How to Tile Shower Walls

Tiling is the architectural armor of your bathroom. When done well, it forms a monolithic barrier that channels water directly into the drain rather than into your wall studs. The secret isn't in the speed of your trowel work, but in the brutal, unflinching preparation of the substrate before a single tile touches the wall. Achieving a professional finish requires patience and a strict adherence to layout. You are looking for clean lines, centered cuts in the corners, and a perfectly level starting point. If the foundation is flat and waterproof, the tiling will be simple. If the substrate is wavy or damp, no amount of expensive tile will save you from a messy, leaking result.

1. Shim for Perfect Plumb. Remove existing wall material down to the studs if necessary. Install cement backer board using galvanized screws, leaving a 1/8-inch gap between sheets and at the corners.
2. Seal Every Seam Twice. Apply a high-quality liquid waterproofing membrane over the entire board surface and over all seams. Embed alkali-resistant mesh tape into the wet membrane at every joint and corner.
3. Center and Dry-Fit First. Measure the width of the wall and mark a vertical center line. Dry-fit your tiles horizontally to ensure you won't end up with tiny, sliver cuts at the corners.
4. Level Is Everything. Screw a straight 2x4 piece of lumber horizontally into the wall, positioned exactly one tile-height plus a grout line above the shower floor. This provides a level, weight-bearing base for the first course.
5. Set Firm and Straight. Spread thin-set mortar using a notched trowel, covering only as much area as you can tile in 15 minutes. Press tiles firmly into the mortar, using spacers to maintain uniform gaps.
6. Pack and Wipe with Precision. Remove all spacers once the mortar cures for 24 hours. Push grout into the gaps using a rubber grout float held at a 45-degree angle, wiping away excess with a damp sponge.