If a wall tile is uneven the mastic holding it in place was not spread properly.
Uneven tile wall.
In many cases when tile is installed by the thinset method over an uneven substrate the installed surface will not meet lippage standards.
To do so make sure all of the tiles are intact and secure.
Repair any loose or cracked tiles.
Remove the tile and prepare the wall according to the corresponding instructions above or tile over the existing tile.
The problem is that the wall is uneven.
Comb walls then back butter tiles accordingly if they are really bad holes etc you can build out wall in layers using rapidset adhesive which will set in 3hrs which will then allow you to use your tub stuff after priming make sure you smoothe the rapidset otherwise you are giving yourself more hassle.
Wash the wall with tsp tri sodium phosphate or an ammonia based cleaner to remove any grease or oil.
If you put a 48 straight edge up against the most sunken areas there s a gap of almost a 1 2.
For a paver tile commonly used on floors the allowable warpage is defined as follows.
Things you will need measuring tape tile wet saw leveling spacers and wedges trowel thinset mortar rubber mallet grout grout float grout sponge.
The ansi a137 1 standard defined allowed warpage according to the type of tile.
Quite often the reason for uneven tiles is an uneven layer of thinset mortar holding tiles on the floor.
There is also a spot near the window trim where the wall appears to be built up too much enough so that the tile could end up proud of the trim which i m pretty sure won t look so hot.