What causes cracks in the wall

Not long after the renovation of the home, the walls cracked, which was really depressing. There are many reasons for wall cracking, and understanding the cause can prevent and solve the cracking problem!

What are the specific causes of wall cracking? There are several situations that will cause wall cracking, the first situation is the strong cracking of the wall structure, resulting in strong cracking of the structure, the main reason is the cracking caused by the uneven subsidence of the foundation.

The second situation is the cracking caused by the joint between the new wall and the old wall. So what is the cause of this cracking? The main reason is that the shrinkage ratio of the new wall and the old wall is different, resulting in cracking.

These three situations are the cracking of the putty base, so there are several reasons for the cracking of this situation, the first reason is the cracking caused by the failure to deal with the base layer. The second situation is that the proportion of raw materials when we paint is not right, resulting in cracking. Generally, wall cracks are caused by several reasons.

How to repair the cracks in the wall?

First of all, the structural cracking, the cracking of the structural wall needs to be about a year or so, and then re-repaired, the repair method is to shovel the cracked place, and then use caulking gypsum. Then re-apply the kraft paper and re-apply the cloth, so that there will be no cracking in the later stage.

The second is the cracking of the junction between the new wall and the old wall, which requires us to embed this gap in the construction process to paste kraft paper, and then hang the net so that it will avoid cracking in the later stage.

Like the third case, we need to shovel the cracked place in the process of repairing, and then re-caulk after shoveling, and then hang putty to paint after caulking!

The above is the solution to wall cracking and prevention, I hope to give some help to the owners of the decoration!

Generally, the newly purchased house will be inspected in all aspects when it is delivered, and the delivery can be confirmed only after confirming that there is no problem, and the wall must be no problem, and there can be a lot of cracks in the wall of the newly renovated house. There are several reasons for this!

1. The paint layer is cracked.

If the temperature of the wall is too low and too high, it will make the wall work bad, and there will be cracking of the wall paint film, and if the quality of the wall paint is problematic or the construction is improper, it will also cause cracks, but this situation is relatively rare, and you can use fine sandpaper to polish the cracks until smooth. Flatten, and then repaint with the same color wall paint.

2. Cracking of the putty layer.

If there are cracks in the putty layer of wall construction, it will also make the wall paint cracks, so as to give people a visual sense of cracks on the wall, and the cracks that go deep into the putty layer can choose some tools such as files to expand the cracks, so that they can better fill in some plaster with caulking, and then polish and level with sandpaper after filling, and then brush the wall paint.

3. The plastering layer is cracked.

The wall itself is fine, and the cracks on the decorated wall may be caused by the cracks in the wall and plastering layer, which is due to the shrinkage of the cement mortar in the drying process after painting, resulting in cracks in the plastering layer, and may also be caused by the improper use of materials or improper construction technology in the plastering layer.

The above is the introduction of what causes the cracks in the wall of the decorated house, there are no cracks before the general decoration, and most of the cracks are caused by decoration construction, of course, there are some uneven foundation settlement caused by the cracking of the wall itself, I hope the above content can give you some reference.

1. Original wall problems: The quality of the original wall is a major cause of wall paint cracking after decoration, and there are two common problems of the original wall: one is the cracks and hollowing of the plastering layer; The second is the hollowing of the putty layer.

The cracks or hollowing of the plastering layer and putty layer are mostly due to the developer's poor quality of raw materials, wrong proportioning, and careless construction not in accordance with the specifications during construction. Therefore, consumers must carefully check the quality of the wall when receiving the house, and once the problem is found, it must be dealt with in a targeted manner when decorating.

2. Housing structure problems: Sometimes, the original walls of many houses are not problematic, or they have been treated accordingly before painting, but after decoration, cracks will gradually occur over time, why is this? In fact, the reason lies in the almost inevitable settlement of houses.

There are two kinds of housing structure problems, one is the settlement of the house, and the other is the deformation and settlement of the gypsum ceiling.

1) Shrinkage cracks: caused by the shrinkage of dry and wet changes of materials, generally in the form of a network on the wall, and two different materials may be formed on its interface;

2) Temperature cracks: caused by thermal expansion and cold contraction deformation, generally in the top floor of the house (flat roof) along the horizontal crack of the ring beam, along the vertical crack of the window corner, along the corner of the window or the diagonal oblique crack of the inner longitudinal wall (there are many at both ends, large, basically no in the middle); There is also an interface along the chimney of the attached wall;

3) Settlement cracks: oblique cracks in the shape of the wall caused by the uneven (differential) settlement of the foundation; the upper horizontal crack caused by the pulverization and compression of the mortar in the mortar joint; Vertical cracking of reinforced concrete beams caused by support settlement, etc.;

4) Deformation cracks: cross-cracks on the wall caused by deformation; vertical and horizontal walls are connected with vertical cracks; Fractures caused by inclination, etc.;

5) Structural cracks: also called load cracks caused by load, such as multiple vertical cracks of wall columns under girders; transverse horizontal cracks, oblique cracks, and vertical cracks in the middle of the span at the main reinforcement of the beam and slab; shear oblique crack at the side of the support; Transverse cracking of tension members, etc

Above the cracks, genus.

2) and a small amount.

3) Three types of cracks are not dangerous, (3)

5) The three are dangerous cracks, but they are not absolute, and need to be identified and analyzed on site.

There are many reasons for wall cracks, if there are cracks in the wall when the new house is just delivered, then it is likely that the wall is too thin or the wall cement is not yet dry and painted, generally need to remove the cement and repaint, in addition, if the wall cracks caused by the internal structure of the wall, it is best to ask professionals to repair and deal with it.

Causes of cracks in the wall.

After living in the house for a long time, there will be wall cracks and losses, which not only affects the overall aesthetic effect of the house very much, but also many people do not know how to deal with it, in fact, the first thing to do at this time is to carefully observe the wall and find the cause of the wall cracks.

If it is found that there are cracks on the wall when the new house is just handed over, the more common reason is that the wall is too thin or the cement paint is applied when the cement of the wall is not completely dry.

In addition, the cracks in the wall may also be a problem with the internal structure of the wall, such cracks are generally deeper, and it is more difficult to deal with.

Cracks in the wall are caused by temperature changes, cracks caused by foundations, cracks caused by construction, cracks caused by materials, and cracks caused by design.

1. Cracks caused by temperature changes

Thermal expansion and contraction are the basic physical properties of the vast majority of objects. Masonry is no exception. Due to the uniform temperature change, the masonry produces uneven contraction, or the expansion and contraction of the masonry is unevenly constrained, and the temperature stress exceeds the strength of the masonry and causes the masonry to crack.

2. Cracks caused by foundation reasons

The cracks caused by the uneven settlement of the foundation, the whole load of the house is finally transmitted to the foundation through the foundation, due to the diffusion of stress, the foundation of the house produces uneven settlement, when the temperature of the upper layer of the foundation soil drops to below 0, the upper part begins to freeze, and the lower part of the water continues to rise due to the capillary action to form ice crystals in the frozen layer, and the volume expands, so that the soil body is uplifted upward.

3. Cracks caused by construction reasons

Poor construction quality is another important aspect that leads to wall cracks. During construction, the low level of masonry workers, low quality awareness, and the contractor's intention to cut corners can lead to cracks in the wall.

4. Cracks caused by materials

Due to the introduction of national measures to protect cultivated land, the use of clay solid bricks and clay hollow bricks has been generally banned and restricted, and various blocks have been widely used. However, there is a common phenomenon of crack water seepage in cement block walls. The wet expansion and dry contraction of the block is especially obvious in the exterior wall, and when the dry shrinkage rate of the block is large, the wall is prone to cracks.

5. Cracks caused by design reasons

The main performance is that the foundation design is unreasonable or the drilling is not in place, resulting in uneven settlement and cracks, and the roof is not designed with an insulation layer due to the consideration of financial problems, resulting in a temperature difference between the roof structure layer and the wall, resulting in a temperature strain difference and fission.

Causes of cracks in the wall.

1. Improper treatment of the base layer: If the base layer is not thoroughly dried, it will lead to excess moisture between the base layer and the wall, which will make the wall skin expand and cause the wall to crack. If the jointing material is not thoroughly dried, the putty is scraped, and it is easy to cause the interior wall to be tired.

2. Improper construction: If the construction is too thick, resulting in a relatively dry interior, the surface drying will accelerate and become faster, and it is easy to cause cracking of the wall.

3. Improper scraping putty: the bottom layer of scraping putty has not dried thoroughly, just over the surface, although the surface is dry, but the inside is not completely dry, so that the degree of dryness between the inner and outer layers is not the same, and it will also lead to cracking at this time.

4. Poor soil quality: the foundation soil quality is not good, the bearing capacity is not enough, and the whole building produces wall cracks.

Wall crack repair method.

1. Use a putty knife to scrape out the width of the gap, and scrape it into a figure-eight shape, with the outer width and the inner narrow.

2. Use gypsum block dry powder to plug the void, and the filling depth is not less than 30-40mm, which does not need to be filled with the wall, which is lower than the wall.

3. Brush 108 glue in the gap and paste the glass cloth or cowhide note.

4. Scrape 821 putty 2-3 times and smooth it with the original wall, and polish it with sandpaper after drying.

5. Adjust the wall paint, brush the sample first after the paint is adjusted, compare it with the wall color after drying, the color is close, the color difference is not large, and then paint the wall.

There are several scenarios:1. The main reason for wall cracking is caused by uneven settlement of foundation, temperature change, material reasons and construction reasons.

2. The cracks caused by the uneven settlement of the foundation are more common in life, because all the loads of the 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.

3. No matter which process begins, the user should develop the habit of checking first, and what is introduced here is not only the cement wall, but also the need for a detailed inspection of the wall. To see whether the cement is solid and smooth, whether the plastering layer is strong or there are gaps and cavities, when checking the wall, it is also necessary to use the horizontal line to test whether the wall is horizontal, if there is a problem, it is recommended to find the developer or property to reflect, and ask it to redo the rectification.

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Some people will have cracks in the walls of their homes, so this onecracks in the wallAfter the situation appeared, everyone was very anxious, in a bad mood, and looked everywhere to solve the wall cracks, but to no avail, so what is the cause of the wall cracks? Do friends know? And after the appearance of this wall crack, our first task is to repair the wall crack, and this wall crack repair method is below the article.

First, the cause of wall cracks.

1. There are cracks in the insulation layer of the original house, which leads to cracking of the wall after decoration.

2. It is the improper repair and painting of the wall after slotting, which leads to the shrinkage of the wall and cracks.

3. The ratio of cement is inaccurate when plastering, and it is easy to crack if the ratio is high.

4. The situation is that the ratio of wall putty is improper or uneven scraping.

5. The ratio of latex paint and water is not suitable, and the above non-standard operations will lead to cracking of the wall.

6. The main reasons for the cracks in the concrete wall are the rotten causes of the concrete itself and the reasons in the construction process, and such cracks can be repaired by automatic low-pressure grouting. Automatic low-pressure grouting technology is a comprehensive technology developed by Beijing Metallurgical Engineering Crack Treatment Center for the field of concrete crack grouting including materials, machinery and tools. After grouting repair, the inside of the crack is filled with AB-1 grouting resin, and its tensile strength and adhesive strength are high, and no re-cracking will occur.

7. Cracks in brick masonry walls, cracks in new partition panels and cracks in walls of different materials belong to temperature live joints, which cannot be repaired by grouting due to the expansion and contraction of cracks, so flexible materials should be selected for repair (such as A12 high flexible joint patching material of Beijing Metallurgical Engineering Crack Treatment Center) This open repair method is a new burning concept, compared with the previous rigid repair, it is more suitable for crack treatment with a large amount of activity.

Second, the wall crack repair method.

1. Treatment of cracks in insulation boards. Use a putty knife to cut the crack as deep as possible and fill it with plaster. Pay attention to be sure to fill it up and fill it evenly.

Then use a bandage, bean cloth or white cloth to paste the cracked area, dry it, and then scrape putty or do other processes. If the crack is severe, you can also use kraft paper or newspaper to repair the joint, the effect may be better.

2. The reason for the cracks after the trunking is that the drying speed and shrinkage rate of the cement mortar are different from the putty powder, and the putty on the surface of the wall has been dried, and the cement mortar inside has not dried thoroughly, so cracks appear. Therefore, the effect of gypsum powder for the wire repair duct is better.

3. If the wall putty is scraped too thick at one time, or the thickness of the entire wall is too different, cracks will also occur. In severe cases, it will also fall off. If necessary, you should scrape several times, each time thinner and longer.

However, it should be noted that the putty is scraped more times and is easy to fall off.

If there is such a crack in the wall mold in our home in the future, you can follow the wall crack repair method in the above content of our article to learn, and the actual reference is the reason for our wall cracks, I hope friends will try to avoid it in the future.