Installing New Bathroom Tile: A Step-by-Step Guide

Bathroom tile work intimidates most homeowners, but it's fundamentally about three things: a clean, flat surface; consistent spacing; and patience. The actual mechanics—spreading mortar, pressing tile, grouting—are straightforward once you understand them. Where people go wrong isn't complexity; it's rushing the substrate prep, mixing grout too wet, or spacing tiles unevenly. Install tile correctly and you're looking at a surface that'll last 20 years with minimal maintenance. Rush it and you'll have cracked grout, loose tiles, and water damage in two.

1. Remove Old Tile and Prep the Surface. Use a cold chisel and hammer to break out old tile in sections, working from a grout joint. Once tile is gone, scrape away all old mortar and debris down to bare substrate. If you're working over existing drywall in a shower, remove it—water will find any void. Replace with cement board, secured with corrosion-resistant fasteners. Sand any high spots so your surface is flat to the straightedge.
2. Waterproof and Prime the Substrate. Apply waterproofing membrane over the entire tiled area, especially around shower bases and behind sinks. Use a liquid membrane or sheet product rated for wet areas. Prime any bare drywall with alkali-resistant primer before membrane application. Let the waterproofing cure per manufacturer spec—usually 24 hours.
3. Dry-Lay Your Tile Pattern. Lay tiles out dry on the floor or wall in your final pattern without mortar. Start from the center of the space and work outward to avoid thin slivers at edges. Use spacers to maintain even grout lines. Mark reference lines with chalk so you can return to this layout. This takes 20 minutes but prevents layout mistakes that cost hours.
4. Mix and Apply Thin-Set Mortar. Mix thin-set per package instructions—it should be peanut butter consistency, not soup. Use a notched trowel (size depends on your tile; check the bag) held at 45 degrees to comb ridges into the substrate. Apply only as much as you can cover in 15 minutes; mortar sets fast. Work in small sections rather than trying to cover the whole wall at once.
5. Set Tiles and Space Them Evenly. Press the first tile firmly into mortar with a slight twisting motion, then place spacers on all four corners. Continue placing tiles row by row, checking every few tiles with a level to catch high or low spots early. Adjust mortar depth if a tile sits too high or sinks too low. Remove excess mortar from grout joints immediately with a utility knife—dried mortar is much harder to clear.
6. Wait for Mortar to Cure Fully. Leave the tile undisturbed for 24 hours minimum. Don't walk on it, don't touch it, don't adjust anything. Thin-set needs full cure time to develop strength. Check the package for your specific product—some high-heat environments or large tiles need 48 hours. This wait time is non-negotiable; rushing to grout guarantees loose tiles.
7. Mix and Apply Grout. Mix grout to a peanut butter consistency—thicker than mortar, thinner than putty. Using a grout float held at 45 degrees, force grout into joints diagonally across the tile face, then scrape excess back at a steeper angle. Work in small sections (3 by 3 feet). Let grout firm up for 15–20 minutes, then damp-sponge the face of the tiles to expose them cleanly and smooth the grout lines.
8. Cure Grout and Apply Sealer. Let grout cure for 72 hours before exposing it to water or heavy use. Once cured, apply grout sealer per product instructions—typically a brush-on or spray-on application. Seal tile grout annually in high-moisture areas like showers. For natural stone tiles (marble, slate), apply stone sealer as well. These products protect against staining and water infiltration.