Example analysis of external wall seepage

>>> Wall moldy solution

User situation direct hit:

My home decoration was poor and the floor was floored. It was found that some of the eastern wall had seepage. The decoration team's plan was to blow the foaming agent in the wall under the window. Later, according to the "observation" of the decoration workers, it was the problem of the window, and then he madly hit the silica gel. The decoration team said that the foaming agent's livelihood could not be done, and it was useless to play. Her husband asked the neighbors downstairs, indeed they hit or seepage. However, the property insisted on calling us to play foam and found leaks to make up for the external walls.

As soon as the typhoon arrived and water seepage occurred again, it was found that there were indeed problems with the external walls. The property clamored that we did not play foam, and said we installed a fence to repair the facade (we were the top floor). External wall seepage, in the end is the blowing agent or repair it?

Expert Reviews:

Water seepage in the East Wall is a frequent occurrence in Shanghai, which is related to the geographical location of Shanghai.

This is usually the case due to the aging of the external walls of the building. If it is a new house, it may be a problem for developers and constructors.

The problem of water seepage cannot be completely solved in the room and it must be done outdoors. If leaks are found indoors, they will be found on other walls even if they are repaired. Even if the exterior wall of the building is poured from concrete, there will be more or less capillary holes.

The popular point, if only repairing the interior walls, is not to make up, only to repair the external walls only to repair completely! And this belongs to the maintenance of the property areas, the general new residential properties will be home repairs. In the old-fashioned community, due to the problem of maintenance funds, most will shirk! Owners are required to negotiate, or bear maintenance costs!!!

What are the prevention and control measures for the seepage of external walls ?

External wall seepage is a common phenomenon in the Jian'an project, which seriously affects the indoor living environment. At the same time, due to the presence of water, it also brings hidden dangers to the safe use of the structure. The external wall seepage is a common phenomenon in the Jian'an project, combined with work practices. The causes and prevention methods of external wall leakage are analyzed and discussed as follows:

First, the type of wall leakage and analysis of the reasons

l. Inconsistent deformation of brick masonry and concrete components Because the expansion coefficient of reinforced concrete components is about twice that of brick masonry, under the same temperature difference, the expansion and contraction of reinforced concrete is greater than that of brick masonry, and the winter and summer will alternate. Temperature stress cracks occur, causing leakage, and the locations where temperature cracks are prone to occur are mainly the windows, gables and parapets of the top floor of the long buildings.

2. Foundation uneven settlement temperature deformation dry and wet deformation caused by cracking leakage

When the temperature changes, the component will be deformed. When the deformation is constrained, it will produce temperature stress. When the temperature stress is greater than the tensile strength of the wall, cracks will occur and leakage will occur. In the winter in the northern regions, the winter insulation measures are unreasonable. Prone to frost heaving caused by cracking, generally easy to occur in the bottom of the base strip, below the window and other parts.

3. Leakage caused by gaps in externally cultivated lightweight wall masonry

The coefficient of thermal expansion of the lightweight bricks of the external wall, which plays a role of filling instead of load-bearing, is larger than that of the clay bricks. Therefore, after the winter or summer alternately or strongly under the sun, sudden changes in the temperature of the rain, cracks will inevitably occur between the lightweight brick and the concrete frame beams and columns. At the same time, the lightweight brick itself has some factors such as large shrinkage, large amount of water absorption, low surface strength, and easy-to-powder, etc.

4. Leakage of external wall decoration causes leakage

The plastering of the exterior wall is not overlapped or uneven, or the residue of the mortar is not cleaned so that the rainwater accumulates in the sub-grid seam. The sub-grid is embedded too deep so that the thickness of the plastering at the bottom of the sub-grid is not enough, and the rainwater seeps into the wall; Before the brick wall was stuck, the holes and gaps on the wall were not seriously blocked; the joints between the facing bricks were not serious or the mortar marks were low to form capillary holes, and leakage occurred under the action of wind pressure.

5. Leakage around the door and window openings causes leakage

At present, most of the doors and windows of buildings are made of aluminum alloy, plastic steel, and white steel, and cracks are generated between their interfaces due to temperature changes, and leakage occurs due to lack of sealing materials or poor sealing and poor quality of sealing materials.

6. Improper detailing causes leakage

In many components of exterior wall, it is easy to cause leakage such as provocation, canopy, balcony and decorative lines outside the protruding wall, etc.

If not doing the drip line or doing non-standard, causing the water to flow along the outer wall; In addition, when the construction of the piling and masonry, the lead wire hole and the foot hole of the fixed scaffold are not strictly blocked, and the mortar of various masonry bodies is full. Less than requirements, not full of gray seams and so on are easy to leave the channel of seepage.

Second, the external wall leakage prevention measures

By analyzing the various types and causes of the leakage of external walls, prevention and treatment of these problems will achieve good results.

1. Effective control of wall cracks

Whether it is a cast-in-place reinforced concrete structure, a masonry structure, or a frame structure, it is difficult to completely avoid the generation of cracks due to the influence of external natural conditions. There are also door and window openings, and holes in the walls of the hand-eyes, etc. These are easy to leak. In the weak link, construction should be strengthened in management, strict quality control and preventive measures must be taken.

2. Improve the construction process and improve the impermeability outside the external wall

For example, if the wall sub-grid seams are prone to leakage, we can use glass strips, disposable plastic sub-grid bars, etc. The exterior wall facing bricks use polymer cement mortar to weaken the brittleness of the cement mortar; the outer wall leveling layer is like In case of different metal materials, the additive metal field resists cracking caused by the different number of linear expansions of different materials; plastering sand must be strictly controlled to contain mud, and the use of wind and sand should be avoided; and the importance of detailed structures must be fully understood. Minimize wall leakage.

The causes of the external debt leakage are very complex. It involves all aspects of the design, construction, and use of the building. It has both commonalities and regional characteristics. It seriously affects the smooth and stable development of users, and it is hereby proposed to discuss with the industry. Jointly treat the external wall seepage.

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