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Fix loose floor tile: inject, lift relay, full spread thinset

We'll re-bond loose tile with full thinset coverage or controlled injection—or stop for wet subs.

Troubleshooting · Home maintenance
2–8 hours
What you'll need
  • Rubber mallet and level
  • Replacement thinset
  • Grout removal tool
  • Optional injection epoxy kit
Step 1 of 3

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Steps

Goal: Tell spot debond from systemic floor movement before choosing injection or relay.

  • Tap out hollow zones; check for leak stains nearby.
  • Good: Dry, localized—remove tile and relay with full coverage.
  • Bad: Spongy underlayment—replace layers, then tile.

Inject

Goal: Use manufacturer epoxy injection only when relay risks destroying a unique surface.

  • Drill ports per kit; pump slowly; watch for bulging.
  • Good: Hollow sound gone and tile feels solid.
  • Bad: Epoxy runs into wrong cavity—stop and reassess.

When to get help

Call a tile contractor if:

  • Uncoupling membrane or crack-isolation was required and skipped.
  • You need stone calibration for lippage.

Verification

  • No hollow tap; tile does not rock under foot twist.
  • Grout joints match plane and width.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Tap test Outline hollow.
  2. Remove relay Full thinset bed.
  3. Injection If kit appropriate.
  4. Pro Structural slab.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Tile size format
  • Wet subfloor history
  • Heated floor wire

Is the substrate wet or soft?

Probe from edge.

Yes: Fix leak; replace underlayment. No: Relay with full bond.

Yes No

You can change your answer later.

Dry and rebuild

Stop water; replace damaged layers; then tile. Mold: Remediation.

Done

Full spread set

Remove tile; flat bed; beat in. Hollow field: Pro assessment.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Can I glue a loose tile from the top?
Surface glue fails—either inject rated epoxy under controlled procedure or remove and relay.
Why is only one corner hollow?
Spot bond or lippage stress—relay with full coverage.
When is injection better than removal?
Historic murals, single expensive slabs, or risk of breaking adjacent tiles.

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