How to waterproof walls

Question 1: Under what circumstances does the external wall need to be waterproofed? If it is waterproofed, what should be done to make it convenient? 1. The external wall itself needs to be waterproofed. This is clearly required in the building regulations. It just depends on whether it is a simple treatment (rigid waterproofing) during the actual construction, or whether it is a strict and serious waterproofing layer for the exterior wall.

2. Exterior wall waterproofing is also divided into rigid waterproofing and flexible waterproofing.

3. When plastering exterior walls, general construction companies will add a water-repellent agent or waterproof powder to the cement mortar to achieve a waterproofing effect. This is rigid waterproofing. This method is simple to construct. You only need to add a certain proportion of hydrophobic agent or waterproof powder when the cement mortar is pre-mixed. The rest of the construction method can be treated as plastering. At the same time, the eyes of the concrete PVC vent pipe must be filled tightly with foaming agent, otherwise it will be extremely easy to leak.

4. Flexible waterproofing of exterior walls generally depends on Party A’s budget, because the price and cost of flexible waterproofing of exterior walls is still not low.

5. If the exterior wall is to be made flexible and waterproof, it is usually made of flexible waterproof coating (cement-based), such as Js waterproof coating, etc. The construction is generally done by spraying or brushing after the base layer is plastered. The construction process is not complicated, but it is still difficult to meet the thickness requirements of the waterproof layer when constructing the exterior wall facade, and there is also a lot of material waste (more floor materials).

6. In addition, when the external wall insulation is constructed to the anti-crack layer, the anti-crack mortar (or plastering mortar) should be waterproof. This will directly increase the budget cost of insulation. Because the market price of ordinary exterior wall anti-crack mortar (surface plaster mortar) is generally 800 to 1,400 yuan/ton, if it is to have waterproof function, the cost will increase by more than 20 yuan. Moreover, only experienced manufacturers can produce crack-resistant mortar (pasting mortar) that is truly waterproof. Many materials on the market that claim to be waterproof and crack-resistant mortar are actually not waterproof at all.

7. In addition, exterior wall paint is waterproof. Waterproofing of exterior wall paint generally requires exterior wall primer (sealed primer) with waterproof function. At the same time, exterior wall putty must be waterproof putty (many so-called waterproof putties on the market actually do not have waterproof function), and exterior wall topcoat must have good flexibility. and weather resistance. At the same time, the construction quality is excellent and the number of coating passes meets the requirements. In this way, exterior wall paint can also play a waterproof role.

8. The waterproofing of exterior stone and curtain walls mainly relies on weather-resistant special glue for joints of stone and curtain walls. The quality of the glue determines the quality of the waterproofing effect, and the quality of the construction also determines whether it has waterproofing effect.

9. Some parts of the exterior wall must be waterproofed. (Such as settlement joints, grating joints, around windows, pipe holes in exterior walls, supports for downpipes and gas pipes, etc.)

Think of the above for now.

I hope it can be of reference to you.

Question 2: How to waterproof the wall? There is no need to waterproof the inside. If you have a washing machine here, you can cut off 1.5 meters of the outer wall and clean the wall. Apply cement-based polymer waterproof coating twice (thickness 1.0 mm); after chipping away and cleaning the original balcony floor tiles, apply cement-based polymer waterproof coating twice (thickness 1.0 mm).

The junction between the wall and the ground and the corners of the wall should be especially thin and waterproof. After the waterproof layer is completed, block the floor drain and fill the balcony with water (about two centimeters above the ground). water) do a closed water test (24 hours). If there is no water leakage, you can apply a protective layer of cement mortar and finally put the ceramic tiles back on (if the water supply pipe of the washing machine is to be buried secretly, also check whether the water pipe joint is leaking).

If the balcony floor is higher than the drainage floor drain opening, the surrounding area of ??the higher part needs to be plastered with cement slurry (or painted with waterproof coating) to avoid water edges. Waterproofing treatment methods for the floor and wall:

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Be sure to level the ground with cement mortar before doing waterproofing treatment, so as to avoid leakage caused by uneven thickness of waterproof coating.

Before doing waterproofing, be sure to clean the ground and apply it 2 to 3 times with polyurethane waterproof coating

. The joints between the wall and the ground and the joints between the water pipes and the ground This is the place where problems are most likely to occur. Workers must be supervised to deal with these corners, and waterproof coating must be applied in place. The decoration team is required to provide cement mulch for the upper and lower water pipes in the kitchen and bathroom, and apply polyurethane waterproof coating 10 to 20 cm upward from the ground. Then the ground is redone with polyurethane waterproofing, and the original waterproof layer is added to form a composite waterproof layer. to enhance water resistance.

When taking a bath in the bathroom, water will splash onto the adjacent wall. Without the protection of a waterproof layer, the next door wall and the opposite corner wall are prone to moisture and mildew. Therefore, the wall must be waterproofed before laying the wall tiles. Generally, in waterproofing treatment, the wall needs to be waterproofed to a height of 30 centimeters, but for non-load-bearing light walls, the entire wall must be waterproofed, and it must be at least 1.8 meters high. The waterproof wall adjacent to the shower should also be 1.8 meters high. If a bathtub is used, the height of the waterproof coating on the wall adjacent to the bathtub should also be higher than the upper edge of the bathtub.

When pipes, floor drains, etc. pass through the floor during the construction process, the waterproof layer around the holes must be carefully constructed. Water pipes should be buried in the wall and laid out in a reasonable manner. When laying water pipes, make grooves that are larger than the pipe diameter. The grooves should be plastered smoothly, and then the grooves should be painted with polyurethane waterproof coating. Penetration of mortar layer.

I hope Jingmen Jicheng Decoration Niuniu’s sharing can help you

Question 3: How to waterproof the interior wall? The bathroom and kitchen at home are more likely to be exposed to water, so waterproofing projects are very necessary. Let’s talk about how to waterproof interior walls and bathroom walls!

1. Construction of interior wall waterproofing: 1. Waterproofing on walls and floors should be carried out at the same time;

2. Waterproofing should be done separately and painted with cement-based waterproofing materials . When laying ceramic tiles, adding it to the cement will have a very poor waterproofing effect, and this practice is also irregular.

3. If the wall is not waterproofed, it may cause the wall to get damp, causing the latex paint on the opposite wall to become moldy or even fall off.

2. Bathroom waterproofing construction: For bathroom waterproofing, the surrounding walls need to be painted at a height of no less than 30 centimeters; if there is a shower, the shower faucet must be installed on the adjacent wall. , the height of waterproof coating should not be less than 150 cm, preferably around 180 cm.

After the waterproofing is completed, a closed water test should be done. That is to put water on the floor of the bathroom, so that the ground is completely submerged in the water by about 3~4 cm, and set a fixed elevation (horizontal plane); check after 24 hours, if the horizontal plane is below the set elevation, it means that the ground There is a water seepage problem, that is, waterproofing is not done well. In this case, waterproofing will need to be done again.

After the bathroom waterproof coating is painted, tiles will be laid on it, so cement-based waterproof materials should be used for coating. The advantage of cement-based waterproofing material is that it can be bonded to the cement base layer. It has good adhesion and will not peel off after the ceramic tiles are applied. Other (non-cement-based) waterproofing materials are prone to shelling, which can cause wall tiles to fall off. , I will share with you the waterproof construction of bathrooms and interior walls here. It is recommended to find a professional master to do the construction to ensure the effect of the construction.

Question 4: How to make the wall waterproof and moisture-proof? If the wall is waterproof and moisture-proof, you can use cement-based penetrating crystalline waterproof coating. This waterproof material uses high permeability to fully combine the material with the cement-based surface to achieve waterproofing. Moisture-proof, acid and alkali resistant.

Question 5: How to waterproof the interior walls of your home. Hello, this problem can only be solved by waterproofing the exterior walls. If only the interior wall is waterproofed, if the wall gets damp after rain, the latex paint wall will still become moldy or even crusty - it will not have the desired effect. Friends upstairs said that it is inappropriate to use 911 waterproofing agent to waterproof indoor walls, because after using this waterproofing agent, wall putty cannot be applied, and even if it is applied, it will not be firm.

The only way is to waterproof the exterior wall. Even if it can only last for 2 to 3 years, you still have to do this, there is no other way. There is now a new type of silicone exterior wall waterproofing agent that you can use. We have also done this when decorating other people's villas, and the effect is still good.

Question 6: How to make waterproofing and leak-proofing products for exterior walls

Waterproofing and leak-proofing for civil air defense projects

Basement waterproofing and leak-proofing

Mines Waterproofing and plugging

Water seepage in external walls is a common phenomenon in construction and installation projects, which seriously affects the indoor living environment. At the same time, the presence of water also brings hidden dangers to the safe use of the structure. I see water in external walls during construction and installation projects. Common phenomena in engineering, combined with work practice, make the following analysis and discussion on the causes and prevention methods of external wall leakage:

1. Analysis of several types and causes of external wall leakage

l. The deformation of brick masonry and concrete components is not coordinated. Since the linear 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. The alternation between winter and summer will cause Temperature stress cracks will appear, causing leakage. The areas prone to temperature cracks are mainly the window walls, gables and parapet roots of the top bays of longer buildings.

2. Uneven settlement of the foundation, temperature deformation, wet and dry deformation causing cracking and leakage

When the temperature changes, the components will deform. When the deformation is restrained, temperature stress will be generated. The temperature stress is greater than the tensile strength of the wall. Strength will cause cracks and leakage. Winters in northern areas are cold, and frost heaving and cracking can easily occur when overwintering insulation measures are unreasonable. Generally, cracks occur at the bottom layer of strip foundations and under windows.

3. Gaps in exterior lightweight wall masonry cause leakage

The temperature expansion coefficient of exterior wall lightweight bricks, which serve as a filling rather than a load-bearing function, is larger than that of clay bricks. Therefore, after the alternation of winter and summer or under strong sunlight, they suddenly When the temperature changes due to rain, cracks will inevitably appear between the lightweight bricks and the concrete frame beams and columns. At the same time, the lightweight bricks themselves also have factors that are detrimental to waterproofing such as large shrinkage and deformation, large water absorption, low surface strength, and easy powdering.

4． Leakage caused by poor exterior wall decoration construction

The exterior wall plastering grid joints are not circular or straight, or the mortar residue is not cleaned, causing rainwater to accumulate in the grid joints, and the grid strips are embedded too deep. The thickness of the plastering at the bottom of the partitions is not enough, allowing rainwater to seep into the wall; the holes and gaps in the wall are not carefully blocked before the bricks are adhered to the exterior wall; the joints between the facing bricks are not careful or the mortar grade is low to form capillary pores, which are exposed under the action of wind pressure There is leakage underneath.

5． Leakage caused by loose sealing around door and window openings

At present, most doors and windows in buildings are made of aluminum alloy, plastic steel, and white steel. Due to temperature changes, cracks occur between their interfaces. Due to the lack of sealing materials or Leakage is caused by lax sealing and poor quality sealing materials.

6. Improper detailed structure causes leakage

Among the many components of the exterior wall, leakage can easily occur, such as overhangs, awnings, balconies and decorative lines protruding from the wall. These components

If the drip line is not made or is not made to a standard, water will flow along the exterior wall; in addition, during the construction of the body building masonry, the lead wire holes and scaffolding holes for fixing the scaffolding are not tightly blocked, and the mortar of various masonry structures is full. If the requirements are not met or the gray seams are not full, it is easy to leave water seepage channels.

2. Prevention and Control Measures for Exterior Wall Leakage

By analyzing the various types and causes of external wall leakage and preventing and treating these problems, good results will be achieved. Effect.

1. Effectively control 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 occurrence of cracks due to the influence of external natural conditions. In addition, there are door and window openings, feet For these weak links that are prone to leakage, such as hand and eye penetration walls, pipe roots, etc., management should be strengthened during construction and quality should be strictly controlled to nip problems in the bud.

2. Improve the construction technology and improve the anti-seepage ability of the exterior wall

If the wall lattice joints are prone to leakage, we can use glass strips, disposable plastic lattice strips, etc. instead. The exterior wall facing bricks Continue to use polymer cement mortar to reduce the brittleness of the cement mortar; if the exterior wall leveling layer encounters different materials, metal fields can be added to resist cracking caused by the different linear expansion coefficients of different materials; the sand used for plastering must be strictly controlled Mud content, eliminate the use of wind sand, etc.; and fully understand the importance of detailed structure to minimize wall leakage.

The causes of foreign debt leakage are very complex, involving all aspects of the building from design, construction to use. They are both unique and have regional characteristics, which seriously affect the lives and work of users and the construction industry. It has developed smoothly, so I propose to discuss with colleagues to jointly control the water seepage on the exterior wall.

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Question 7: Solution~~How to waterproof the wall when it is wet for a long time? This problem must be re-waterproofed upstairs. Only in this way can these problems be solved side by side. Others basically treat the symptoms rather than the root cause.

Question 8: How to make indoor waterproofing? In home decoration waterproofing, we generally need to do waterproofing and moisture-proofing for kitchens, bathrooms, and balconies. If your home is on the ground floor, all floors and walls less than 1.5 meters away from the wall need to be waterproofed and moisture-proof.

The waterproof parts in home decoration are generally small in area and have many pipes. Due to the limited width of polypropylene, it is not easy to cut and paste, and the technical requirements for workers during construction are relatively high. It also has a certain pungent smell. Sexual odor is not environmentally friendly when used indoors, so it is not recommended to be used in home decoration waterproofing.

For example, for waterproofing in home decoration, it is recommended to use kitchen and bathroom waterproof slurry for kitchen and bathroom. For balconies, roofs, etc., it is recommended to use K11 waterproof slurry in combination with flexible mortar waterproofing agent. This will not only make the construction easier and more convenient, but also The waterproof effect and environmental performance are also better.

Question 9: How to waterproof the exterior wall. In fact, this requires corresponding treatment of the waterproof parts according to the actual conditions on site.

Generally speaking, the original exterior wall paint on the base layer must be cleaned first, especially the broken and loose parts of the base layer must be thoroughly cleaned to expose the hard foundation. Clean the paint, dust, oil stains and stains on the surface of the waterproof base layer to ensure that the waterproof material is firmly bonded; then dilute the waterproof paint with water in a ratio of 1:2, and mix it with high-grade cement to make a plaster. Detailed treatment will be carried out on sand holes, honeycombs, and cracks; important parts such as around the windows, eaves bottoms, embedded parts, and wall pipes will be strengthened.

After the base layer to be repaired is dried, use special waterproof paint for exterior walls to paint the engineering parts according to standards; during mechanical spraying, the spray should be even and the stubble should be pressed in place without leakage to make the surface smooth. ; After the construction is completed, the site will be cleaned up.

Precautions for the use of exterior wall waterproofing materials:

1. Do not construct below 5℃ or in the rain, and do not construct in a humid or unventilated environment, as this will affect the results. membrane.

2. After construction, all parts of the project should be carefully inspected, especially weak links, which should be checked and repaired in time.