Causes of water leakage in exterior walls, what are the causes of water leakage in exterior walls

The reason for the leakage of the exterior wall is actually very simple, that is, the waterproof layer of the roof is not done, if the waterproof layer is not a problem, the water will definitely not leak in, if the building leaks, the leakage problem must be solved, otherwise it will become more and more serious.

There will be problems after living in the house for a long time, so we have to conduct regular inspections of the house, and some houses will have the problem of wall leakage, at this time, oh we have to solve it, and we have to find out the cause before solving it, thenLeaking exterior wallsWhat are the reasons? How to deal with water leakage in the exterior wall? If you want to know more, let's take a look.

First, the cause of water leakage on the exterior wall.

1.The various new wall materials used in modern housing construction basically have the characteristics of large porosity, strong water absorption and poor anti-permeability. Therefore, in the process of masonry, the cement mortar in the mortar joints, especially the vertical joints, is generally difficult to achieve the effect of fullness and squeezing, and the connection position between the wall and the beams and columns of reinforced concrete, the window frame and the wall is often cracked due to the difference in the performance of the material, and then causes the leakage problem of the wall.

2.If the connection position between the external wall column of the frame structure and the relevant question is not buried, the setting of the tie bar is not firm, or the spacing, length and quantity of the tie bar do not meet the requirements of the standard, when the difference in temperature expansion coefficient is relatively large, it will cause the cracking of the connection position and form a frequent area of water leakage;

3.During the construction process, there is a problem of insufficient adhesion between the exterior wall bricks and the mortar of the priming, which then causes the occurrence of hollow drum disease, and the joints of the facing bricks are not dense enough, and the problem of trachoma or cracks occurs, causing water seepage on the wall;

Second, how to deal with the leakage of the outer wall teasing socks.

1.When the gap on the surface of the wall is wide, the gap should be moistened by sprinkling water first, and the inorganic waterproof plugging material (water leakage, quick-drying cement, etc.) should be used to fill it. When the gap on the surface of the wall is narrow, the waterproof coating such as polyurethane waterproof paint is used to paint the gap, and the thickness of the coating film can be controlled when brushing, and the width of the gap should be based on whether the inorganic waterproof plugging material can be filled as the standard, and when it can be filled, the wider crack should be included.

2.Leaking pipes can also lead to leaks in the house, which may be caused by problems at the junction between the pipes and the floor, and the contact surface between the pipes and the floor slabs is not fully closed, which can also lead to water leakage. This solution only requires the closure of the non-closed area between the pipe and the floor slab.

3.The weight ratio of Laoyal mortar waterproofing agent to cement and sand is 1:2:

6. Mix and stir into a waterproof mortar, apply it to the place to be repaired in an ordinary plastering way, and at the same time level the base surface by the way. Add water to mix with Lloyal water without leakage according to the water-cement ratio of 1:3, quickly stir into a slurry, knead it into a clay ball by hand, and press it tightly at the V-shaped groove when it is slightly hot.

Sometimes there will be a problem of leakage in the house, especially the leakage of the wall, so what are the causes of the leakage of the exterior wall and its treatment methods, and the above introduction is also known to everyone about these problems.

Although water seepage on the exterior wall will not affect the overall structural safety of the house, the problem of water seepage will directly damage the decoration effect. Once it rains, the rainwater will seep into the room along the cracks, causing the walls to become damp and mildew. Water seepage from the exterior wall is a very troublesome thing, so find the cause of the leak on the exterior wall of the house and then arrange for treatment as soon as possible.

Let's introduce the relevant knowledge!

Analysis of the causes of water leakage in external walls:

1. Cracking of the exterior wall, cracking of the indirect joints of the brick masonry and shear wall.

2. The quality defects of exterior wall putty and poor crack resistance; Or due to improper construction operation and improper proportion, the putty scrapes the wall due to shrinkage and cracking.

3. The walls and roots of the raft are not cleaned, and the seepage channel leads to root leakage.

4. Decorative surface, missing corners of the bricks, broken, etc.

5. The decorative surface is uneven.

6. Marble glue is not real, missed, etc.

7. After the hole infiltrated into the tie rod of the branch mold is removed and the mold mast is removed, the hole is not effectively blocked and directly covered with cement.

8. The liver support part of the installation support point is fixed on the shear foot, and the rear bracket hand frame is untreated.

Pre-treatment method of water seepage on external walls:

1. Cut the cracks in the base layer into a "V" shaped groove, with a width of 20mm at the upper mouth, and sweep it clean, and then brush it with waterproof and mortar.

2. First of all, check the water seepage on the wall, most of the walls have cracks, and now most of them are insulation boards, mainly the gaps between the insulation boards, and some roofs are waterproof and do not cause high water seepage.

3. Repair the cracks on the wall, look at the corresponding water seepage area of the exterior wall, see if there are obvious cracks, if there are small cracks, directly apply the waterproof glue 2 times, and then brush the exterior wall twice, pay attention to the waterproof glue brush above the water seepage site, there is no need to brush below the water seepage site. If you treat the exterior wall surface, if it still seeps water, you must consider the leakage of the roof. It is often used on the top layer, and it is best to waterproof the top layer.

4. If there are big cracks, we must see if there are cracks between the insulating plates or cracks in the original putty layer. If the original putty layer cracks, then we have to shovel putty around the cracks, then scrape the mortar for the cracks of the exterior wall, then glue it to the lattice, scrape off the elastic putty of the exterior wall twice, and then dry the exterior wall paint and dry it.

5. It is more troublesome to deal with the cracks between the insulating plates. Find the outer wall surface of the seepage part, remove the adjacent insulation board, rehang the insulation board, then scrape off the surface mortar, scrape off the putty, and brush the exterior wall paint.

(1) Design factors

Waterproofing treatment is an important quality project in housing construction engineering. In practice, based on the difference in the performance of waterproof materials and the difference in the climate between the north and south of China, the waterproof design of the house has a certain complexity, and once the waterproof design of the project has problems, it will directly cause the leakage of the exterior wall of the house.

(2) Material factors

The various new wall materials used in the construction of modern wide houses basically have the characteristics of large porosity, strong water absorption and poor anti-permeability. Therefore, in the process of masonry, the cement mortar in the ash joints, especially the vertical joints, is generally difficult to achieve the effect of fullness and compacting, and the walls and reinforced concrete. The connection between beams and columns, window frames and walls often form cracks due to the different properties of materials, which in turn causes leakage problems in the wall.

(3) Construction factors

From the perspective of construction, there are relatively many problems of external wall leakage caused by construction technology and construction technology

First, the connection position between the outer wall column of the frame structure and the relevant question is not buried, and the setting of the tie bar is not firm, or the spacing, length and quantity of the tie bar do not meet the standard requirements, and when the difference in temperature expansion coefficient is relatively large, it will cause the cracking of the connection position and form a frequent area of water leakage;

secondly, in the construction process of the building wall, the mortar of the leveling layer and the plastering layer is not configured in accordance with the standard design, which causes the change of mortar strength and causes the leakage of the wall based on the occurrence of dry shrinkage cracking problem;

Thirdly, in the construction process, there is a problem of insufficient adhesion between the exterior wall bricks and the mortar of the priming, which then causes the occurrence of diseases in the hollow drum early coincidence, and the joints of the facing bricks are not dense enough, and the problem of trachoma or cracks occurs, causing water seepage on the wall;

Fourth, the construction of the slope of the window sill, the drip chute and the olecranon and other details of the building is not well handled during the construction, which is easy to cause wall leakage due to rainwater infiltration;

Fifth, in the process of building construction, the sealing treatment of various pipes through the exterior wall and different reserved holes is not done, which will also cause leakage of the wall of the building building.

In short, there are many factors that cause the leakage of the exterior wall of the housing construction project in China, and it is particularly necessary to strengthen the research on the anti-water treatment method of the external wall of the housing project in order to ensure the overall quality of the housing construction and avoid the occurrence of the problem of external wall leakage.

1. Water seepage around the perimeter of the exterior wall door and window framesGenerally speaking, if there is a leak in the outside wall, it is usually caused by the wall next to the window. This is mostly due to the fact that the gap between the contact surface between the door and window frame and the brick wall is not sealed, or although it is filled with mortar, it is not dense, and there are often falling off and cracks, and there is no drip line on the top surface of the window opening, and the rainwater flows into the room from the top surface of the hole.

The mortar is not full in the cracks of the masonry under the windowsill, and water seeps into the room through the cracks.

2. Legacy problems in the construction process:If we do not handle it properly in the construction and do not dismantle some facilities attached to the exterior wall in time, it will also form a seepage channel to a certain extent, such as the removal of tower cranes, construction elevators, scaffolding, etc.

Precautions for exterior wall waterproofing

For exterior wall waterproofing treatment projects, for some high-rise buildings, the project implementer needs to have a high-altitude work certificate. In the process of waterproof masonry of the exterior wall, it is necessary to avoid the re-jointing and light transmission of the exterior wall. The mortar joints should be even. The interface between the wall and the beams and columns should be cleared of waste slurry.

The bricks of masonry should be wet. The masonry wall must not reach the top at one time, it should be completed in two to three times to prevent the mortar from shrinking and make the exterior wall completely firm. In addition, it is necessary to pay attention to the flatness detection of the wall to prevent the batch mortar in the next process from being too thick or too thin.