Then address any unevenness of the studs with furring strips or shims.
How to tile a wall with an uneven ceiling.
The wedge will pull the tiles together and create a smooth straight installation evening out any bumps or jogs caused by the uneven wall.
I know my ceilings are off by at at least 1 2 inch from one side to the other 7 span.
Ditto on the staggering the 50 50 brick is not recommended for those sized tiles.
I would take out off the drywall if not from the whole wall then from the cabinets up take off the window trim casing and sill.
The tiles are natural stone with little individual different size tiles all are 3 4 high but then vary in width from 2 to 4 glued to a 12 mesh.
The mortar is spread.
I am tiling 2 walls in my bathroom.
The tiles will go from floor to ceiling.
The uneven ceiling issue is the story of my life in a 120 year old house.
Repeat the process for the rest of the installation and.
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.