How to Lay Tile Step by Step

Prepare the substrate

The tile is only as good as what's underneath. The surface must be clean, dry, flat, and structurally sound. For concrete floors, fill any cracks and grind down high spots. For wood subfloors, install cement backer board using thinset and screws — tiling directly onto plywood is not recommended as it flexes and causes grout to crack over time.

Plan your layout — dry-lay first

Find the center of the room by measuring and snapping two chalk lines that intersect at 90°. Check they're square using the 3-4-5 method: measure 3 ft along one line, 4 ft along the other — the diagonal between those two points should be exactly 5 ft.

Dry-lay a full row of tiles along each chalk line without adhesive. This shows you where cuts will fall at the edges. Adjust the starting point so you don't end with a sliver of tile (less than half a tile width) along any visible wall.

Choose the right grout joint size

Grout joints aren't just aesthetic — they accommodate tile size variation and substrate movement. Standard recommendations:

Mix and apply thinset

Mix thinset to a peanut butter consistency — thick enough to hold ridges when combed, but still spreadable. Let it slake for 5–10 minutes after mixing, then mix once more before use.

Apply thinset with the flat side of the notched trowel, then comb it at 45° with the notched side. Hold the trowel at a consistent angle to create uniform ridges. Work in sections of 3–4 sq ft — don't spread more than you can tile before the thinset skins over (usually 20–30 minutes).

Set the tiles

Place each tile along your chalk lines and press firmly, giving a slight twist to embed it into the thinset ridges. Insert spacers at each corner. Check level frequently with a spirit level — adjust with a rubber mallet by tapping gently. Never use a metal hammer directly on tile.

Work outward from the center in quadrants. Save cut tiles for the edges — cut these last once the full tiles are set and you can measure precisely.

Allow thinset to cure — then grout

Wait at least 24 hours before grouting (48 hours for large-format tiles or natural stone). Remove spacers before the thinset fully hardens — usually within 20–30 minutes of setting each tile. Once cured, mix grout to a smooth consistency.

Apply grout with a rubber float held at 45°, pressing it firmly into the joints in diagonal strokes. Work in 3–4 sq ft sections. Remove excess grout from the tile face with the edge of the float before it hardens.

Clean and finish

After 20–30 minutes, clean the tile surface with a damp sponge using diagonal strokes. Rinse the sponge frequently — dirty water smears grout haze back onto the tiles. Allow grout to cure 48–72 hours before sealing.

Apply grout sealer to protect against staining. Natural stone tiles should be sealed before and after grouting. Leave expansion joints (filled with matching caulk, not grout) along all perimeter edges and at every 5–8m across large areas.