There are many cracks in the exterior wall painting, especially the gables. Is it putty or paint?

If it is a house built by your own family, it is recommended that you take a look at the settlement of your gable, if the settlement is too large, then what kind of putty is not good.

In addition, the putty that may be bought is fake, and the paint is brushed on the putty, and the putty does not crack, and the paint will not have problems.

I recommend using flexible putty + elastic coating, with flexible putty as low, if the putty deformation is small, so that the paint painted on the top is not easy to produce large deformation.

If it cracks again, it is recommended to choose wallpaper, which is beautiful, high-grade, easy to clean and not easy to crack.

I feel like you still have some experience in engineering.

Judging from what you reflected, it should be that there is a problem with the putty layer, and your elastic coating may not be very good.

1. When your putty is batched, cracks appear, indicating that your putty is too rigid and shrinkage (the proportion of cement is large, and the rubber powder is less), and due to the change of dry shrinkage of the cement itself, it leads to cracking, so it is recommended that you use real flexible putty, pay attention, don't be fake!

2. After the putty layer is fully cured, then brush the primer + elastic coating (for example, SKK, STO, PPG), a good elastic coating can cover 0-2mm cracks, and can be waterproof into your insulation layer, otherwise why call it elastic coating!

3. The external thermal insulation system adopts flexible putty + elastic coating, elastic putty + elastic coating can be, the difference between flexibility and elasticity is that the latter is more elastic and more resistant to cracking than the former.

The exterior wall is affected by thermal expansion and cold contraction, and can only use elastic putty and elastic coating. Only in this way can it be adapted to the change in climate without cracks.

It is the cracking of the sand ash, the insulation board can not absorb water, can only rely on the external temperature to evaporate the water, and if your sand ash is smeared at one time, and the sand ash is completely dry, cracking is inevitable, the specific method is to first smear a thin layer of sand and ash on it, as long as the mesh hole can be covered, and then wait for a day or two, the ash is completely dry and then wipe the second layer of leveling, I advise you to rework now, the cracked wall has no meaning, and putty powder will not crack, As for the second type for insulation, elastic putty is suitable for exterior walls.

There is a problem with the putty itself, and the anti-cracking mortar is not bad, and the paint is average, and it may be polyvinyl alcohol, so there are problems.

Generally, it is caused by the settlement of the wall, and it is recommended to use elastic putty + elastic coating.

According to the situation, it is likely that it is a putty powder problem. It is best to pick the crack with a blade on the spot to see.

If the putty is loose and the ash is removed, it is a putty problem.

It should be that the putty is not good.

Whether it is scraping white or pasting wallpaper, it is necessary to scrape putty on the cement wall in the early stage。Of course, the more times the putty is scraped, the more convenient it will be in the later construction, in fact, the main reason for scraping putty is to make the wall more flat, of course, the normal construction process of scraping putty is the most appropriate about three times, when the first putty is scraped, it is found that there is a crack in this situation, the most likely reason is because of moisture.

In other words, the air is not dry enough, and after the first putty, it is not air-dried normally but is dried in the shade, which is the most likely to cause cracks. Generally speaking, if a crack occurs, it is necessary to shovel out all the cracks around and do it again, otherwise cracks will still appear no matter how many times the crack is processed in the later stage. This is very important not to be afraid of trouble and ignore this behavior.

As a landlord, it is best to watch the workers on site during the pre-construction, otherwise the workers will directly cover this behavior with a second coat of putty powder.

If such a problem arises later, we can't find the parties, so although we hand over the decoration work to the decoration company, we have to leave a person on site to supervise their work at all times, after all, it is not their own business, they will focus on their own interests.

Moreover, as construction workers, they have a two-tier relationship with the landlord of the renovation company, and it is not an act between the employer and the employee, so they are most likely to cut corners, cheat, cheat, and slip

And these construction workers do not have a long-term relationship with the renovation company. If I have enough time, I even think it's better to do it myself in the renovation matter, and don't look for a renovation company.

Did the wall have a trunking buried before, and then the new cement was not completely dry, so the putty was scraped. After a while, it will definitely crack, and it will still crack if it is repaired, which is very troublesome.

The most likely reason is that the first putty has not dried and you have brushed the second putty, so the resulting cracks, are you using cement-based putty? Because the final setting time of cement is 3-5 days, and it takes 7 months to really dry, it is a hidden danger of wall problems during this time.

There are many reasons for putty cracking, 1. The previous putty is hung up before it is dry, and the dry and wet changes form cracks, 2. Temperature cracks are 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.

There are three causes of cracks in wall paints

1.The putty quality is really not good.

2.The ratio of putty powder, cooked rubber powder and water is incorrect.

3.When applying multiple layers of putty, apply the next layer before the previous layer dries4The new masonry wall is fake dry, the so-called fake dry is that the surface layer is dry, and the bottom layer is actually not dry.

1. After the putty is just scraped, if the ventilation problem is not handled well, the problem of cracking will occur in a few days. 2. If the construction is in humid weather, even if the putty does not crack, the problem of mildew will occur. 3. If the temperature difference is relatively large, it will cause internal stress, and the cracking time is also very short.

1. After the putty construction is completed, although ventilation is very important, do not ventilate excessively. The overall ventilation of putty will be good only if it is naturally dry.

2. It is best not to apply early travel in the wet season, if the putty can not be sharpened and dried in time, cracking and mildew problems will follow. You can choose to use fluorescent lamp drying for fast drying to avoid problems such as cracking or mold.

3. The putty is not completely dry, the putty is not leveled during construction, and the temperature difference of the putty is too large during construction, which will cause cracking.