The phenomenon of ground flooding mainly occurs on the ground floor of residential buildings. There are two reasons for this: First, when a humid air with a relatively high temperature encounters a low-temperature, smooth, non-absorbent surface, it is easy to produce condensed water on the ground surface. The second is that the water in the ground soil under the ground cushion rises through capillary action, and the vaporous water infiltrates upwards, making the ground material wet, which in turn deteriorates the humidity in the entire room. Residents on the ground floor often find that different levels of wetlands occur on the ground, especially in the spring and plum rain seasons, which directly affect the use of tenants and cause inconvenience to tenants. This article gives a brief analysis of the causes of ground floor flooding, and introduces several treatment methods and preventive measures.
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First, the reasons for the tide
Indoor wetlands mainly occur on the ground floor of residential buildings. Generally there are two reasons: First, when the humid air with a relatively high temperature (relative humidity above 90%) meets the ground with low temperature and is smooth and does not absorb water, it is easy to produce condensed water on the ground (usually the temperature is around 2°C). That will produce). Most of this happened in the rainy season, with lots of rain, high temperatures, and high humidity. Once the climate is clear and dry, the phenomenon of flooding can be eliminated. Second, the water in the ground soil under the ground cushion rises through the capillary action, and the upward infiltration of the vaporous water makes the ground material wet and aggravates the deterioration of the humidity condition of the entire room. This situation often occurs year-round and is more difficult to handle. In addition, there are outdoor drainage problems and poor ventilation of the room. Most of the southern part of the surface is mostly clay and sub-clay. The height of the clay pore water rises up to 2~2.5 meters, and the subclay reaches 1~1.3 meters. When the building materials with poor compaction are used as interior floors, the capillary action will be enhanced, and the phenomenon of ground flooding will be more serious.
Second, the inspection and treatment of the damp ground
1. Check. First check the ground for cracks. Cracks are the main channel for upward penetration of groundwater. Concrete mortar or concrete poured on the ground, generally cracks with a width of 0.05 mm or more are visible cracks. Regular cracks usually occur in the longitudinal or transverse direction of the room and are formed by shrinkage and cracking of the material. Then check whether there is empty drum on the ground. Use a wooden stick to tap the ground and tap it gently. If the sound of the tap sounds, there will be empty drums.
2. Cracks, empty handling. For regular cracks, a "V" joint should be cut and the inside of the joint cleaned and sealed with bitumen ointment. If you can use the flame to bake, make the cracks fully dry, the effect is better. Hairline cracks are generally closed for large areas. For areas where empty drums are available, the surface layer should be knocked out, the cushion be cut, and a grout brushed on the cushion. The same material as the surface layer should be used to repair the leveling.
3. moisture treatment. After the local treatment of cracks and empty drums, the surface layer shall be completely sealed and treated. The principle of treatment is to block the capillary water seepage channel in cement mortar or concrete. Can generally be painted waterproof coating or waterproof agent method. Before brushing, first cut the surface of the hair, clean, brush two waterproof paint. Apply force on the first brush to get it deep into the pores. After the first coat is dried (usually about 24 hours), it is painted again for the second time, so that the overall waterproof coating is formed. At the corners of the floor and wall, the paint should be brushed to the height of the wall skirting board.
After the original ground is damp-proofed, a new surface layer will be made. The selection of new surface materials should consider the use of high-strength, wear-resistant, have a certain moisture-proof ability, easy to clean, practical and beautiful surface materials, can also use cement mortar surface layer.
As for the air humidity, in addition to the special equipment needed to control the humidity, the general building should not open the window facing the wind, less open the door facing the wind, reduce the humid air into the room.
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