If you re tiling directly onto the wall however leveling clips and wedges will force the edges of the.
Tiling walls that are not plumb.
Do this prior to any tiling job.
Lippage can be eliminated on most walls by hanging new drywall or backerboard before tiling.
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Slide a 4 foot straightedge or level over the wall in all directions to check for plumb.
Check the wall first to see if it is straight.
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.
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.