Either the wall itself has sagged slightly over time or the surface of the wall is not completely flat.
Tiling uneven wall surface.
Back buttering is a trick used for tiles of uneven thickness like ungauged slate or handmade tiles.
When working on an uneven floor a floor levelling compound is a simple and effective.
If that looks good to you then just accent with some color décor items in maybe a red.
Level those uneven walls.
Scrape the wall to remove any texture and to create a flat surface.
Patch any holes or cracks with spackling compound and sand the entire surface with medium grit sandpaper.
The larger the tile size the flatter the wall needs to be.
A flat surface is one of the primary requirements for tiling.
When using smaller tiles wall defects will be less pronounced as the tiles will follow your uneven wall better.
How to prepare an uneven wall or floor for tiling plastering.
Tile laying tricks for uneven surfaces floor leveling compound.
Haimg apr 19 17 at 20 16.
1 4 won t fly no matter the size of the tile even if you used 3 8 mosaics.
Tiling uneven walls walls tend to be uneven for two main reasons.
Remove any remaining dust oils and grease from the wall with tsp tri sodium phosphate or an ammonia based cleanser.
For an uneven concrete floor a floor leveller will solve all your problems.
If you re tiling over an uneven section of wall the corners of the tiles may stick out slightly from the rest of the tiles.
Plastering the walls is the best way to ensure that the walls are nice and even.
If the substrate the floor tiles are being installed on is uneven but structurally sound a.
Preparing an uneven floor surface a floor levelling compound.
A light or medium grey as close to the tile colors as possible and maybe with a hint of blue.
Do the light gray white on the ceiling and the darker gray on the walls.
If you usually stand in front of this wall you won t notice as much curvature as if the wall was to your side.
It also depends on your line of sight e g.
Vacuum to remove dust.
This is known as lippage and it can diminish the most professional of.
I think it s the wall and ceiling colors.
Either way the best course of action is to remove the boards then re board and re skim the walls so that you have a a flat surface to work from.