Main causes of external wall leakage treatment met

2022-07-22
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Water seepage from the outer wall is a headache, and now there are more householders of water leakage from the outer wall and indoor water, and they are helpless in the face of these problems, and do not know how to deal with them. Water leakage from the outer wall refers to the phenomenon of water seepage from the outer wall of the house caused by some reason in the process of building construction, and once there is water seepage from the outer wall of the house, it is difficult to find the source of water seepage, This is because of the differences in the structure, exterior wall practices, construction technology, etc. of housing buildings, and the reasons for water seepage are also different. Do you know the treatment methods for water seepage from exterior walls in life

water seepage from the external wall is a headache, and now there are more householders of external wall water leakage and indoor water leakage, and they are helpless in the face of these problems. They don't know how to deal with them. External wall water leakage refers to the phenomenon of water seepage from the external wall of the house due to some reason in the process of building construction, and once there is water seepage from the external wall of the house, it is difficult to find the source of water seepage, This is because of the differences in the structure, exterior wall practices, construction technology, etc. of housing buildings, and the reasons for water seepage are also different. Do you know the treatment methods for water seepage from exterior walls in life

I. main causes of external wall leakage

(I) design factor

waterproof treatment is an important quality project in housing construction engineering. In practice, based on the differences in the performance of waterproof materials and the climate in the South and north of China, the waterproof design of the house has a certain complexity. Once the waterproof design of the project has problems, it will directly cause the leakage of the outer wall of the house

(II) material factor

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 mortar joints, especially the cement mortar in the vertical joints, are generally difficult to achieve the effect of plumpness and compaction. The connection positions between the wall and the reinforced concrete beams and columns, and between the window frame and the wall often form cracks due to the different properties of materials, resulting in the leakage of the wall

(III) construction factors

from the perspective of construction, there are relatively many external wall leakage problems of housing buildings caused by construction technology and construction technology:

first, tie bars are not buried in the connection position between the external wall column of the frame structure and the relevant point, and the setting of tie bars is not firm, or the spacing, length and quantity of tie bars do not meet the standard requirements. When the difference in temperature expansion coefficient is relatively large, It will cause cracking at the connection position and form a water leakage prone area

second, during the construction of building wall, the mortar of leveling layer and plastering layer is not configured according to the standard design, which leads to the change of mortar strength and the leakage of wall based on the occurrence of dry shrinkage and cracking

third, during the construction process, there is a problem of insufficient adhesion between the external wall tiles and the priming mortar, which leads to the occurrence of hollowing diseases. The pointing of the facing tiles is not dense enough, causing trachoma or cracks, causing water seepage on the wall

fourth, the construction of such details as the slope of the building windowsill, the drip trough and the olecranon was not handled well during the construction, which was easy to cause wall leakage due to rainwater infiltration

fifth, in the process of building construction, the sealing treatment of various pipes passing through the outer wall and different reserved holes is not done well, which will also cause the leakage of the building wall

in a word, there are many factors causing the external wall leakage of housing construction projects in China at present. In order to ensure the overall quality of housing construction in China and avoid the occurrence of external wall leakage, it is particularly necessary to strengthen the research on the water-resistant treatment methods of external walls of housing projects

II. Prevention of external wall leakage in construction

1. For the blockage of scaffold, the more effective method is: first flush the sundries in the scaffold eye with water, and then use 1:2 cement mortar to build half bricks to the inner side of the scaffold eye. The mortar joint should be blocked and full, and it can be tamped with thin steel plate. Then use C30 fine aggregate concrete to fill the outside of the scaffold eye, go deep into the wall to the outer wall for 10mm, and the amount of cement in the concrete should be 5%— Prepare 8% waterproof agent or micro swelling agent. After drying, use 1:2 cement mortar to trowel and polish the wall. Although there are many processes in this treatment, it has an obvious preventive effect on preventing water seepage from the outer wall

2. The plumpness of masonry mortar is specified in the specification, “ The plumpness of horizontal mortar joints of hollow brick masonry shall not be less than 80%, and the vertical mortar joints shall be filled with mortar, and there shall be no transparent joints, blind joints and false joints ”. The consistency of masonry mortar should be correctly selected according to the hollow masonry, and the mix proportion should be calculated and adjusted by trial mixing; Adopt “ Sany ” It is forbidden to “ Dry bricks on the wall ”, The bricks shall be watered before masonry

3. Add a 15m outer opening and 30mm inner opening of the wall at the joint of each layer of reinforced concrete ring beam and masonry. The center of the wall is a tongue and groove shaped impermeable mortar layer with a mortar mix ratio of 1:3, mixed with 3% waterproof agent, and then pour the concrete ring beam. The specific construction method is as follows: after the masonry is built to the top, it is watered and wetted, and then the impermeable mortar layer is paved, and the surface is calendered as it is paved. After 24 hours of curing at room temperature, the impermeable mortar layer reaches a certain strength, and then the next process of reinforcement binding and formwork erection can be carried out. After treatment, it can effectively prevent water from leaking from high to low along the wall. If there is leakage, there will only be leakage points on this floor

III. treatment of external wall leakage

for the external walls of buildings that have leakage, there are three main treatment methods at present:

1. All external walls should be waterproof again

the advantage of this method is that it can completely solve the leakage problem, but it is time-consuming and laborious, and the capital investment is too large, which is often not realized in practice

2. Focus on the treatment of leakage parts

adopt the method of opening holes and grouting for local treatment of leakage parts, but because it is the treatment of the structure, it is often difficult to get the cooperation of residents, easy to misunderstand, and difficult to deal with. Moreover, it can only cure the surface, and cannot fundamentally solve the problem. Often, after dealing with a leak, the water may leak out from another weak point

3. Use organic polymer waterproof materials to treat the external wall as a whole

at present, this kind of products in the market are mainly permeable waterproof agents based on silicone, and the requirements for the base course are not high. After cleaning the base course, mix the cement with crack repair agent to fill the large holes and cracks on the wall tightly, and then spray the waterproof agent directly on the outer wall with a spray. The waterproof agent can penetrate into the cement base course for more than 1cm, which is related to the free calcium oxide Tetracalcium aluminate reacts to produce calcium silicate, aluminum silicate and aluminum hydroxide flocs that are insoluble in water to block the cement-based pores and form a permanent waterproof layer that is both breathable and hydrophobic. Rainwater falls on it like dripping on lotus leaves, leaving no traces of water. The wall surface will always be in a dry state to achieve the purpose of waterproof. This treatment method is simple, easy, low-cost, and has good treatment effect

editor's summary: the relevant information about the main causes of external wall seepage and the treatment methods of external wall seepage is introduced here. I hope this article will be helpful to you. If there is anything else you don't understand, you can leave a message to Xiaobian below, and we will answer it for you as soon as possible

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