There are numerous ways to make a bumpy uneven or unlevel surface ready for tiling.
Tiling with unlevel walls.
Back buttering is a common solution to tiling uneven walls and floors or using tiles of varying thicknesses.
Things you will need measuring tape tile wet saw leveling spacers and wedges trowel thinset mortar rubber mallet grout grout float grout sponge.
The area of the wall to be tiled minus the area of the window is 37 square feet.
I explain why this method works soooo easy.
The mortar is spread.
Short answer to how to prepare an uneven wall or floor for tiling.
It simply involves applying mortar as normal to the substrate but then also applying mortar to the back of the tiles.
Believe it or not there are more uneven walls and floors than there are even ones.
Here is an easy way to set your 1st row and the rest going up your wall then lastly the first row is set.
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.
Plastering backer boards and self levelling compound are all great options.