Why do lightweight gypsum mortar walls peel?

The wall is peeling, that is, the wall is peeling. The specific reasons and solutions are as follows:

1. How to deal with the hollow part of the paint layer:

Knock out the hollow part Go and repaint the wall. When painting, you need to pay attention to the fact that the wall needs to be wet the day before painting. The thickness of the paint at one time should not be too thick.

2. When the wall is painted, the indoor humidity is relatively high, resulting in moisture return, which causes the paint layer applied later on the wall to peel.

Processing method:

It is necessary to remove the paint layer, ventilate the room, and wait until the indoor humidity is not too high before starting the paint application.

3. Because the wall has been in a humid environment for a long time, for example, there is water on the other side of the wall for a long time, or there is a cavity in the wall, and it gets damp after rainy days, causing the indoor wall to peel.

Treatment method:

Find out the water-permeable area on the other side of the wall, shovel off the paint layer, use cement mortar with a higher grade to fill the hole, and paint. The treatment on the inside of the post-treatment wall is also carried out using a method similar to 1.

4. Foundation settlement leads to cracks and peeling

Generally, there will be a process of foundation settlement in a new house within one or two years of moving in. The wall stretches during the settlement process, which will cause cracks in the wall or peeling and cracking of the wall surface. During the foundation settlement process, don’t rush to partially repair the wall. Wait until the settlement period of 1-2 years gradually stabilizes before you start repairing the wall.

When the developer delivers the house, the walls are plastered with plain ash. When the workers paint the walls, they must shovel off the base ash and repaint the base coat with primer. If workers do not clean the base layer during decoration, it will cause the wall to peel and crack for a period of time after applying latex paint. Some decoration companies cut corners in order to save money when decorating for owners, and the ratio of raw materials is unreasonable. For example, the moisture in the lightweight gypsum mortar paint is too much.

Solution:

1. Small area of ​​epidermis peeling and cracking. Just shovel off the peeling part and the surrounding wall skin, and replace it with paint of the same color; if latex paint is used during decoration, the second treatment method is also to apply glue, which can reduce the color difference between the local and the overall color.

2. For large areas of peeling and cracking, you can only shovel off all the paint and light gypsum mortar on the wall, paint the cracked base with white latex, stick it with solid cloth, and apply light gypsum mortar, etc. After drying, sand it with sandpaper and then reapply paint. If the cracks are deep, this part should be covered with gypsum board separately.

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