Why does putty powder crack when used on exterior walls?

It must be a problem of anti-cracking mortar, putty is not anti-cracking, this is a result of the formation of the pursuit of low cost, the later cracking will be more serious, when the time comes to meet the wind, it is possible that the whole wall will fall off, and the whole wall has fallen off.

1) The uneven settlement of the building matrix structure leads to cracking of the wall (less commonly).

2) The ratio of plastering layer materials is improper, the particle size of the aggregate in the mortar is too fine, the proportion of glue structure material is too large, and the mortar shrinks too much and cracks appear.

3) During construction, the outside temperature is too high, the water is easy to evaporate, the water absorption of the base layer is too fast, the water loss of the mortar layer is too fast, and the hydration reaction of the cement is incomplete, which causes uneven shrinkage and produces a large number of fine and short irregular cracks.

4) The maintenance of the plastering layer is not paid attention to, due to temperature changes, temperature cracks due to thermal expansion and contraction, especially when freezing, cracks occur due to the expansion of water freezing volume. Humidity changes, due to the expansion and contraction of moisture, resulting in shrinkage cracks.

5) The use of materials during the construction of the putty layer is improper, the construction method is not standardized, and the putty layer is too thick, resulting in its own defects, resulting in poor surface crack resistance.

6) The topcoat is applied before the primer dries, causing shrinkage cracks. The application temperature is too low, and the paint fails to form a film and causes cracks.

It is better to use special exterior putty.

The biggest possibility is that the quality of anti-crack mortar and anti-crack putty powder is not up to standard. It is said that it is flexible, too much fraud, because in the outer wall from the inside to the outside, the flexibility of the product is also required to be better and better from the inside to the outside, and the outer layer must be satisfied

The cracking of putty powder wall is manifested in the phenomenon of dry cracking on the surface after a period of time, which is generally caused by the following four situations.

1. The construction requires the moisture content of the base layer to be 10%, which may cause cracking due to the construction before the base is completely dried.

2. The bottom layer of putty is not completely dried, the surface layer is dried first, and the inner layer is still in the process of drying, resulting in different degrees of drying and shrinkage between layers, and it is easy to crack.

3. When the base layer is treated, the joints and leveling materials are not completely dried, and the interior wall putty with strong hardness is applied on it, which is easy to cause cracking.

4. The construction is too thick, the internal drying is slow, and the surface drying speed is faster, which is also easy to cause cracking.

The cracking of putty powder is generally caused by large thickness and curing contraction. Scrape in two parts, the first layer is cured and then the second layer is scraped.

The reason why putty powder is listed is mainly due to the relatively large thickness of putty powder, and then the cracking caused by factors such as a relatively dry climate.

1. The construction of the base layer is not completely dry, and the moisture content of the base layer is required to be 10%.

2. The bottom layer of putty is not completely dried, and the surface layer is dried first, while the inner layer is still in the process of drying, resulting in different degrees of drying and shrinkage between layers, and it is easy to crack.

3. When the base layer is treated, the joints and leveling materials are not completely dried, and the interior wall putty with strong hardness is applied on it, which is easy to cause cracking.

4. If the construction is too thick, the internal drying will be slower, the surface will dry faster, and the cracking speed will be faster.

The cracking of putty on the whitewashed sand-gray wall is mostly caused by the hollowing of the interior wall, and there are two kinds of putty cracking on the top gypsum board, one is the thickness of the putty and the ventilation is too thorough, and it will crack quickly. Another type of ceiling plate is deformed and loose, which can also cause cracking.

This may be caused by the shrinkage of the putty, the first putty is not dried in the first time to scrape the next putty, the second putty is not dry and painted, resulting in the cracking of the back layer of the putty dry shrinkage.

If the ratio of putty to water is not mixed well, or the surrounding air is too dry, it will cause it to crack, so be sure to mix it according to the ratio on the manual.

The cracking is because they are not added to the bit, so they are prone to some dry cracking.

In general, it is a sand problem.

Either the quality is not good, or the use is inappropriate.

1. Wall paint can be applied. This method is suitable for cracking small areas of putty powder walls. 2. Scrape the plaster.

For walls with small cracks, the cracked parts should be shoveled off and then cleaned, and then the plaster should be scraped with a putty knife, and the plaster should be dried thoroughly before applying latex paint. 3. Scrape putty. Before starting, you need to shovel the cracks and bulges and around them, then fill the gaps with putty and allow them to dry before applying wall paint.

4. Professional handling. This method is suitable for large cracks in the wall and requires professionals to use special tools to deal with them. Reasons for this:

1. The thickness of the wall putty is too thick, and when the putty is too thick, it is easy to cause the wall to dry and shrink inconsistently, resulting in cracking. 2. The thickness of the wall putty is too thin, and the putty that is too thin will make the moisture volatilize quickly, which will cause cracks on the wall to dry. 3. It may be that the surface of the base layer of the wall is not solid enough, and there are attachments such as floating dust.

Whether there is enough dust on the surface of the foundation is one of the important reasons for putty cracking, and we should pay more attention to it. If the old wall putty is not solid enough, it may be that the surface dust and other attachments have not been cleaned. 4. The bottom surface of the wall is too smooth, and the wall surface that is too smooth will reduce the adhesion of the putty, and cracks may occur when drying.

Hello dear, happy to answer your <>

The cracking of putty powder after scraping the interior wall is a plastering quality problem, which is generally due to the improper ratio of cement plastering mortar. If there are small cracks in the indoor wall, you need to see whether the wall is a load-bearing wall or a partition wall, and the location is the door and window opening, 1. The previous putty was hung up the next time before it was dry, and the dry and wet changes formed cracks, 2. The temperature cracks caused by temperature changes and thermal expansion and contraction; 3. The base layer is not well treated or the wall structure is deformed and the structural cracks are caused by static and dynamic loads. 4. Poor product quality will cause cracks, mostly due to the wrong material ratio.

5. The putty layer is too thick. 6. Many factors such as asympathy of maintenance methods may cause putty cracking. If it is a lightweight partition wall, generally use nylon mesh cloth or kraft paper, and the partition board itself is also prone to small cracks, so in order to minimize cracking in home decoration, it is best to paste a glass silk cloth or bean bag cloth.

If it is a load-bearing wall or a solid wall, the reason for the cracking may be that the putty is too thick during construction or the interval is short, and the putty is not dry. For the old wall, the original base putty and paint should be removed as required, and the original wall decoration of some rooms uses 821 putty, which is easy to powder, peel and fall off, so it should be shoveled off, re-processed and brushed. In the construction of the wall, we should pay attention to such problems, first of all, the ratio of cement and sand, the best ratio is 1 to 3, improper ratio will affect the toughness and tension of the wall; Then there is to find the ratio of putty and latex paint, when painting latex paint, problems will occur if you add too much water.

The circuit transformation should be carried out with the carpentry foundation, because after slotting to leave time for repair, the drying speed and shrinkage rate of cement mortar are different from putty powder, and there will be shrinkage and sag after the first repair, and the second repair should be carried out when the wall construction is done, so as to level the wall and avoid cracking. When there are cracks and other problems in the colored wall paint, the effect of local repair is often not good, because the color wall paint will be obvious color difference when it is repainted. If there is a crack in the insulation board, use a putty knife to cut the crack, as deep as possible, fill in the gypsum, pay attention to be sure to fill it, fill it evenly, and then use a bandage and nylon mesh cloth to paste the cracked place, and then scrape the putty or do other processes after drying.

Wall putty cracks are a common problem and are usually caused by factors such as the aging of the building, poor material quality, exposure to extreme climatic conditions, high humidity, or the base material is not hard. If this problem is not dealt with in time, it will lead to the crack becoming bigger and bigger, and even have a negative impact on the structure of the building. To avoid this from happening, here are some ways to fix wall putty powder cracks.

1.Clean the walls.

First of all, the wall needs to be thoroughly cleaned to remove any impurities and broken putty powder to ensure that the new putty material can fully adhere to the wall. Stains and dirt can be removed from the wall with a brush or rag and rinsed with water.

2.Fill the cracks.

Filling the crack is a necessary step and can be filled with a moving lead limb putty sheet or homemade putty. If the crack is relatively large, it is recommended to use a mobile putty sheet. Since they can be moved and positioned like regular planks, it ensures that the pressure that fills around the crack is uniform.

3.Level the walls.

After filling the cracks, the wall needs to be leveled, and tools such as spatulas or planks can be used. If necessary, sandpaper or a grinder can be used to sand the surface to make the wall smooth and blemish-free.

4.Repaint.

After the most vertical source, the wall needs to be repainted to cover the filling and leveling putty material. It is recommended to use materials such as monochrome paint or wallpaper.

In short, wall putty powder cracks not only affect the appearance, but can also cause serious consequences. Therefore, it is imperative to take timely steps to fix this issue. All these methods require simple tools and skills to restore the beauty of the wall while protecting the structural integrity of the building.

Hello, the reason why the putty powder and wall paint mixed scraping the wall will crack is as follows: it may be due to the second pass of the putty on the ground layer before it is dry, the surface layer is dried first, but the inner layer is not completely dry, so the degree of drying and shrinkage between the layers is different, which leads to cracking. Thank you for your consultation, I hope I can help you, I wish you a happy life and a smooth work.