A tiled shower or tub surround is one of the most water-exposed surfaces in a house, and the work behind the tile decides whether the wall lasts twenty years or fails in five. This article walks through the complete install: tearing out the old wallboard, hanging backer board, waterproofing the wet area, laying out level lines, setting tile, and grouting. Before committing to tile, weigh the material honestly against alternatives to tile in the shower, because the substrate, adhesive, and labor costs stay the same either way, and some wall materials skip grout maintenance entirely. The steps below follow the order that tile professionals use, with the measurements, material comparisons, and technique details you need for a flat, watertight result on the first attempt.
Assess the Alcove and Prepare the Substrate
Start by stripping the surround down to the studs. Old wallboard, glue, and previous waterproofing all have to go, because new tile will not bond to crumbling substrate and a hidden leak will ruin the new work. A surround is only as reliable as the pan beneath it, and homeowners who skip the inspection often end up scheduling shower pan membrane repair a few years later, so check the pan and its drain before you cover anything.
Cement Board, Foam Board, or Glass-Mat Gypsum
Three substrates dominate modern shower walls. Cement board is cheap, proven, and heavy, and it needs a vapor barrier behind it or a surface membrane on top. Foam board is light, cuts with a utility knife, and arrives waterproof when the seams are taped with the manufacturer system. Glass-mat gypsum panels cost less than foam and resist moisture, but they still need a waterproof membrane in wet areas.
When the Old Wallboard Has to Go
Pull the surround to the studs, then check the studs for plumb and flat. Shave high spots with a plane and shim low spots, because a wall that is out of flat a quarter inch over 4 feet will show as lippage in every tile joint. Replace any rotted framing and treat the wood with a preservative before hanging new board.
- Cement board: use 1/2 inch on walls, galvanized screws, and mesh tape on all seams.
- Foam board: cut with a utility knife and seal seams with the manufacturer tape and membrane.
- Glass-mat board: fasten with the same screw and tape system as cement board.
Tools and Materials Checklist
The right tools separate a weekend project from a month of frustration. The essential tile tools list starts with a wet saw for straight cuts, a manual snap cutter for small-format tile, and a set of trowels sized to the tile.
Trowel Sizes by Tile Format
The trowel notch controls how much thinset stays under the tile, and the wrong size leaves hollow spots or squeezes adhesive into the joints. Match the notch to the tile format and the flatness of the substrate.
| Notch size | Tile format | Notes |
|---|---|---|
| 1/4 x 1/4 inch | Mosaic and small wall tile | Comb in one direction only |
| 1/4 x 3/8 inch | Subway and wall tile up to 8 inches | Standard for most surrounds |
| 1/2 x 1/2 inch | 12-inch tile and small floor tile | Use a leveling system for flatness |
| 3/4 x 3/4 inch | Large format 12×24 and bigger | Back-butter the tile as well |
- Wet saw with a continuous-rim diamond blade for porcelain
- Tile spacers, a rubber float, and a grout sponge
- Membrane, mesh tape, and the manufacturer seam materials
- A 4-foot level or laser and a tile straightedge
- Safety glasses, gloves, and a respirator for cutting
Waterproofing the Wet Area
Waterproofing is the layer that keeps moisture away from the framing, and it is non-negotiable in a shower. Two systems dominate: liquid membranes painted or rolled onto the substrate, and sheet membranes bonded with thinset. Both work when the seams are handled correctly, and both fail when the installer rushes the overlaps. If the design includes a feature wall, tile murals in shower walls need the same membrane behind them as the field tile, because water does not care where the pattern changes.
Liquid Membranes vs. Sheet Membranes
Liquid membranes are forgiving on irregular surfaces and easy to touch up, but they need two full coats at the specified coverage rate, and the corners still need reinforcing fabric. Sheet membranes come with factory-made corners and a predictable thickness, but every seam is a potential failure point that must be rolled firmly into the thinset.
- Prime the substrate if the membrane manufacturer requires it.
- Apply the first coat or set the first sheet, covering all joints and corners.
- Embed reinforcing fabric in liquid membranes at corners and changes of plane.
- Apply the second coat, or tape and roll all sheet seams.
- Flood-test the pan before tiling if the system allows it.
Layout: Level Lines, Ledgers, and Borders
Layout decides how many tiles you cut and how visible the cuts are. Start at the tub or pan and work up, but never trust the tub edge to be level, because tubs settle and slope toward the drain. Snap a level line and build a ledger board to support the second row, which gives you full tiles where the eye lands. A decorative accent band laid from custom tile border sheets needs its own ledger and level line, so plan the band height before the field tile goes up.
Find the Low Point and Snap Level Lines
Measure up from the lowest point of the tub or pan, not the highest, and mark a level line at the height of one tile plus the grout joint. Screw a straight ledger board to the wall on that line and set the second row on it. Work upward from the ledger, then fill the bottom row last with cuts.
Plan Cuts So No Skinny Pieces Show
Dry-lay a row of tile on the floor to measure how the pattern lands, then shift the layout so the cuts at the corners are at least half a tile wide. Skinny slivers at the edges read as a mistake even when the tile is straight, and moving the layout a quarter inch usually eliminates them.
Setting Tile: Adhesive, Spacers, and Cutting
The adhesive question has a settled answer in wet areas: tile mastic versus thinset comparisons land on modified thinset for shower walls every time, because mastic re-emulsifies when it stays wet and turns soft behind the tile. Mix thinset to the manufacturer consistency, let it slake, and comb it in one direction.
- Comb thinset onto a small section, about enough for one or two tiles.
- Set each tile with a slight twist to collapse the ridges evenly.
- Insert spacers and check the face with a level or straightedge every few tiles.
- Cut tiles to size with the wet saw, and use a diamond bit for pipe holes.
- Wipe excess thinset out of the joints before it sets.
Cutting Around Fixtures
Mark valve and pipe penetrations from the back of the tile, drill a pilot hole, and cut with a hole saw or tile bit. Cut the tile in half at the valve line and notch each half so the escutcheon covers the cut. Score-and-snap cutters work on straight lines in smaller tile, but porcelain needs the wet saw.
- Do not set tile on thinset that has skinned over; scrape it off and remix.
- Do not walk on fresh tile for 24 hours.
- Do not grout until the thinset has cured for the time printed on the bag.
Grout, Sealant, and Curing
Grout fills the joints and gives the wall its finished grid, and the type you choose depends on joint width and traffic. Sanded grout goes in joints 1/8 inch and wider, unsanded suits hairline joints, and epoxy or urethane grouts add stain resistance where soap scum collects.
| Grout type | Best for | Joint width | Notes |
|---|---|---|---|
| Sanded | Wall and floor joints | 1/8 inch and wider | Standard choice, needs sealing |
| Unsanded | Narrow joints and polished tile | Under 1/8 inch | Won’t scratch glossy surfaces |
| Epoxy | High-traffic and wet areas | Any | Stain-proof, harder to work |
| Urethane | Commercial and steam showers | Any | Flexible, single-component |
Mix grout to a stiff peanut-butter consistency, force it into the joints with a rubber float held at 45 degrees, and clean the tile in slow circles with a damp sponge. Let the grout cure for the full time on the bag before the wall sees water, and seal sanded grout once it cures.
Caulk the Changes of Plane
Every change of plane, the corner between walls, the joint at the tub or pan, and the ceiling line, gets flexible caulk instead of grout. Grout cannot flex with the movement, so it cracks along corners within a season. Match the caulk color to the grout and tool it smooth.
If grout maintenance becomes the deciding factor at the next remodel, grout-free engineered stone shower panels offer a solid-surface system that skips the joints entirely. For a tile install, the payoff is the sequence above done in order: a flat wall, a dry wall, and grout lines that stay put for years.