Causes of mildew of external cooling and internal heating wall in winter

The moldy wall with cold outside and hot inside in winter is caused by the temperature difference between the wall and the indoor air. When the indoor temperature is higher than the wall in winter, because there is a lot of water vapor in the indoor air, it will penetrate into the wall, while the internal temperature of the wall is lower than the indoor temperature, and the water vapor will be converted into cold water through condensation, and then penetrate into the building structure, thus forming the growth environment of mold. Over time, its internal humidity will be higher and higher, and the furniture and mattress after decoration will also be infringed, which will lead to the decline of air quality and damage human health.

In addition, the moisture-proof layer of the wall is also an important reason that affects the mildew of the wall with external cooling and internal heating in winter. If the moisture-proof layer of the wall is imperfect, damaged or not thick enough, the cold and hot convection will make the water vapor condensed on the wall surface unable to be absorbed by the moisture-proof layer, which will increase the humidity inside the wall and promote the growth of mold.

Another problem is that poor indoor ventilation may also lead to moldy walls, which are cold outside and hot inside in winter. When the indoor temperature is high and the humidity is high, it is necessary to ventilate in time to discharge the humid air, otherwise the water vapor in the air will condense on the wall to form water droplets, which will increase the humidity of the wall and make the growth environment of mold more suitable.

In view of these problems, measures should be taken in time, such as increasing the moisture-proof and heat-insulating materials of the wall, repairing the moisture-proof layer of the wall, realizing good indoor ventilation, reducing indoor moisture evaporation, etc., to effectively prevent and solve the moldy problem of the wall with external cooling and internal heating in winter.