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