How to prevent wall cracking, how to prevent wall cracking

To prevent wall cracking, putty, the base material of the wall that is overlooked by many people, plays a key role. A 100-square-meter house needs more than 600 kilograms of putty, and it occupies an area of more than 200 square meters. Such a large amount of use, such a wide area of use, his *** bad, environmental protection or not is the most noteworthy home decoration.

There is an insider's saying in the coating industry: "Three points of paint, seven points of putty." This means that the role of the surface material only accounts for 30% of the mass, while the role of the base material accounts for 70%.

Generally speaking, the role of the base material is mainly firm, flat and smooth. It is the foundation of the entire wall decoration. On this basis, the role of the surface material is mainly "coloring", that is, giving color to the surface and playing a beautifying and decorative role.

The traditional glue putty only sticks the lime powder to the wall with glue, and the lime powder as a filler does not have any cohesiveness, and the glue will volatilize with the growth of use time, resulting in poor adhesion performance for a long time, and the result is that the wall is cracked. Saint-Gobain aldehyde net putty series uses natural gypsum as the main material, plus imported environmental protection additives, only need to add water and stir to use. Gypsum is stirred with water, and soon it becomes gypsum dihydrate from semi-hydrated gypsum, and the gypsum crystals of dihydrate are closely combined with each other, so that the hardened gypsum becomes artificial stone with high strength.

Its adhesion is 1000 times the bonding strength of glue, which ensures that the putty layer is firm and does not crack.

On the other hand, glue contains a large amount of formaldehyde, benzene and other harmful substances to the human body, and long-term exposure to it will seriously affect the health and safety of the human body, especially the elderly, children and pregnant women. Saint-Gobain aldehyde net putty series is made of natural gypsum, and no toxic and harmful substances are added during the production and processing, so there is no adverse effect on the human body and protects the health and safety of users.

A better way is to hang steel wire mesh sheets at the base layer, and then powder cement mortar.

The relatively simple method used by the decoration company is to paste kraft paper on the cement mortar layer, but the effect is poor.

If your wall latex paint has been done and cracks, you can repair the latex paint first.

If it still cracks, it is likely that there is a hollowing inside, and if it is serious, it is necessary to shovel off the cement mortar layer and redo it.

1. If the base of the wall is not good, and there is a hollow drum peeling, it is recommended to remove the wall to the sand and ash layer;

2. Brush glue or directly paint plaster cover glass fiber mesh cloth leveling;

3. Scrape 2-3 putty leveling;

4. Brush the primer twice and the topcoat once;

5. Keep the indoor constant temperature, don't open and close the windows for a while, and don't let the wind blow on the walls.

The base layer should be done on the gypsum board partition wall and the kraft paper bag should be pasted there to prevent cracking.

If you want to choose a good paint, this is also the case in my family.

Before scraping putty powder, be sure to check whether there are cracks on the wall, whether there is water leakage on the wall, and whether there are hollow drums on the wall. In order to prevent wall cracking in the future to a large extent, whether it is a new house or an old house, the original wall surface should be completely eradicated. If the building materials used in the original base of the new house are of poor quality or shoddy products, it will cause the subsequent coating to be poorly bonded to the base layer, resulting in wall cracks.

Cracks are easily generated at the joints of different base layers, and special treatment is required during the construction process. For example, if the joints between the wooden frame of the wall cabinet and the wall are not treated, there is a high possibility of cracks after the four seasons. During the construction process, the method of inlaid wood is usually used to cover up the cracks that may occur.

Wall blistering, cracking, and peeling are often the most reflected problems in decoration. With high-quality paint, the wall can be used normally for 5 to 8 years. It is not normal for the wall to blister, crack and peel in a short period of time.

The main reasons for the blistering of the wall are: adding too much pigment or mixing with sundries in the paint mixture; Paint buckets, brushes, rollers or spray guns are not clean; Before the paint surface is completely dry, moisture penetrates and the paint film loses its adhesion; The wall was not cleaned before painting. In order to avoid blistering on the wall, it should not be painted in seasons or weather with high humidity.

When painting, it is necessary to wait for the putty or the first coat of paint to dry before applying the next layer. The main reason for the peeling of the wall is the non-standard operation of the construction workers, and it may also be caused by the poor adhesion or shrinkage performance of putty and paint. To avoid peeling on the wall, first choose a high-quality water-resistant putty.

Before applying latex paint, you need to scrape the putty at least two or three times and use glue to increase the stickiness.

When it comes to painting a wall, priming is the most critical step. After the wall is leveled, the interface agent is applied, which has the effect of moisture-proof and can also play a role in protecting the latex paint. The next step is to scrape putty, whether it is putty paste or putty powder, it must be moderately blended.

Putty is generally scraped two or three times, then brushed with glue, and finally brushed with latex paint.

1. Select high-quality water-resistant putty with high whiteness, good water resistance and high bonding strength;

3. The thickness of each putty should not exceed 2 mm.

4. An appropriate amount of 108 glue can be added to the putty to increase its adhesion;

5. Before the construction of latex paint, the construction environment should be thoroughly cleaned and the wall should be cleaned;

6. Avoid painting in the season with high humidity or in rainy weather;

7. When reworking and repairing, the cracks should be scraped clean first, and then scraped with putty, and then painted with topcoat after the putty dried.

1.Grassroots treatment. The old house is subject to external impact and vibration in long-term use, which may cause the local wall base to be separated from the wall.

If the original old wall skin is not removed or only the surface putty is removed when the wall is renovated for the second time, the uneven part of the wall skin will be left. Subsequent brushing with interface agent or putty is likely to cause cracking of the newly painted wall. 2.

Interface thickness. When the old wall is treated, the interface agent is not painted, or the interface agent is too thin, and after the indoor humidity changes, the wall skin will be hollowed, and then cracks will occur and fall off. 3.

Putty thickness. If the putty layer is too thick, the wall will easily fall off in the future. The putty of the wall paint is generally batched 2 to 3 times, and the thickness of each putty is not more than 2 mm, and it can only be approved once when it is dry.

4.Dry processing. When treating the base layer of the wall, the putty process cannot be carried out when the air humidity is higher than 70.

If the moisture content is too large and has not been dried, the putty or wall paint is directly brushed, each layer of material is different, the drying speed is also different, once the temperature rises, the wall layer will crack due to the different degree of shrinkage. 5.Material ratio.

Improper proportioning will affect the toughness and tension of the wall. The ratio of cement and sand should be 1:3 when plastering the base layer, and it is easy to crack if the ratio is high; The ratio of wall putty, latex paint and water should be accurate, otherwise the cracking method will cause cracking of the wall paint.

If the cracking of the wall only occurs in a small area, it can be remedied as follows: 1Use a cutting machine to cut the crack into a "V" shape (30 degrees if the crack is small, 45 degrees if the crack is large), and blow off the floating ash in the incision.

2.Mix white latex, caulking gypsum powder and water thoroughly (the ratio of white latex to water is 3:1), fill the mixture into the "V" shaped incision, and fill it until it is filled.

3.After the filler is dried and solidified, it is pasted on the outside of the "V" shaped mouth with a good cloth and allowed to dry thoroughly. 4.

The batch of putty is leveled, dried and sanded with fine sandpaper, and finally brushed with latex paint. If the wall is cracked, the scope of falling off is too large, and the situation is serious, you should be determined to use the method of treating both the symptoms and the root causes. When redoring, pay attention to the wall skin must be removed, until the wall tiles are shoveled; Then follow the correct steps for the wall operation.

It should be noted that the wall should also be patched. It cannot be replaced with kraft paper, because kraft paper lacks toughness after drying, which is easy to drive the cracking of the wall skin.

How to avoid cracks.

1.Use high-quality materials.

Experts suggest that when selecting materials, we must purchase them through formal sales channels, select building materials products with qualified quality, and use them in strict accordance with product instructions.

2.Reasonable disposal of the original wall.

At present, the common practice of decoration companies in the market is: for the decoration of old houses, decoration companies will recommend that the owner completely eradicate the wall before carrying out follow-up construction; For the decoration of new houses, considering that the developer has done a good job of base treatment on the wall, if the owner has no special requirements, the decoration company generally adopts the method of local treatment, that is, only repairs the cracks in the existing base layer. Some people in the industry pointed out that in order to prevent wall cracking in the future to the greatest extent, it is best to completely eradicate the original wall regardless of whether it is a new house or an old house.

Because, if the building materials used in the original base of the new house are of poor quality or shoddy products, it will cause the subsequent coating to be poorly bonded to the base layer, resulting in wall cracks.

However, the total amount of construction to completely eradicate the wall is large, and the fee is higher, and many owners of new houses are generally reluctant to choose this construction method in order to reduce decoration expenses, thus increasing the possibility of cracks after the decoration of new houses.

3.Attention to detail.

Cracks are easily formed in the joints of different base layers, so special treatment is required during the construction process. For example, if the joints between the wooden frame of the wall cabinet and the wall are not treated, they are easy to crack after the change of seasons. During the construction process, the method of inlaid wood is generally used to cover up the cracks that may occur.

Improper repair of the wall after it has been grooved can also lead to cracks in the wall. Theoretically, the cement mortar used for repairing and slotting should be the same as the ratio of cement of the building wall, which is difficult to achieve in actual operation, therefore, the cement mortar of 1:3 ratio is generally used in the construction to backfill, and the slotting place is pasted with cloth or kraft paper to avoid the wall cracks caused by cement shrinkage.

Crack-prone parts of the wall:

1. The slotting of the water and electricity tank. Water and electricity are laid in the wall, which has become an important way to improve the aesthetics of decoration. However, the problem with this is that when the wall is cut and cut, it will cause cracks and cracks in the otherwise solid wall.

Solution: Generally, the tape king + anti-tear cloth is used to fill the cut groove to strengthen and repair the water and electricity groove.

2. The back wall of the bathroom. If the bathroom cracks and leaks, it will affect the decorative effect of the next wall, such as mold, falling off, shelling, etc., if the back wall is installed with a wardrobe, the wardrobe will be moldy, deformed, and even rotten to a large extent.

Solution: Use the combination of anti-crack king + anti-crack cloth to build anti-crack and waterproof in one step, effectively solving the phenomenon of cracking and leakage on the back wall of the bathroom.

3. The junction of the ceiling plate. Interior decoration often uses plates, at this time, there will be wide or narrow gaps at the junction of plates and plates, plates and walls, which are affected by the climate and environment, thermal expansion and contraction, and the gaps become larger, and the walls will appear along the joints with regular line-like cracks. In this case, crevice treatment is essential.

Solution: Use the joint king to do caulking and tape between different plates or at the junction of the plate and the wall, prevent cracking and fix the wall, and avoid cracking caused by the expansion and contraction of the plates.

4. The junction of the old and new walls. When decorating a new house, the room layout will generally be re-planned, so a new wall will be used as a partition, but the new and old walls will have different shrinkage rates, different dry and humidity or vibrations by external forces, and cracks will occur.

Solution: Scrape the anti-crack king at the junction of the old and new walls, paste the anti-crack cloth to avoid cracking.

5. Yin and yang angles. Yin and yang angles are the most susceptible to bumps and bumps in the decoration process and daily life, resulting in missing corners and cracks, and home decoration looks unsightly.

Solution: Use the corner king, with the use of the corner protection strip, the corner of the wall can be formed in one step, and the anti-collision ability of the corner can also be enhanced, so you don't have to worry about the daily small bumps.

There are many reasons for the cracking of the wall of the building, which is very complex and cannot be solved in the decoration, such as foundation problems, uneven settlement of buildings, **, these are large aspects, small aspects, material problems, construction quality problems, plastering quality problems, etc., specific problems should be specifically analyzed.

After snatching the original white, brush one side of the milky white glue, and the glue should not be too thick. Then hang the glass wire mesh, make the cement mortar or caulking gypsum scrape to paste the glass wire mesh, in the scraping of the white, you can ask the big white workers, they all know how to operate.

Hello, generally use steel wire mesh powder into the wall to prevent the wall from cracking, if the mud can not be constructed, you can be pasted by the painter when scraping putty glass cloth (or indeed good cloth) layer, and then scrape the inner wall putty outside. In addition, the construction materials can not be inferior materials to prevent the material from thermal expansion and contraction caused by small cracks.

Pour more water on the wall, but the wall is soaked during construction.

In newly renovated rooms, if there are cracks in the walls, it will affect the aesthetics. If we prevent it well during construction, most of the cracking phenomena can be prevented, how to avoid wall cracking, summarized as follows:

1) The joints between the decorative parts and the wall should be made of gypsum board, the paper edge of the gypsum board should be cut and removed, and the joints between the gypsum boards should be at an oblique angle of 45 °, and the gaps should be filled with gypsum powder, so that they can be dried and then pasted with a good cloth.

2) When the circuit is transformed, in order to avoid hollowing the surface structure of the wall caused by chiseling grooves, it is best to use a cutting machine to open the wire groove, and when laying PVC, a cement mortar with a strength grade of not less than M10 should be used for protection, and the thickness should not be less than 13mm.

3) If there is hollowing, cracking, etc. on the wall before construction, it should be removed, and after being wet, it should be dried with paper fine lime powder.

4) Choose high-quality interior wall putty. Premium putty is a cement-based dry powder material that provides a highly affinity, two-way adhesion to walls and paints, preventing paint from peeling and peeling. In addition, high-quality putty has a water-retaining component, which can slow down the evaporation of water to a certain extent, and still maintain the original flexibility when drying.

After hardening, the putty layer still has extremely strong tensile strength, which is enough to withstand the tensile force caused by cold shrinkage without cracking.