How-To GuidesCracked and loose floor tiles
Why tiles crack, lift or sound hollow, when replacing a single tile is enough, and when the problem is the floor underneath rather than the tile.
By Elijah Canfield, Founder, Hire Best Pros · Updated August 26, 2026
Elijah Canfield is the founder of Hire Best Pros. He writes and edits the site's consumer guides, with a focus on how home service and moving projects are priced, scoped and compared.
A single cracked tile from a dropped object is a simple replacement. Tiles that crack in a line, lift at edges, sound hollow when tapped or pop up on their own are telling you about the assembly underneath: subfloor movement, missing expansion joints, poor mortar coverage or moisture. Fixing the tile without fixing the cause means doing it again.
Key points
- Cracks that follow a straight line across several tiles usually mean movement below.
- Hollow sound means the tile is not fully bonded.
- Keep spare tiles from the original installation. Matching later is difficult.
What the pattern tells you
| What you see | Usual cause |
|---|---|
| One cracked tile, impact point visible | Dropped object. Replacement only |
| Cracks in a line across several tiles | Subfloor movement, deflection or a crack in the slab below |
| Tiles lifting or tenting along a run | Missing or filled expansion joints, no room for movement |
| Hollow sound when tapped | Poor mortar coverage during installation |
| Loose tiles in a wet area | Moisture reaching the setting bed or a failed waterproofing detail |
Replacing a single tile
Replacing one tile is a realistic homeowner job when you have a matching spare. It involves removing the grout around it, breaking the tile out from the center without damaging neighbors, cleaning the old mortar back to a flat bed, setting the new tile at the same height and matching the grout.
Wear eye protection, and be aware that matching grout color on an aged floor is often the visible part of the repair.
When it needs a professional
- Cracks that reappear in the same place after repair
- Several tiles loose or hollow across an area
- Tenting or lifting, which means the field is under compression
- Any tile failure in a shower or wet area, where waterproofing may be involved
- A bouncy or deflecting floor, which is a structural question before it is a tile question
Tiles failing across an area?
Find flooring helpCommon questions
- Why do my tiles sound hollow?
- Hollow sound means there is a void between the tile and the setting bed, usually from incomplete mortar coverage. The tile may hold for years, or it may crack under load. It is worth monitoring and worth raising if it is widespread.