Its logical to do one wall at a time but it doesn t work out that way.
Tiling walls that are not plumb.
Answer answer what should have been done while installing the hardibacker board on the walls is the framing studs should have been shimmed and adjusted to make sure the hardibacker board was plumb and square.
If the walls were not too far out of wack you can use the thin set mortar or there are special patching mortars for going over the hardibacker board as long as it isn t applied too thick.
Slide a 4 foot straightedge or level over the wall in all directions to check for plumb.
Lippage can be eliminated on most walls by hanging new drywall or backerboard before tiling.
Check the wall first to see if it is straight.
If you re tiling directly onto the wall however leveling clips and wedges will force the edges of the.
The horizontal line assures the 3 walls are level with each other and the grout joints will line up wall to wall.