Is hollowing out of facades common? What are the harms of hollow walls?

Hollowing of exterior wall tiles is a relatively common problem, usually the adhesion of the base mortar is not good, or there is a problem with the surface tile inlay.

Tile hollow drum not only affects the use of the effect, but also affects our daily life, tile hollow drum to re-paste is also very troublesome, so in the tile is also to take corresponding precautions to prevent tile quality problems.

For example: the coating of cement slurry should be uniform, the painting time should not be too long, to avoid the separation of the surface layer and the base layer, mix the mortar in strict accordance with the ratio, can not add water arbitrarily, the mortar should be dry and hard, and the general thickness is controlled at 2-3 centimeters.

When paving the floor tiles, the floating dust on the back should be cleaned up, watered and moistened, and the bonding should be ensured.

In order to avoid the occurrence of this kind of thing, in addition to doing a good job in tile construction, at the same time, the tile should pay attention to maintenance after pasting, so as to deal with the dirt on the surface of the tile in time, and try not to press the tile surface with heavy objects.

1. The reason is that the wall of the blank room is hollow.

During the construction process, due to the low structure and adhesion in the wall powder layer, the wall surface is hollowed out and cracked, which is often called "sand gray wall".

2. The grassroots treatment is not clean.

In the construction process, the brushing and maintenance are insufficient or not watered and moistened in advance, so that the plastering loses too much water, and the surface causes the base and the plastering layer to not stick firmly, resulting in hollowing.

The hollow drum is caused by the presence of air in the original masonry and the powder layer, and when detecting, the plastering layer and the screed layer are knocked with a hollow drum hammer or a hard object to make a knocking sound for the hollow drum. in the quality of the house"Hollow drums"Generally, it refers to the hollowing phenomenon between the ground, wall, ceiling decoration layer (plastering or pasting surface bricks) and the structural layer (concrete or brick wall) of the house due to the unstable pasting and combination, commonly known as it"Two layers of skin"。

Dangers of hollow drums:

1. Hazards of wall hollowing:The wall surface of the wall tiles will appear, and the wall tiles will crack and fall off.

2. Ground hollowing hazards:Where the floor tiles are laid, the floor tiles will fall off after a long time.

How to deal with hollow drums:

1. Grassroots processing requirements:

a. The dirt on the surface of the base layer must be cleaned. Steel wire mesh must be used at the intersection of different base materials, and the lap length of each side is not less than 100mm.

b. Before plastering, the uneven wall must be shaved and smoothed, and the holes or depressions must be watered with 1:3 cement mortar, moistened, blocked, and smoothed in layers.

c. When the base layer is too slippery, it should be chiseled or brushed with an interface agent.

d. For lightweight partition walls, such as GRC boards, aerated concrete slats, gypsum perlite air slats, various blocks (lightweight hollow blocks), etc., a steel wire mesh sheet must be laid, and then cement mortar must be powdered.

2. The base wall should be watered in advance, and it should be watered thoroughly and evenly.

3. The exterior wall must be divided into lattice strips in accordance with the design requirements.

4. The mortar used for plastering must have good workability.

5. Cement mortar, mixed mortar, and lime mortar cannot be covered or mixed before and after.

Solution: 1. The common way to repair the hollow drum is to shovel the sand ash, refill it with quick ash, and re-batch the putty after drying.

2. Some hollow drums are difficult to chisel out due to their location and other reasons. This type of hollowing can be solved by the method of perfusion repair.

3. The AB resin grouting repair of some engineering crack treatment centers can inject high-strength adhesive into the hollow drum, and the empty position can be filled with full, and the adhesion and compressive resistance can meet the requirements of use.

When the wall is hollow, don't pick it hard, this will cause more damage to the wall, and you should stay away from this wall to avoid unnecessary damage to yourself. There are many reasons for hollowing, because in the wall paint construction of house decoration, wall putty should be draped on the wall, and the wall paint can be applied only after polishing, and most of the wall putty generally used now is the so-called environmental protection putty powder (the putty powder has been mixed with glue in the factory production), this type of environmentally friendly putty powder is used after mixing water when used, and the wall paint is also mixed with water to roll the construction, when the "sand gray wall" encounters the infiltration of these waters, the water is sucked into the wall, and the water is contained in the wall. It is difficult to volatilize it for a while, when the house is renovated, with the change of time, when the outside temperature rises, the moisture in the wall expands outward, due to the loose structure and poor adhesion of the "sand gray wall" itself, the expansion of the moisture in the wall leads to the expansion of the wall, and finally forms a large area of hollowing and cracking on the wall after decoration, which brings troubles to the life of the majority of owners' families.

Regarding the hazards of wall hollowing, the civet cat house inspection supervisor summarized these points:

1.Affect the aesthetics. If there is a hollowing phenomenon in the wall, which is not found in the later construction, cracks may occur after brushing the paint.

2.Safety hazards. After a period of time, the surface of the wall will protrude outward, and cracks will appear at the lightest, and the wall skin will fall off at the worst; If it is tiled, the hollow wall can not hang the tiles, and over time, it will cause the tiles to fall off, cause the consequences of smashing the floor tiles and furniture, and even, cause certain hidden dangers to our personal safety.

3.The decorative effect is affected. If hollowing and cracks occur in places where the window sill and balcony are in direct contact with the external interface, the cracking will inevitably cause water seepage, which will not only reduce the protective effect of the wall, but also affect the decorative effect.

Of course, so the problem of house acceptance and hollowing cannot be underestimated:

1.Observe with the naked eye: the hollow drum is generally slightly higher than the surrounding overall plane, and is often accompanied by cracks, and you can find that the inside is empty when you press it with your fingers.

2.If the sound of "knock knock" is made, it means that there is a hollow drum inside, and if it is a load-bearing wall, there is a serious quality problem in the house.

The hollow wall is easy to peel off the wall paint or other paints that are brushed up in the future! Therefore, before brushing the wall, the hollow drum must be dealt with, and the wall skin can be removed before construction!

This situation is generally the hollowing phenomenon of the stucco layer is not firmly bonded, and if the diameter of the hollow drum is within 30 cm, it can be ignored. If it is more than 30 cm in diameter, it should be removed and repainted.

The hollow drum on the wall is basically a hollow drum of the plastering layer, and the hollow drum of the screed layer will quickly crack and fall off. The plastering layer is a layer of cement mortar close to 2 cm, which is very strong and will not crack off easily, if it is not a large area, there is no problem. The screed (putty) hollow drum does not need to be left alone, if there is cracking, falling off, do part of the eradication and maintenance.

If there is a large area of hollow drum, it will cause the wall to crack, easy to fall off, and affect the appearance of the room.

If it is a wall that is plastered with white plaster and ready to be painted, it is easy to crack and fall off, if it is a tile, there is generally no problem, just don't punch holes in empty places, if you don't play well, empty places will crack.

After scraping putty on the wall to make latex paint, there will be cracking of the wall, which can fall off in serious cases, and the minimum is unsightly. Beautiful new houses that have spent tens of thousands or hundreds of thousands of dollars to renovate are cracked everywhere, and the effect can be imagined.

The wall surface of the wall tiles will appear, and the wall tiles will crack and fall off. Very aesthetically pleasing tile walls, with cracks and uneven peeling.

Cause. 1. The base layer is not cleaned before plastering, and the walls of different materials are not connected with the steel wire mesh in accordance with the specifications; The wall is not watered thoroughly; The exterior wall is painted with no grid or too large a grid.

2. The quality of raw materials does not meet the requirements (the sand particles are too fine, the mud content is large, and the stability of the cement does not meet the requirements); The mortar is not stirred evenly.

3. The concave and convex deviation of the base layer is large, the plastering is too thick at one time, there is no layered plastering or the time interval between each plastering is too close; When the total thickness of the plastering is greater than 35mm, no strengthening measures are taken.

4. The difference in the mix ratio of each layer of plastering layer is too large, and the cement mortar with a higher strength grade is painted on the surface layer or lime mortar surface layer with a lower strength grade.

5. When the temperature is too high, the mortar loses water too quickly; After plastering, it is not properly watered and cured.