The reason why there is no cement bulge on the back of floor tile.

The main reasons for floor tiles sticking to bricks and arching without cement are as follows.

Tile bottom embryo problem

There is too much dust or greasy in the ceramic tile bottom blank, which leads to low bonding strength with cement mortar.

Dry ash layer problem

The proportion of cement sand in the dry ash layer under the floor tile is improper, and the sand content is large, which causes it to absorb the moisture in the cement mortar on the back of the brick too quickly.

Grass-roots problems

When laying dry ash layer, the base is too dry, and the moisture in the mortar is absorbed too fast, which leads to the delamination of ceramic tiles.