1 Â Wall putty layer is not cleaned
There is a layer of putty on the wall of the rough room, which needs to be cleaned when laying tiles, and cleaned with steel wire. If it is not cleaned, the cement mortar and the wall are not firmly bonded, and there will be a hollow. Even if the ceramic tile and cement mortar are bonded well, they will fall off!
2 The ratio of cement sand is wrong
Generally, the wall tiles are 1 to 2.5, that is, 1 part cement, 2.5 parts sand, and then mixed and pasted. In many cases, there is no accurate control, and 1: 4 and 1: 6 are pasted, which is very unreliable. At that time it seemed to be stuck, but it will easily fall off after a long time, and there is no problem with the quality of the tiles!
Source: Home Improvement New Perspective
3 There is no soaking before paving the wall tiles
Many wall tiles are ceramic tiles, and the water absorption rate of the tiles is greater than 10%. If they are not immersed before paving, the moisture in the mud will be sucked away, causing hollowing and cracking, or even shedding!
4 The water absorption rate of the tile fails
The water absorption rate is too high, the density of the tile blank is relatively loose, and it is easy to absorb water. After the tile is thermally expanded and contracted, it will cause the surface to crack, and even the whole tile will peel off.
The wall tiles with too low water absorption rate can hardly absorb the water in the cement mortar, and the bonding force cannot be formed between the tile and the cement, and the chance of falling off will also be greatly increased.
5 grassroots plastering is not done
The wall and ground base must be cleaned to remove all kinds of dirt on the wall.
If the base layer plaster is not cleaned, the moisture of the cement mortar will be absorbed by the dust and other deposits at the base layer, and the bonding quality will be affected, which will eventually lead to hollowing or falling off.
6 Â The foundation is not watered
The wall foundation was not sufficiently wetted before being laid, which caused the water in the cement mortar and brick body to be sucked away. The mortar did not have enough humidity during the setting time to fully bond the tiles.
Wet the base layer with water the day before laying, and control the humidity at 30-70%.
7 Insufficient gaps in tiles
Ceramic tiles are ceramic products made of natural clay and will expand and contract with the change of temperature. The tiles do not leave seams, the tiles will squeeze and fall off each other, generally leave 1 ~ 2mm seams, just like the concrete road must cut the seams. In many cases, the level of the master in the construction process is not good and the construction period is rushed, which leads to uneven retention, 2mm in some places, and 0.5mm in some places. Therefore, paving bricks is very important. You need to be cautious when looking for a master. You need to find a master with good craftsmanship and good reputation!
8 Improper selection of cement label
The grade of cement mortar indirectly affects its setting effect with ceramic tiles.
If the label is not enough, the viscosity is not good, but the cement label is too high. Once the hydration is fast and the water evaporates quickly, and the ambient temperature difference is too large, cracks are likely to occur. Poor adhesion can easily cause the tiles to loosen or even fall off .
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