Fixing uneven bathroom walls before adding drywall or tile starts with identifying how much the surface deviates from plumb and flat and choosing the most stable corrective method.

Start by measuring the wall with a long straightedge or a six foot level to find high and low spots and mark them at eye level and near the floor. If the framing is out of plumb by less than three quarters of an inch over a six foot run, shim the studs to a straight line using tapered wood shims driven behind the drywall or beneath new furring strips; fasten shims with countersunk screws into the stud and then trim flush. For larger deviations remove the existing wall covering back to the studs and strike a new layout line with a chalk line guided by a plumb bob, then sister new studs or add blocking to bring framing into true; use construction adhesive plus three inch screws at staggered spacing for a secure connection. When the substrate is roughly straight but has minor hollows, install one layer of thicker drywall, such as five eighths inch moisture resistant board, applied perpendicular to the studs to bridge small imperfections and reduce telegraphing under tile. For tile areas use cement backer board screwed to the studs or furring with corrosion resistant screws and joint tape to create a flat, rigid surface for thinset mortar; leave a small gap at floors and use tile edge trim to conceal transitions. Always check plumbing and fixture clearances after straightening so vanity and toilet locations align, and allow any added framing or sheathing to dry and settle before finishing to prevent future movement.

Common mistakes start with relying solely on filler or compound to hide out of plumb walls which will crack or show through once tiled; instead correct framing or use thicker board where appropriate. Another issue is insufficient backing behind fixtures and cabinets which creates weak points when shims change stud position; add blocking at anticipated mount heights to provide solid anchor points. A third problem is failing to account for moisture in bathroom environments when choosing materials which leads to mold or delamination; select moisture resistant drywall or cement board and use appropriate vapor control and waterproofing membranes.

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