What to do if cracks appear on the wall after one year of renovation? Method of applying latex paint on putty wall

The paint in my home has cracked after one year of decoration. What's going on? In fact, there are many reasons for this phenomenon, such as cutting corners when applying latex paint, or it may be because the terrain is too low. You can ask the decoration company or property management to solve it. For details, you can read the introduction provided by this website.

What to do if cracks appear on the wall after one year of renovation

Dealing with the situation in the first picture

The alkali reaction on this wall is quite serious. It can be determined that there is a problem with the waterproofing of the exterior wall. When it rains, rainwater penetrates into the wall, causing moisture to move to the inner wall, destroying the base and surface layers of the inner wall. If this situation is not dealt with for a long time, it will cause the instability of the wall structure.

First of all, you need to notify the property management to waterproof the exterior walls. If you do not waterproof the exterior walls and only deal with the interior, this situation will happen again soon.

After finishing the exterior wall, scrape off all the peeling parts of the bay window, and then check whether the upper part that has not peeled off is firmly bonded to the base. If it is loose, continue scraping until the wall surface is solid.

Remove all loose putty layers to expose the wall base. If there are holes or cracks, first use cement mortar to level the wall. After drying, clean the loose soil on the base, use putty to level the entire area, apply an alkali-resistant primer after drying, and then use white paint to repair the damaged part of the wall.

Dealing with the situation in the second picture

The second picture looks like the location of the window frame. If it is confirmed to be this location, the main reason for the cracking is the cracking caused by the different tensions at the interface of the two materials.

For example, the joint between the artificial board of the window frame and the base of the wall is very flat after the putty is applied, but the tension of the two materials is different. For example, the base of the wall does not change much when it is hot, cold, dry, or wet, while the artificial board will produce various tensions under the influence of the environment, deforming when dry and expanding when wet. Therefore, when the ambient temperature changes greatly, expansion cracks are prone to occur.

You can scrape off all the 3 to 5 cm putty layer on both sides of the crack. After preparing the base layer, add a layer of mesh cloth, and then apply putty. After the putty is dry, use white paint to touch up the color.

Dealing with the situation in the third picture

The situation in the third picture is much better than the first one. It is mainly because the base layer is not adhered well enough after being exposed to moisture, which causes it to fall off and crack.

The moisture in this picture is caused by the water vapor on the bay window wall evaporating to the top. There is no alkali reaction phenomenon, so there is no need to apply anti-alkali primer.

The fallen area can be scraped off. It is recommended to scrape a slightly larger area, extending about 5 cm to the periphery. After scraping off the base layer, add a layer of mesh cloth to scrape putty, and after the putty layer is dry, use white paint to fill the color.

How to prevent wall cracks

The cracks on the wall are first attributed to the wall processing technology. The developer usually comes with whitewash when accepting the house. The wall skin needs to be scraped off during decoration. After scraping off the wall skin, the cracks on the wall are generally clearly visible. Clamp the seams, hang the net, scrape the plaster, and then brush the strong paint to achieve a better combination of the wall and putty to prevent hollowing. Hang plaster locally or fully for leveling, then putty for leveling, polish and brush latex paint.

Nowadays, high-rise buildings all have light walls. After painting with latex paint, you will find that there are many fine lines due to problems such as drying and compactness of latex paint. If you don't care too much, painting with latex paint is the most environmentally friendly. If you care, then paint with base film after sanding. Pasting wallpaper, wall coverings, etc. are also good choices.

How to apply latex paint on putty wall

After applying two coats of putty powder, it needs to be polished again (this polishing is critical! Otherwise, no matter how good the latex paint is, it will not work! Responsible masters will polish it little by little with a light bulb. The quality of polishing is directly related to the effect of subsequent latex paint painting! It can be said that half of the wages are spent on polishing!)

It is best to apply latex paint every two to three days. If the time interval is too long, the putty powder will easily be oxidized by the air, and in severe cases it may cause falling off later.

The general latex paint process is one coat of primer and two coats of topcoat. If you want to achieve the best effect, don't skimp on primer.

There are two ways to apply latex paint, one is rolling and the other is spraying, each has its own advantages and disadvantages, but to achieve the most perfect effect, spraying is generally the best. Of course, rolling by a good master is also good, but it requires a high level of skill.

Here comes the point! How can you achieve a smooth and glossy effect like silk?! The answer is that you need to carefully sand it after each coat of latex paint (sanding is also the most challenging part for the craftsman! And you need to use the finest sandpaper!), that is to say: sand it after applying the primer; sand it again after applying the first coat of topcoat! Finally, apply another coat of topcoat!

Here is a very practical way to check the painting effect. Use a flashlight to shine a beam of light on the edge of a wall. Wherever there is a shadow, there is unevenness! And you can also find out whether the master has handled the details well!