What are the causes of cracking of exterior wall insulation?

What are the factors that cause the aging of exterior wall insulation boards?

In recent years, the construction industry has attracted much public attention, especially in the area of building safety, in high-rise buildings, a very important point, how is the aging of the exterior wall formed? Let's talk to everyone.

Aging factors. 1.Climatic factors: such as natural climatic conditions such as sunshine, rain, high winds, etc.

2.Material quality: If the material used for the exterior wall insulation board is of poor quality, it is easy to age.

3.Improper installation: If the installation is not standardized or has not been constructed by professionals, it may cause damage to the insulation board.

4.Improper maintenance: If the exterior wall insulation board is not maintained regularly, it is more likely to make it age.

Remedy. 1.Replace the exterior wall insulation board: If the aging is severe, replacing the exterior wall insulation board is the most common solution.

2.Leak repair: For the external wall insulation board with local damage or cracks, it can be repaired and repaired to restore the original insulation effect.

3.Cleaning and maintenance: After professional cleaning and maintenance, the aging exterior wall insulation board can restore the luster and color of the surface and prolong the service life.

4.Installing a hard exterior wall protective layer: Covering the surface of the exterior wall insulation board with a layer of hard materials, such as ceramic tiles, glass curtain walls, etc., can increase the anti-aging ability of the exterior wall.

The main reasons are as follows:

1. The quality of materials used in external wall insulation systems such as insulation boards, adhesives, and anchors is unqualified.

2. The pasting area of the insulation board and the number of anchors do not meet the requirements of the specification; For heavier composite insulation boards, no brackets are added when it is not sufficient to support the weight of the insulation board by adhesive and anchor bolting.

3. The exterior wall masonry is not plastered with the base layer of the insulation layer, and the insulation board is directly pasted on the masonry, resulting in the hollowing of the insulation board.

4. Cracks at the joints of the insulation board, door and window covers, bay windows, canopies, platforms and yin and yang corners, and the roots of exposed pendants, and the bolt holes of the exterior wall formwork through the wall are not dense, causing wall leakage.

5. The plastering layer is not equipped with anti-cracking measures such as alkali-resistant glass fiber cloth according to the regulations.

How to repair the cracking of the insulation layer of the external wall: 1. Find the cause of the cracking. It is possible that the cracking is not caused by the insulation itself, such as uneven settlement.

At this time, don't repair the crack first, it will be repaired again. 2. Replacement of existing insulation materials and repair of cracks. Cracking often results in leakage channels.

The insulation layer is soaked in water, and the thermal insulation performance is reduced, such as the destruction of freeze-thawing. At this time, the insulation materials within the affected range should be replaced and reconstructed. Then, if the insulation layer and wall surface have cracked, it is necessary to use glue, grout (epoxy resin) and other methods to plug the gaps.

For the insulation material that has been loosened, reinforcement measures such as bolts should be added. After the replacement of the insulation material and the large surface material are often not bonded, encrypted reinforcement measures should be taken. 3. Surface treatment.

Construction surface layer. Generally, it is to hang barbed wire, or glass fiber cloth and other reinforcing mesh, wipe anti-cracking mortar, and reconstruct the finishing layer.

There is too much moisture in it, and due to the influence of the weather (mainly heat), the evaporation of the water causes the insulation layer to bulge and resist cracking.

Causes of cracks in thermal insulation exterior walls

1. The oblique reinforcement net at the corner of the window and the reinforcement net at the corner of the yin and yang are leaked; The beginning of the system such as doors and windows is not set up in accordance with the regulations.

2. The curing time of the benzene board is insufficient, and the shrinkage is too large (it is required to be cured naturally for 42 days at room temperature or 60 days for constant temperature steaming for 5 days).

3. Failure to set up deformation joints according to regulations.

4. If the sundries in the joints are not cleaned or the protective film of the doors and windows is not removed, the sealing paste is injected; No silicone-based weather-resistant sealing paste is used.

5. The thickness of the surface layer of the glue is insufficient or too thick, and the alkali-resistant glass fiber mesh used is too hard, and the surface layer cracks caused by the rebound of the glass fiber mesh before the strength of the glue is scraped.

6. The fiberglass mesh of the post-repair and pasting of the benzene board is not overlapped with the original wall fiberglass mesh.

7. Finishing exterior wall coatings and external thermal insulation glues are not provided by the system supplier.

Solution:

1. Reinforcement nets must be set up at the yin and yang corners, the four corners of doors and windows, and decorative lines; Set up the white label at the beginning of the system according to the regulations.

2. Book the benzene board in advance to ensure the curing time of the benzene board.

3. Set joints at the junction of EPS board and different materials; Deformation joints shall be set up in accordance with regulations during design and construction.

4. Clean the base of the jointing part, remove the protective film of doors and windows in advance at the glue injection part, and use high-quality weatherproof and waterproof silicone-based sealing paste.

5. Use flexible alkali-resistant glass fiber mesh, the yin and yang corners are fixed with fixed cards to prevent rebound, ensure uniform thickness when scraping glue slurry, the thickness of the plastering layer is 3mm 1mm, and the glass fiber mesh is lapped according to the specified length.

6. Use double-row scaffolding, and no scaffolding eyes are allowed on the exterior wall.

The cement grade is too high, the cement is expired, the sand is too fine or the mud content is too high, the proportion of cement mortar is not right, and the putty is scraped before the cement layer is dry, and it will crack in the future.

2.The base layer of the original wall has not been cleaned, the putty has not been removed, and the original latex paint layer is separated from the new putty layer. As the saying goes: "Seven points of putty and three points of paint, good paint also needs good putty".

3.The previous layer of paint is not completely dry, and the next layer is brushed, and the outside is dry, but the inside is not dry; or the paint is applied too thickly at one time, resulting in low strength; Or not brushed.

Exterior wall insulation is a word often heard in recent years, but some of these problems have attracted everyone's attention, today we will analyze and summarize the four common causes of exterior wall insulation cracking. First, the problem of insulation materials, the density of insulation materials is not up to standard, and the time for maturation is not enough, it is easy to deform and cause cracking. Second, the problem of anchor bolt construction is not enough density per square meter to install anchor bolts, and when workers install anchor bolts, they use hammers to smash into them, resulting in uneven bulges on one side of the disc.

There are many reasons for the cracking of the thermal insulation exterior wall, first of all, it is because the quality of the insulation layer is not good, so because the quality is not good, it will lead to the fracture of the external wall, and there is another method, that is to say, because the temperature is unstable, it will also lead to this situation, then I think they should do some good activities in this case, so it is okay.

What is the cause of the crack in the insulation exterior wall, and this may be one? Material. caused. Maybe there's something wrong with this material.

Summary. The following are the treatment measures for cracks in exterior wall insulation panels:

1.Decoration Materials:

It is made of decorative materials with elasticity. At present, in the treatment of wall substrate, there is a kind of "elastic putty" that can make up for the problem of wall cracks to a certain extent.

2.Crack removal:

Remove the insulation board on the surface of the wall, or remove the cement wall, install a layer of gypsum board or "five-centimeter board" outside the insulation layer, and then make latex paint on it. This method can remove all the irregular cracks, and the cracks are generally the joints between the plates, which are easier to deal with. However, this method is expensive and difficult to construct.

3.Fiber Tension:

After the wall substrate is cleaned, a layer of good cloth, kraft paper or newspaper is pasted on the wall, and the tension of the fiber is used to ensure the integrity of the latex paint film. This method is relatively simple and easy, but the results are modest.

4.Remove the insulation:

Remove the insulation of the wall. Although this method can be done once and for all, it will reduce the thermal insulation and thermal insulation performance of the wall, so it is not recommended.

How to repair cracked exterior wall insulation.

Hello, looking for a maintenance person.

The following are the measures for the handling of cracks in the exterior wall insulation board:1Decorative materials to dress up potatoes:

It is made of decorative materials with elasticity. At present, in the treatment of wall substrate, there is a kind of "elastic putty" that can make up for the problem of wall cracks to a certain extent. 2.

Remove cracks: remove the insulation board on the surface of the wall, or remove the cement wall, install a layer of gypsum board or "five-centiboard" outside the insulation layer, and then make latex paint on it. This method can remove all the irregular cracks, and the cracks are generally rolled into the joints between the plates, which is easier to deal with.

However, this method is expensive and difficult to construct. 3.Fiber Tension:

After the wall substrate is cleaned, a layer of good cloth, kraft paper or newspaper is pasted on the wall, and the tension of the fiber is used to ensure the integrity of the latex paint film. This method is relatively simple and easy, but the results are modest. 4.

Remove the insulation: Remove the insulation layer of the wall. Although this method can be done once and for all, it will reduce the thermal insulation and thermal insulation performance of the wall, so it is not recommended.

First of all, the cracked insulation is removed, and then the board is not easily deformed.

Use a more flexible mortar, apply the insulation layer, and finally apply the exterior wall paint.

Not enough, and then there is a large amount of water intrusion insulation layer to overheat or overcool the insulation layer freeze cracking, in the selection of materials to choose a more flexible mortar, do not choose extruded board.

For thermal insulation, extruded plastic board is very easy to crack, and the construction process should be carried out in accordance with the standard construction process, and the mortar cannot be fully integrated due to cumbersome construction. 2. The cracking of the insulation layer will not only affect the effect of thermal insulation, but also affect the appearance, and if it is not treated for a long time, there will be water seepage and fall off, which will shorten the life of the building, and will also cause a large number of mildew to grow on the walls in the room. 3. To be reinforced at the cracked position, extend 15 to 30 cm along the cracking of the insulation layer to both sides until the cement or the base of the building is exposed, remove all impurities, let the gaps be completely exposed, and then repair by professional personnel, select more suitable insulation materials for filling, and then use waterproof and crack-proof water glue to coat the surface of the insulation layer after filling.

Why do walls crack? Answer: There are four reasons for wall cracking, one is **, the deformation of the wall during heavy rain, resulting in cracking.

Second, when building a house, the foundation and foundation are not strong, resulting in cracking. The third is to repair underground facilities, mining, and crustal changes lead to cracking. Fourth, other buildings, due to their own reasons of infringement, tree withering, wind blowing to smash, building houses on various uneven foundations, or although the foundation is uniform but the load difference is too large, when the stiffness of each part of the house structure is too large, it is easy to produce uneven settlement and produce cracks in the main structure.

The substrate has high humidity and large wind speed in the external environment; The base layer is loose and the base layer of the wall is cracked; Improper ratio of latex paint and water, or improper handling of the base line duct. Some of the wallpaper cracks are caused by the cracking of the foundation house, and some are cracks or warping joints caused by construction. The viscosity of the paint is high at one time, the temperature is too high, and the surface is dry without drying.

First, the plastering layer cracks and hollows; The second is the hollowing of the putty layer. The cracks or hollowing of the plastering layer and putty layer are mostly due to the poor quality of raw materials, the wrong ratio and the careless construction not according to the specifications of the developer in the construction of the building. Therefore, consumers must carefully check the quality of the wall when receiving the house, and once a problem is found, it must be done in a targeted manner when decorating.

After a long time, several spring and autumn, unrecognizable, had to be renovated again. This involves the matching of various coefficients of the material. There are also water viscosity issues, fluidity issues.

Some people make flooring, thinking that the material is of high quality will be satisfied, and it is necessary to know that the process design of the project is very demanding and strict. I've floored 10 times and only one is flawless. The temperature difference is the most common cause of wall cracks, because the general material will expand and contract, in the mixed structure, the expansion coefficient between different materials is not the same, when the temperature changes, the reinforced concrete roof, the floor, the ring beam and the adjacent brick wall expand and contract differently, forming a temperature difference, so that it is easy to make the house structure crack.

It should be solved by the developer, because the insulation wall is cracked, which is the quality problem of the house.

I think the best way is to find a renovation company to renovate, which can make up for it.

During the decoration, the insulation layer is removed, a layer of gypsum board is installed outside the insulation layer, and then the paint treatment is applied, which can effectively remove irregular cracks and play a protective role in the insulation layer. If the insulation layer at home is cracked, there is an "elastic putty" on the market that can solve the problem of cracking the insulation layer to a certain extent.

1.Lightweight partition wall is generally made of nylon mesh cloth or kraft paper, and the partition board itself is also prone to small cracks, so in order to minimize cracking in home decoration, it is best to paste a glass cloth or bean bag cloth, if it is a load-bearing wall or solid wall, the reason for cracking may be that the putty is too thick during construction or the interval is short, and the putty is not dry.

2.The old wall should be required to remove the original base putty and paint, some rooms used 821 putty for the original wall decoration, this putty is easy to powder, peeling, falling off, to shovel off, re-carry out the base treatment, and then paint.

3.Insulation board cracks Use a putty knife to cut the cracks, try to be as deep as possible, fill in gypsum, pay attention to be sure to fill in, fill evenly, and then use bandages and nylon mesh cloth to paste the cracks, and then scrape putty or do other processes after drying.

It is made of decorative materials with the filial piety of the hand. 2.Removal of fissures:

Irregular cracks can be removed completely. 3.Fiber Tension:

Utilizes the tension of the fibers. 4.Remove the insulation:

Remove the insulation of the wall, I hope the potato and mine will help you.