Level those uneven walls.
Tiling onto uneven walls.
Seal the walls with a skim coat and let it dry thoroughly.
How to prepare an uneven wall or floor for tiling plastering.
For an uneven concrete floor a floor leveller will solve all your problems.
Back buttering is a trick used for tiles of uneven thickness like ungauged slate or handmade tiles extremely large tiles or for tiles being installed on an uneven surface.
Things you will need measuring tape tile wet saw leveling spacers and wedges trowel thinset mortar rubber mallet grout grout float grout sponge.
Use a flat scrap of wood to even and smoothen out the surface and let this dry for a few hours or overnight.
If you put a 48 straight edge up against the most sunken areas there s a gap of almost a 1 2.
You want the tile adhesive to have something to grab onto.
Sand with a medium grit sandpaper to create a uniform surface that s not too smooth.
The mortar is spread.
First chip the bumps cracks and dents on the concrete wall with a hammer.
Then flush and fill the areas with cement.
Plastering the walls is the best way to ensure that the walls are nice and even.
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.
The problem is that the wall is uneven.