Start by dry-fitting the entire three-piece tub and shower surround to confirm panel alignment and clearances before any adhesive or fasteners touch the walls.

Begin by turning off the water at the main and removing existing trim and old surround materials down to the studs. Measure the shower opening height and width at several points and compare to the surround kit dimensions, noting any out-of-plumb conditions; if walls are out of plumb more than one quarter inch over eight feet, plan to shim or use thin cement backer board to create a flat substrate. Clean and vacuum the tub flange and upper ledges thoroughly so adhesives bond to solid, dust-free surfaces, and allow the tub deck to fully dry. Follow the manufacturer sequence for panels since most three-piece systems require the center back panel first then side panels to interlock or overlap correctly; keep the instruction sheet visible and read through steps before applying adhesive. Mark and cut precise openings for plumbing fixtures using a sharp hole saw or oscillating tool and a template from the manufacturer to avoid oversized holes that compromise sealant coverage. When applying adhesive, use the recommended adhesive pattern and press panels firmly with even pressure, temporarily bracing tops if needed until the adhesive sets; use mildew-resistant sealant at all vertical seams and around fixtures, tooling the bead smooth and removing excess promptly.

The most common mistake is not allowing for out-of-plumb walls which forces panels to gap at the top; correct this by scribing and trimming the panel edges, or adding thin shims behind the panel flange so the face sits flat against the framing. Another frequent issue is cutting plumbing openings too large or in the wrong location which leads to poor sealant contact and leaks; prevent this by dry-fitting and using cardboard templates taken from the actual panel and measuring from fixed reference points like the tub overflow. A third problem is applying adhesive to a dusty or damp tub deck which prevents bond failure over time; always vacuum and wipe with solvent if recommended, then press panels firmly and clamp or brace until the adhesive cures.

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