Do this prior to any tiling job.
Tiling walls that are not plumb.
Slide a 4 foot straightedge or level over the wall in all directions to check for plumb.
The horizontal line assures the 3 walls are level with each other and the grout joints will line up wall to wall.
If you re tiling directly onto the wall however leveling clips and wedges will force the edges of the.
Its logical to do one wall at a time but it doesn t work out that way.
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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.
Lippage can be eliminated on most walls by hanging new drywall or backerboard before tiling.