What are the causes of cracks in the wall?

Cracking of the wall may be caused by moisture on the wall, which is easy to occur in the south, and the wall needs to be waterproofed.

Generally, this situation may be due to poor technology during construction, and the biggest reason should be that the wall has water pipes, which are very damp and will make the wall crack.

It may be that the waterproofing of the wall at that time was not done well, and when the weather is wet, it will cause the wall to crack.

It may be that the foundation of the house was not laid when it was built, or it may be because the environment is relatively humid, or the temperature changes greatly, resulting in cracks in the wall.

It may be because the interior is relatively humid, or there may be some mistakes during the decoration, and of course, there may be problems with the materials.

It may be that your house was not done well at the beginning, and it was not dried, followed by the quality problem.

Sometimes it's because of the problem of the decoration paint itself, or because it is not properly painted, or because it has not been maintained all year round.

It may be because the decoration is not done well, or because of the house itself, it is recommended to pay attention to it.

Nowadays, many people live in a new house soon after finding that there are cracks in the wall, although this is a very common decoration problem, but most people are very clear about the cause of the wall cracking. So, let's take you to understand what are the main reasons for wall cracking and how to deal with wall cracks.

The main causes of wall cracking are caused by uneven settlement of the foundation, temperature changes, material reasons, and construction reasons. Among them, the cracks caused by the uneven settlement of the foundation are more common in life, because all the loads of the house cover house are transmitted to the foundation through the foundation, and the stress has the effect of diffusion, so the phenomenon of uniform settlement causes the cracking of the wall.

Wall crack treatment scheme.

1. Grouting reinforcement party and auspicious method.

If the grouting reinforcement method is used to deal with the wall cracks, first of all, the cracks should be fine, the number should be small, and the cracks should be basically stable, so that this method can be used to deal with them. The grout reinforcement method is to use the same material to make two or four tested masonry columns. Then it is divided into two groups, one group is used for press fracturing, and then grouting, and then the two groups of masonry columns are compared with the failure test, if the comparison result is that the strength of the masonry reinforced by grouting is about the same as that of the original masonry, then it is qualified.

2. Embedding method.

If the wall crack is treated by the embedding method, the crack must be relatively large, and the number cannot be large to be treated by this method. When repairing wall cracks with the embedding method, you can first use high-grade mortar and fine steel bars to fill the ash joints where the cracks intersect, but you can also use the block embedding method to deal with it, that is, at both ends of the cracks and the position in the middle, use reinforced concrete wedges or saws to reinforce.

Article summary: The above is all about what is the main cause of wall cracking and the whole content of the wall crack treatment plan, I hope it will help everyone. If you want to know more about it, please stay tuned to Qeeka Home.

The main causes of wall cracking: cracks caused by foundations, cracks caused by temperature changes, and cracks caused by materials.

1. Cracks caused by foundation reasons

The uneven settlement of the foundation of the house will lead to cracks in the wall, all the loads of the house are in the foundation, due to the diffusion of stress, the foundation of the house will appear uneven settlement, when the temperature of the upper layer of the foundation soil is below zero, the upper part begins to freeze, so that ice crystals appear, the volume expands, resulting in the upward uplift of the soil, causing the cracking of the wall, and this crack needs to be repaired by professional building structure personnel.

2. Cracks caused by temperature changes

All objects are affected by thermal expansion and contraction, and walls are no exception, because temperature changes can cause uneven shrinkage of wall bricks, which can lead to cracks in the wall, and we can repair the cracks caused by this temperature change with cement mortar.

3. Cracks caused by materials

We have a variety of wall blocks, among which there are common cracks and water seepage phenomenon in the cement block wall, when the dry shrinkage rate of the block is large, the wall is prone to cracks, for this kind of cracks, we need to clean the gaps, and then re-plaster.

Cracked parts of the wall are common

The first part is the part where the wall of the masonry is connected to the original wall.

For example, we have a partial renovation of our home and a new wall is built, and then this wall needs to be connected to the original wall. This stubble is the most prone to cracking.

The second part is that the construction hole left in the construction process is prone to cracking.

In this case, if we find that a wall in our home is cracked, and the initial appearance is a rectangular or square hole, then this hole is a later repair type to take the construction hole. Due to the lack of treatment of the construction hole, it is also very easy to crack, and this kind of crack generally appears through the joint.

The third part is that the top of the wall is prone to cracking.

The location of the crack at the top of the wall is generally 200mm from the bottom of the roof, which is the most prone to cracks. Because according to the requirements of the code, the top of the wall should be made of secondary masonry, and the number of sensitive and oblique masonry should be adopted. If the top practice is not standardized, such as a masonry in place or no diagonal masonry, the chance of cracking in these areas is very high.

1.Uneven settlement of the foundation of the house can lead to cracks in the wall;

2.The wall is affected by temperature changes, thermal expansion and cold contraction, and the pull-up wall cracks;

3.There is a common phenomenon of crack water seepage in the cement block wall, and if the drying shrinkage rate of the block is large, it is easy to lead to wall cracking;

4.Poor construction quality and cutting corners during construction can also lead to cracking in the wall.

SC3 crack monitoring and early warning instrument is specially developed for wall cracks and surface cracks, with low power consumption design and built-in battery that can work independently for a long time. The measuring range is large, and the early warning value can be set freely.

If the quality of the decoration is not up to standard, or the life of the house is too long, then the cracks in the wall will become a problem that troubles people. However, there are many causes of wall cracks, and the following will be summarized into 5 categories, and the various causes and treatment methods that cause wall cracks will be introduced in detail, and let's take a look at them together.

Cracks in the wall structure.

Cracks in the structural layers of the façade itself can also lead to cracks in the façade. There are two situations: one is that the original wall itself has cracks, which have not been properly dealt with in the later decoration; Second, there were no cracks in the original wall during decoration, but in the later stage, due to uneven foundation settlement and large temperature changes, it will also cause cracks in the wall.

Suggestion: This kind of crack can not be repaired by the general repair method, and it is necessary to ask professional construction personnel to deal with it according to the specific situation.

Cracks in the seams. The bottom cracks of the joints of the filial piety body of the wall shed will cause cracks on the surface of the wall. The cracks at the joints mainly appear at the joints of the reinforced concrete shear wall and the ceramsite bricks, the joints between the reinforced concrete beams and the ceramsite bricks, the doorways of the rear blocking, and the joints between the gypsum board partition wall and the original wall.

The cracks at the joints are mainly due to the action of the surrounding environment or external forces, and gypsum boards, prefabricated partition boards and prefabricated boards will be shortened and changed in orientation, resulting in cracks at the joints, generally longitudinal or transverse joints.

Recommendation: Repair should be carried out after the deformation of the entire building has stabilized.

Cracks in the putty layer.

Putty on the wall can make the wall smoother and smoother, much better than the cement wall, which can improve the effect of the paint and at the same time save paint. If there are cracks in the putty layer, cracks will also appear on the surface. Therefore, care should be taken during construction to avoid cracking the putty layer.

Suggestion: If the crack has penetrated deep into the putty layer, use a sharp tool to expand the gap to the size of the cone, then fill the caulking plaster, and polish it flat, paste the mesh cloth or kraft paper, then use putty to smooth it, and finally paint or paste the wallpaper according to the usual procedure.

cracks in the plastering layer.

There are two types of cracks in the plastering layer of the wall: normal cracks and abnormal cracks, and the general cracks refer to the cracks in the plastering layer caused by the shortening of the cement mortar; Abnormal cracking is caused by improper materials and construction methods. It is difficult to prevent ordinary cracks, but abnormal cracks can be prevented.

Suggestion: If there is a large area of hollowing in the stucco layer, the original ash layer should be removed and then painted. However, after such processing, the cost will increase relatively.

If there are only a few cracks, and there is no sand turning, hollowing, or falling off, the entire wall can be covered with a good cloth and then painted according to the usual procedure.

The paint film is broken. Cracks in the wall paint layer are caused by unqualified paint products and improper operation during construction.

Suggestion: If only the surface paint film is cracked, you can use fine sandpaper to wipe off the cracks, and then choose the same color wall paint and apply it again.

The main causes of wall cracking are as follows:1Building Material Issues:

The use of poor quality building materials or the use of unsuitable building materials, such as cement, bricks, etc., can easily lead to cracking of the wall. 2.Architectural Design Issues:

Unreasonable building design, such as insufficient wall thickness and uneven wall load-bearing, can also easily lead to wall cracking. 3.Soil Issues:

Problems such as soil settlement, expansion, and contraction can also lead to cracking of the wall. 4.External force action:

The action of external forces is also one of the reasons for the cracking and dispersion of the wall, such as **, wind, temperature changes, etc. 5.Construction quality and quantity problems:

Poor construction quality, such as uneven wall masonry, hollow inside the wall, etc., will also lead to cracking of the wall. 6.Improper maintenance:

Long-term non-maintenance, such as water leakage, dampness, etc., can also lead to cracking of the wall.

The load-bearing wall is damaged, the paint is uneven, the erosion is long-lasting, the temperature and humidity change, and the ground is cracked.

The main causes of wall cracking:

1. The original wall problem.

There are two main types of original wall problems. The first is the cracks or hollowing of the plastering layer and putty layer, which is mostly caused by the poor quality of raw materials, the wrong ratio and the shoddy construction of the developer during the construction. Therefore, when receiving the house, the owner must repeatedly check the quality of the wall, and once the problem is found, even if the house is not replaced, it is good to carry out targeted treatment during decoration.

Another situation is caused by the settlement of the house, which is caused by the uneven foundation, and the wall is prone to 45° cracks on the surface.

2. The construction is not standardized.

Non-standard construction, such as improper cement ratio, excessive thickness of plastering layer or putty layer, non-standard treatment of wall joints, etc., will lead to cracking of the wall.

3. The quality of construction materials is not up to standard.

If inferior materials are used, such as putty powder is of unqualified quality and cement mortar is expired, the wall is also easy to crack in the later stage.

4. The influence of temperature and humidity.

In addition to the effects of construction, temperature and humidity can also affect whether the wall surface is cracked. If the temperature is too low, it will affect the latex paint film-forming wall, and it is easy to crack.

5. Material ratio.

When building the wall, the ratio of cement is incorrect, the ratio is high and the moisture is large, the cement block will expand if the moisture is too high in use, and the moisture will shrink if the moisture is low, and its main manifestation is that the wall produces cracks, which is also a common problem when the cement block is built on the wall.