Tiles fail at the bed, not the tile. Choosing the right bed for the tile and the base is what keeps floors solid and walls in place.
Mortar Bed or Adhesive?
| Cement mortar bed | Tile adhesive | |
|---|---|---|
| Thickness | Thick — levels uneven bases | Thin — needs a flat base |
| Bond to vitrified tiles | Weaker (low absorption) | Strong |
| Large-format tiles | Risky | Preferred |
| Wall tiles | Common traditionally | Preferred |
| Tile over tile | Not suitable | Suitable with the right type |
| Curing | Needed | Generally not water-cured |
Laying With a Cement Bed
- Clean and wet the base.
- Spread mortar (about 1:4–1:6) to level.
- Apply cement slurry or neat cement to the bed or tile back.
- Place and tap tiles to full contact.
- Check level and joints.
- Grout after the bed has set; cure.
Laying With Adhesive
- Flat, clean, sound base.
- Mix adhesive to the maker's instructions.
- Spread with a notched trowel; back-butter large tiles.
- Press and slide tiles into place for full coverage.
- Grout after the specified time.
The Short Version
Cement beds for levelling uneven floors; adhesive for vitrified, large and wall tiles. Full contact under every tile, and a compacted base, prevent hollow tiles.
