Create a rough surface to improve bonding.
Tile is level wall is not.
Use a long straight batten levelled with a spirit level to find the lowest point.
If it s straight you can use it to align your tiles instead.
Many walls are somewhat uneven.
If not it s time to get cutting those tiles.
How to tile an uneven wall.
Now going along the wall hold up a tile to the wall and mark on the tile where the line is.
To repair uneven tiles you need to remove the tiles and repair their base.
Take the tiles to the tile saw and make all the cuts.
Now using a level make a line on your wall all the way around the area you ll be tiling.
The other alternative is to run the wall tile doewn behind the floor tile with a 90 degree corner there.
Once you reset the tiles you need to.
The horrible gap between this ceramic tile and the wall is not normal.
The way i would approach this would be to get your top row correct and level then work down to the floor.
They may have settled or bowed over time or the plaster may be rough and uneven.
If you re tiling over an uneven section of wall the.
While doing this number your tiles as you go so you will know which tile goes where.
Fixing whole tiles to a wall.
That way any warping of the tile out of level occurs lower on the wall where it is not so obvious as at the top.
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If not you can level the surface using a grinder sander or a tile level system.
If a wall tile is uneven the mastic holding it in place was not spread properly.
The back of the tile should be flush with the wall.
It is extremely important to level the surfaces.