The existing surface needs to show some sort of roughness that will facilitate the bonding between the new adhesive and the old surface.
Tile is level wall is not.
It is extremely important to level the surfaces.
Now going along the wall hold up a tile to the wall and mark on the tile where the line is.
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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.
If a wall tile is uneven the mastic holding it in place was not spread properly.
Now using a level make a line on your wall all the way around the area you ll be tiling.
Many walls are somewhat uneven.
If not it s time to get cutting those tiles.
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.
The horrible gap between this ceramic tile and the wall is not normal.
If not you can level the surface using a grinder sander or a tile level system.
Take the tiles to the tile saw and make all the cuts.
It s really important to start laying your field tiles so the faces are level.
Use a long straight batten levelled with a spirit level to find the lowest point.
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.
While doing this number your tiles as you go so you will know which tile goes where.
Fixing whole tiles to a wall.
Create a rough surface to improve bonding.
If it s straight you can use it to align your tiles instead.
How to tile an uneven wall.
If you re tiling over an uneven section of wall the.