Tile is set in a bed of thinset mortar over a flat, stable surface, spaced evenly, then grouted. The two decisions that make or break the result are layout and trowel size.
Layout from the center
Find the center of the room and dry-lay a row in both directions to see where the cuts fall. Adjust so you don’t end up with a sliver of tile against a wall — aim for balanced, larger cuts on both sides. Snap reference lines and work outward from the center.
Setting and spacing
Spread thinset with a notched trowel sized to the tile (bigger tiles need a deeper notch for full coverage), press each tile with a slight twist to collapse the ridges, and use spacers for consistent grout lines.
| Tile size | Typical trowel notch |
|---|---|
| Mosaic / small | 1/4″ × 1/4″ |
| Up to ~8″ | 1/4″ × 3/8″ |
| 12″–16″ | 1/2″ × 1/2″ |
Let the thinset cure (often overnight) before grouting. Periodically pull a tile to confirm full mortar contact on the back — hollow spots crack under load.
Frequently asked questions
Where do I start tiling? From the center of the room, so cuts at the walls are balanced.
What size trowel? Match it to the tile — larger tiles need a larger notch.
How long before grouting? Usually after the thinset cures overnight.