Level those uneven walls plastering the walls is the best way to ensure that the walls are nice and even and ready for you to tile on.
How to level a wall for tile.
If you plan to cut the bottom row of tile start your installation with the second row.
How to tile an uneven wall.
Slide a 4 foot straightedge or level over the wall in all directions to check for plumb.
It can be worth getting a professional plasterer in to complete the task as plastering is a difficult skill to master and plastering a perfectly flat even surface is not for beginners.
For the vertical layout begin your pattern at the top of the wall so there ll be full uncut tile at the top.
So let s look at the basics of wall tile installation that will make everything go a lot smoother less frustrating and less costly.
After all the penalty for poorly installed wall tile is a lifetime of having to look at the stuff.
Check the wall first to see if it is straight.
Leveling wall for tile.
That way if you do have to cut tile to fit they ll be at the bottom where the tub or shower pan might be slightly out of level.
They may have settled or bowed over time or the plaster may be rough and uneven.
When i replace a backsplash i almost always cut the old one out substrate and all.
Takes no time at all i come up an inch from the countertops and an inch down from the upper cabs cut out with the fein tool replace with whatever backerboard you choose and you have a new flat surface for the new tile.
Do this prior to any tiling job.