As the winter season begins, various problems often arise in homes, among which is the appearance of dampness on walls and paint peeling. It is noticeable that during cold weather, wet spots appear on the walls; sometimes the paint swells, and sometimes its layer begins to peel off like a crust. Black and green spots may also appear in the wall corners. Initially, people tend to consider this an ordinary inconvenience and ignore it. Some decide to repaint the wall, while others try to dry the damp area by applying fabric or newspaper. However, such actions do not eliminate the problem, and after some time, dampness reappears on the wall.
In fact, there are many reasons for dampness appearing on walls in winter. The main causes include increased humidity inside the house, insufficient air exchange, water penetration into the walls, and water ingress from the roof. If these causes are not eliminated in time, besides paint damage, mold can appear on the walls.
In winter, the outdoor temperature drops significantly, which affects the house walls. The walls become cold, while the indoor air humidity constantly increases due to cooking, showering, drying laundry, and breathing. When the warm and humid indoor atmosphere comes into contact with the cold walls, the water vapor in the air begins to turn into fine droplets. This process is called condensation. Simply put, it is similar to the formation of droplets on the outside of a cold bottle of water in winter, just as moisture can accumulate on cold walls.
Initially, this moisture appears on window panes, in wall corners, and behind cabinets. If the room lacks a proper ventilation system, this moisture can persist for a long time, gradually leading to signs of dampness on the walls.
Before painting the walls, it is crucial that the surface is clean and dry. If there is already moisture inside the wall, it can weaken the adhesion of the paint. With constant water or moisture in the wall, the layer between the paint and the wall is damaged. As a result, small bubbles begin to form on the paint surface. Over time, these bubbles burst, and the paint starts to peel off in a crust.
Sometimes white powder also appears on the wall. This happens when water inside the wall carries dissolved salts to the surface. After the water dries, these substances remain as a white layer. This problem is called efflorescence. This is why applying new paint to a damp wall without eliminating the root cause does not bring long-term benefit, as the paint can spoil again.
First reason: insufficient air exchange in the house. In winter, people close doors and windows to protect themselves from cold air. This prevents internal moisture from escaping. Vapor formed during cooking, showering, and breathing accumulates in the room, gradually affecting the walls.
Second reason: water leakage inside the walls. If there is a leak somewhere in the house's plumbing, water can slowly penetrate the wall. Even a small hole in the pipe can lead to a constant inflow of water. At first, this goes unnoticed, but then wet spots, paint swelling, and signs of dampness appear.
Third reason: leaks from the roof. If there are cracks in the roof or rainwater accumulates, it can slowly seep inside. This affects the roof and the associated walls. Dark spots often appear in the roof corners, and the paint begins to peel off.
Fourth reason: drying clothes indoors. Since there is little sun in winter, people dry wet clothes in rooms. Water from the clothes gradually evaporates into the air, increasing the humidity in the room. If the windows are closed, this moisture can settle on the walls.
Fifth reason: cracks in external walls. Small cracks in the exterior walls of the house allow rain and moisture from other sources to penetrate inside. Furthermore, a damaged layer of paint or plaster may not prevent water penetration. This leads to the appearance of dampness traces on the interior walls.
Sixth reason: moisture rising from the ground into the walls. In some houses, moisture contained in the soil begins to rise up from the lower parts of the walls. This phenomenon is called capillary rise of moisture. In such cases, dampness, paint peeling, and the appearance of white salt layers may be observed at the bottom of the wall. This problem often occurs when there is no proper moisture prevention system between the foundation and the walls.
If you want to avoid dampness on your home walls in winter, you need to take some simple steps.



