall materials other than clay bricks after drying is much greater than the shrinkage of brick and earth brick walls. Drying shrinkage will produce greater stress when the stress is relatively strong. When the strength of the cement mortar is insufficient, the adhesion is poor, or the mortar joints are not full in certain areas, cracks will appear on the wall. Such cracks are generally relatively small.

Solution:

1. Cell buffering: The wall is divided into relatively independent units through cells. The dividing seam in the middle is treated with special putty. Isolate blocks from each other to avoid mutual influence, thereby playing the role of partition buffer.
2. Civil construction control: During the civil construction process, the plastering thickness, cement mortar proportion, and sand particle size are controlled. Especially the control of the construction process of non-clay bricks, such as the waterproofing before and after construction of fly ash bricks, aerated bricks, etc., and the width of ash joints during construction is strictly controlled between 8-12mm. The saturation of mortar joints must be controlled at 100% and should be strictly controlled. Eliminate the possibility of cracks.
3. Crack-resistant mortar layer buffering: Interlayer buffering is a very important link. Even though the strength of the crack is controlled by standard anti-crack mortar and fiberglass mesh. It has also become the end of a strong crossbow. through buffering between layers. The cracks can be completely blocked in the anti-crack mortar layer. Make it impossible to work on the surface layer.
4. Process control: Control the thickness of putty during construction to completely eliminate the source of cracks.