01 External wall insulation layer falls off

Due to quality problems of the materials used and carelessness during the construction process. External wall insulation panels are prone to displacement, hollowing, and falling off. The slurry insulation layer has hollowing and falling off. If not handled in time, the insulation effect of the wall will be greatly reduced.
Reasons:
1. Base structure factors
The insulation layer of the frame structure is prone to damage due to masonry deformation at the joints between concrete beams and masonry. The scaffolding openings are not solid. The insulation layer is damaged due to local loose base. The external wall decorative components are not fixed firmly and shifted, forming a push-pull effect. The insulation layer is partially hollowed and cracked, and then water seeps for a long time. Eventually, the insulation layer falls off.
2. Improper anti-pressure measures.
The surface load of the insulation board is too large, or the negative wind pressure resistance measures are unreasonable. For example, the external walls of coastal areas or high-rise buildings use a non-nail-bonded bonding method. It is very easy for the insulation board to be damaged by wind pressure and hollow.
3. Improper wall interface treatment.
Except for clay brick walls, other walls should be treated with interface mortar before applying slurry insulation materials. Otherwise, it is easy to cause direct hollowing of the insulation layer or failure of the interface treatment material. Form hollowing of the interface layer and the main wall. The insulation layer is also hollowed. The surface of the insulation board also needs to be treated with interface mortar. Otherwise, it will also cause local hollowing of the insulation layer.

02 Cracking of the plastering layer

The external wall insulation plastering layer consists of plastering mortar and reinforcement mesh. Plastering mortar is divided into base mortar and surface mortar. It is understood that when the plastering layer is constructed. First, apply the base mortar to the surface of the installed external insulation board and add the reinforcement mesh. Apply the reinforcement mesh shallowly into the base mortar. Then apply the surface mortar on it. The thickness shall not be less than 3 mm, and the pattern must be exposed without the mesh.
Plastering mortar is also called anti-cracking mortar or anti-cracking mortar. It plays a key role in the entire external insulation system. Build a reliable reinforced protective layer for the external insulation board. The cracked plastering layer cannot solve the problems of external insulation, such as insulation, wind pressure resistance, fire resistance, freeze-thaw resistance, waterproof, weather resistance, flame retardant, breathable, and cracking.

03 Indoor condensation

Because there are too many decorative lines picked out with concrete on the inner wall. The concrete pouring ratio has been determined when doing insulation. The insulation treatment of this part is abandoned. These exposed concrete parts that have not been treated with insulation will cause frost and condensation in the room. It is easy to cause the wall to be damp and moldy.

Reason:

1. The node design of the window is unreasonable.
In energy-saving design, there is only one principle for the design position of the window, that is, different positions are set according to different insulation forms. When using external insulation, it should be close to the outside of the wall. Try to connect the insulation layer and the window into a whole to reduce the insulation breakpoint between the insulation layer and the window body and avoid the occurrence of thermal bridges. Some designers ignore the influence of heat transfer of the outer window bladder on the heat consumption index in the design. The window bladder around the outer window opening is not treated with insulation design. This leads to indoor condensation.
2. Formation of cold and hot bridges.
The unreasonable design of insulation breakpoints leads to the formation of thermal bridge effects around window openings. The indoor humidity dead corners should be improved. Good ventilation conditions should be maintained. Fundamentally block thermal bridges.
3. Unreasonable waterproof design.
The dripping treatment at the upper mouth of the root was not taken into account in the design of the window. And the waterproof design treatment at the root of the lower mouth of the window. Water can easily enter the interior of the insulation system from the connection between the insulation layer and the window root. Thereby causing harm to the external insulation system.
04 External wall tiles are hollow and fall off. News of injuries caused by the falling of external wall tiles and materials is common. Quality problems caused by mistakes in construction and the influence of temperature may be one of the factors causing problems with external wall tiles. In addition to making the wall look ugly, hollow and falling tiles are also prone to accidents.

Reasons:

1. Temperature changes. The temperature difference between different seasons and day and night makes the facing tiles affected by temperature stress in three-dimensional directions. The facing layer will produce local stress concentrated at the junction of the vertical and horizontal walls or the roof and the wall. If it is in the middle of a large area of ​​wall, or local extrusion of adjacent tiles, it will cause the tiles to fall off.
2. Material quality. Because the mortar layer is deformed and hollowed, the tiles fall off in a large area. The composite wall is incompatible with the materials of each layer and deforms uncoordinatedly. This causes the tiles to move. The waterproofing measures for the exterior wall are not in place. This causes water to penetrate, causing repeated freeze-thaw cycles. This causes the bonding layer of the tiles to be damaged, causing the tiles to fall off.
3. External force factors. Some external factors can also cause the tiles to fall off. For example, uneven settlement of the foundation causes deformation and dislocation of the walls of the structure. This causes serious cracking of the wall and the falling of tiles. Natural factors such as wind pressure and earthquakes can also cause the tiles to fall off.