Tiling a Bathroom Wall: What the Instructions Don't Tell You

Tap the entire wall surface with your knuckle and listen for hollow sounds — these indicate loose plaster that must be repaired or removed. Fill any cracks, sand down high spots, and ensure the surface is clean, flat, and dust-free. In shower areas, apply a waterproofing tanking membrane according to the product manufacturer's instructions and allow it to cure fully before proceeding.

Measure the wall width and mark the center point. Using a batten (a straight piece of lumber) temporarily nailed horizontally at tile height, dry-lay your tiles along the wall without adhesive. This reveals where cuts will fall. Aim to position cut tiles symmetrically at both sides, and ensure no cut tile is less than half a tile wide — sliver cuts look poor and are difficult to achieve neatly.

Choose a flexible, waterproof adhesive rated for wet wall applications. Mix to a smooth, lump-free consistency if using powder adhesive, or use ready-mixed product per the manufacturer's guidance. Apply to the wall using the flat edge of a notched trowel, then comb through with the notched edge at a consistent 45-degree angle. Work in manageable sections — roughly 1 square meter at a time — so the adhesive doesn't skin over before tiles are pressed in place.

Press each tile firmly onto the adhesive with a slight twisting motion, then give it a gentle tap with a rubber mallet to ensure full contact. Insert tile spacers at each corner as you go. Use your spirit level constantly — checking horizontal and vertical alignment after every two or three tiles prevents small errors from compounding across the wall. Remove any adhesive that squeezes into the joints immediately with a damp cloth.

This is one of the most frequently skipped steps. Grouting too early — before the adhesive has cured — can shift tiles and weaken the bond. Check the adhesive manufacturer's recommended cure time; for most products this is at least 24 hours, and longer in cold or humid conditions. Once cured, remove all tile spacers using a pointed tool.

Select a grout appropriate for your joint width — unsanded grout for joints under 3mm, sanded for wider joints. Mix or use as directed, then apply diagonally across the tile faces using a rubber grout float, pressing firmly into each joint. Work in sections and remove excess grout from tile faces with a damp sponge before it sets. Rinse the sponge frequently. Once the grout hazes over, polish the tiles with a dry cloth. For ongoing watertight maintenance, see our guide on keeping wet rooms watertight.

Allow grout to cure for the time specified on the packaging — typically 24 to 48 hours. Then apply a penetrating grout sealer using a small brush or applicator, working methodically along each joint. Wipe any sealer off tile faces immediately. Sealing prevents moisture and cleaning products from degrading the grout over time. Plan to reseal annually in high-use shower areas.