The reason for the reflux of moisture on the wall
- Structural reasons
Filtering water from the outer wall will cause the moisture to be removed. Usually, cracks appear on the exterior walls, and the water-impermeable layer of the building's exterior walls is damaged or there is no insulation or insulation. The bathroom and kitchen waterproofing is not done properly, and the wet wall surface will cause moisture to fall off the skin.
2. Reasons for decoration and construction
During the decoration, the wall is not dry, and the indoor air is heavily humid. If the wall is not dry, the wall is fixed and painted, resulting in the moisture being sealed inside the wall, and then putty or foundation boards are constructed. For a long time, the moisture and moisture in the wall are too heavy, resulting in mold and peeling.
The waterproof construction quality of the balcony and bathroom is not standardized. Water leakage in the water pipe will cause water to leak backwards, or cracks at the intersection of the baffle and the wall are under the balcony window, or the low sealing performance of the window will cause external rainwater to seep into the room, which will also cause mold and peeling on the wall.
3. Environmental reasons
summer south s rainy, high air humidity, humid coastal areas, cold winter climate in the north, cool walls, high indoor temperature, easy to produce condensation. The insulation of the exterior wall itself is not done well, which causes the wall to be cold and cold. The indoor water vapor will crystallize into water droplets on the wall, and the wall will become moldy and hairy when it gets damp.
What should be done if the wall is moist and moldy?
- When the wall is moist and moldy, the first thing is to remove all the bubbled parts and double the size around the peeling area. If it is only localized wall bubbles, you can only scrape the bubbled parts;
- After the wall latex paint is removed, the large sand layer of the cement on the foundation of the wall can also be removed, so that the water inside the wall can be further emitted, and the liquefied gas flamethrower can be used to bake the moisture rebuilt wall at high temperature, so that the water vapor inside the wall can be reduced, and the water vapor inside the wall can be reduced, and the drying time will be two days;
- After the wall is dry, use coarse sandpaper to grind the wall to sand off some cement sand that has not been removed;
- apply interface on the foundation layer or isolation sealant;
5. Then apply polymer waterproof cement mortar , and after waterproof mortar dry, then use waterproof putty brush;
6. Try to use waterproof putty to level the putty. It is recommended to scrape 2-3 times. The thickness should be controlled below 0.2mm if not.
7. After the putty is fully dried, it is polished;
8. Start painting the wall with other processes such as latex paint, sticking wallpaper.
How to prevent moisture from walls
1. Choose materials with good breathability
When building walls, try to choose materials with good breathability, such as non-woven fabrics, wallpapers, wood fiber materials, wall cloth , etc. If the wall is damp and the situation is not serious, it can be emitted through the surface. Otherwise, the moisture will be stuffy inside the wall and cannot be dissipated, and it will be prone to mold, peeling, falling off after a long time. Phenomenon;
2. Take moisture-proof measures
. In the weather in the south, the doors and windows need to be closed tightly to avoid water vapor entering. If conditions permit, the dehumidification function of the air conditioner can be turned on for dehumidification; you can also use the dehumidifier for dehumidification to reduce the water vapor in the room; you can also place desiccant and limestone in places with relatively large humidity in the room, which can also effectively reduce the humidity in the room.
and above are introduced here on the reasons for the moisture-ripped and peeling of the wall and how to deal with it. I hope it will be helpful to you. The wall must be treated in time after it is damp, otherwise the situation will become more and more serious. After treatment, corresponding moisture-proof measures must be taken to avoid moisture again.
