What are the causes of cracks inside and outside the walls of a dwelling in one location?

Figure-of-eight cracks appear at both ends of the longitudinal wall of the top floor, which can develop to within the length of the house 1 3 in severe cases, and sometimes can also occur on the transverse wall. The crack width is generally large in the middle and small at both ends. When there are windows at both ends of the outer longitudinal wall, the cracks are in the diagonal direction of the window.

2) Horizontal cracks appear in the ash joints of the 2-3 skin bricks under the eaves of the flat roof or the top layer of the ring beam, and are intermittently distributed along the top of the outer wall.

The end is more severe than the middle. At the corner, the horizontal cracks of the vertical and horizontal walls intersect to form corner cracks. For the general cracks in non-** areas, if they do not develop after a few years, they can be considered to not affect the safe use of the structure.

For the cracks that occur due to the insufficient strength of the wall raw materials, the wall can be coated with reinforced mesh, and equipped with through-wall reinforcement to be fixed, and then filled with fine stone concrete or layered cement mortar for reinforcement. The reinforcement method of wall cracks should be proposed by the design department.

One is the common problem of crack quality caused by uneven subsidence of the foundation;

Cracks in the wall are not a trivial matter, and they must be remedied by a professional decoration company.

How to hang the net when there are cracks in the wall, and where are the places that are prone to cracks, let's find out.

It indicates that the cracks in this part are internal and external penetrating cracks, which are generally structural cracks.

What are the main causes of cracks in the walls?

There are five reasons for the gaps in the wall

The first is that there are gaps in the insulation layer of the original house, causing the wall surface to crack after interior decoration;

The second kind is that the wall surface is unreasonable after the repair and brushing, and the wall surface is closed and cracks occur;

The third is that the ratio of concrete is not accurate when batching putty, and it is very easy to crack if the ratio is high;

The fourth condition is that the ratio of wall putty is unreasonable or uneven scraping;

The fifth is that the ratio of wall paint and water is not suitable, and this non-standard practical operation will cause the wall to crack. If it is a lightweight wallboard, generally use polyester alkali-resistant mesh cloth or wrapping paper, and the lightweight partition board itself is also very prone to small cracks, so in order to better avoid cracking in home decoration, it is best to paste a glass fiber cloth or bean paste wrapping cloth, if it is a load-bearing beam or solid wall, the reason for cracking may be that the putty is too thick during the construction of the project or the time interval is short, and the putty is not dry, and the old house is transformed into a ground leveling wall. For the old wall, it should be stipulated that the original bottom putty and architectural paint are cleaned and tidy, and some houses are originally used in the interior decoration of the wall with 821 putty, which is very easy to delamination

Peeling, falling off, to shovel off, carry out the bottom layer again, and then brush. In the construction of wall engineering, we should pay attention to such a number of problems, the first is the ratio of concrete and gravel, the best proportion is 1 to 3, the ratio is unreasonable will endanger the ductility and support of the wall; There is also the need to choose the ratio of putty and wall paint, when spraying latex paint, too much water will cause problems.

Hydropower renovation should be carried out gradually with the carpenter, because the time to be repaired after the groove, the drying rate and shrinkage rate of the mixed mortar are different from the putty powder, and the depression will occur after the first repair, and the second repair is also needed to carry out the second repair in the case of wall engineering construction, so that the ground can level the wall and prevent cracking. When there are gaps in the colorful wall paint, the actual effect of partial repair is usually not good, because the color of the wall paint will be significantly cast when it is repainted. If the thermal insulation board is cracked, use a putty knife to crack it, as deep as possible, fill in the plaster, pay attention to be sure to fill it, fill it evenly, and then use gauze and polyester alkali-resistant mesh cloth to paste the cracked area, and then scrape putty or do other processing technology to solve it after drying.

That's all for my detailed introduction, I hope it will be helpful to you after reading it.

It may be because the walls are in disrepair, or it may be because our walls are damp, so the cracks appear.

The wall has been exposed to wind and sun for a long time, the paint of the wall has not been learned well, the insulation layer of the wall has cracks, and the cement ratio is not accurate when applying the wall.

It is likely that the wall has been repaired for a long time, or the quality of the paint is not particularly good, it may be because the wall is shaking, it may be because it is unevenly applied, or it may be because the ratio is completely incorrect.

It may be due to the high temperature, or it may be due to the heavy rainfall, which causes the room to be very humid and cracks to appear on the walls.

There are many reasons for cracks in the walls of commercial houses, mainly including the following aspects:

1.The architectural design is not reasonable. It may be that the building quality problem or the structural design is improper, such as the imbalance of the building itself, the unreasonable structural design of the house leads to vibration, etc., the house will be slightly deformed, resulting in uneven stress on the wall, and eventually lead to cracks.

2.Improper selection of materials. The quality and performance of materials are also important reasons for the occurrence of cracks in the house, such as the insufficient quality of the steel bars used in the wall, the poor quality of the wall bricks, etc., which directly affect the structural stability of the wall, resulting in the lack of toughness of the wall and the cracks. Hashimi.

3.The quality of building construction is poor. The quality of building construction is mainly focused on wall masonry, such as unreasonable cement mortar preparation, non-standard construction, etc., which will lead to wall cracks.

4.Climatic and soil factors. It mostly occurs in typhoons, heavy rains, ** and other weather changes or areas or environments with large changes in soil humidity, and the wall is prone to cracking after bearing a certain pressure.

If the building is built on a river beach or in a low-lying area, the foundation will sink or shift, which will cause the instability of the building and lead to cracking of the wall.

5.Improper use management. Improper personal use during use, such as improper placement of heavy objects, excessive loading of objects and other improper operation of the balance will lead to cracking of the wall.

In short, there are many reasons for cracks in the wall, which are basically related to the quality of the building, so it is important to choose a reliable developer and builder when buying a commercial house. In addition, it is also very important to carry out regular maintenance and repair to solve minor problems in a timely manner.

Cracks in the wall are generally due to workers who do not apply them evenly. I think the best way to avoid this is to choose a good renovation team.

Generally, it is because the foundation is unstable, or the materials are sloppy, and some materials are not tight, resulting in the instability of the wall. It is recommended to find a master to repair it in time, don't take it seriously, and leave it to a professional person.

Cracks caused by temperature changes, cracks caused by foundation causes, cracks caused by uneven settlement of foundations. It can be used with grouting reinforcement method, adding ring beam method and so on.

The main causes of cracks in cement mortar plastering walls:

Cement mortar shrinkage is one of the most common factors causing wall cracks, which mainly includes chemical shrinkage, drying shrinkage, self-shrinkage, temperature shrinkage and plastic shrinkage. Each type of shrinkage has its own characteristics and behaves differently when it comes to causing cracking in plastered walls.

1. Chemical shrinkage, also known as hydration shrinkage. Cement hydration produces a heat of hydration that increases the solid phase volume, but decreases the absolute volume of the cement-water system. All cementitious materials have this reduction effect after hydration.

The volume reduction of most Portland cement slurries after complete hydration is 7%-9%, and before hardening, the solid phase volume increased by the hydration of the plastering mortar fills the space originally occupied by water, making the cement stone dense and the macroscopic volume reduced. The macroscopic volume of the hardened plastering mortar remains unchanged, while many capillary cracks are formed after the cement-water system is reduced, which affects the performance of the plastering mortar.

2. Drying shrinkage refers to the irreversible shrinkage that occurs when the plastering mortar loses the adsorption water of the internal capillary pores and gel pores in the unsaturated air after the curing stops;

3. Self-shrinkage refers to the reduction of the macroscopic volume of the plastering mortar due to the negative pressure generated by self-drying without external moisture supplementation. The self-contraction begins with initial coagulation and occurs mainly in the early stages;

4. The temperature shrinkage of the plastering mortar, also known as cold shrinkage, is the shrinkage of the plastering mortar when the cement hydration temperature rises and finally cools to the ambient temperature. The size of temperature shrinkage is related to the coefficient of thermal expansion, the maximum temperature inside the plastering mortar and the cooling rate.

5. The plastic shrinkage of the plastering mortar refers to the plastic drying contraction of the plastering mortar before hardening because the water evaporation rate on the surface is greater than the water leakage rate from top to bottom inside. The plastic shrinkage of the surface of the plastering mortar is affected by time, temperature, relative humidity and the water secretion characteristics of the plastering mortar.

Once the plastering mortar has a certain strength and cannot adapt to the plastic shrinkage through the plastic flow, the plastic shrinkage cracking will occur at this time, and the plastic shrinkage joints of the plastering mortar, whether visible or not, will affect the durability of the plastering mortar.

Due to these shrinkage of cement mortar, there is a contradiction between the short strength growth cycle (the main strength is completed in more than 10 hours) and the long volume shrinkage cycle (several months or even hundreds of days, the shrinkage rate is 8%-10%), which will cause tensile stress in the plastering wall, and cracks will appear when the tensile stress exceeds the tensile strength of the cement mortar.

Many people will transfer the problem to the paint when they mention the cracks on the wall, but in fact, this is very one-sided, and there are many reasons for the cracking of the wall paint, and what are the reasons!

Pristine wall issues.

First, the plastering layer cracks and hollows;

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.

Problems with latex paint.

The quality of latex paint is caused by non-standard treatment at the base level during construction, and improper use of materials will cause wall paint problems.

Construction issues. The climate selected during construction is improper, the wall is slotted and repaired improperly, and the ratio of latex paint is improper.

Gypsum ceiling deformation and settlement.

Another common cause of surface cracking is the settlement of decorative components such as suspended ceilings. One of the most common is the deformation and settlement of the ceiling of gypsum board. Gypsum board ceilings are generally constructed using two processes.

One is the use of wooden keel, due to the natural lack of stability of wood, generally poor treatment or construction is not in place will cause thermal expansion and contraction caused by surface deformation, the other is light steel keel, sometimes the decoration company in order to save materials, intentionally increase the keel spacing, resulting in gypsum board settlement in the future.

Life: What's the deal with cracks in the wall? What should I do if it appears? Check it out!