How to Fix Loose Tiles and Regrout Cracked Grout
Learn how to refix a loose wall or floor tile and replace crumbling grout, including how to find the cause, choose adhesive and grout, and get a tidy finish.
A single loose tile or a run of crumbling grout is more than an eyesore: it lets water in behind the surface, which leads to swollen backing boards, mould and bigger repairs. The fix itself is straightforward. What makes the difference is working out why the tile came loose before sticking it back.
Work out the cause
Tap tiles gently with the handle of a screwdriver. A hollow sound signals a tile that has lost its bond. Then look around for causes:
- Water getting in. Failed grout or sealant around a bath, shower or sink lets moisture behind tiles.
- Movement. Floors that flex, a bath that moves or a wall that expands and contracts can crack grout and loosen tiles.
- Poor original adhesion. Missing adhesive, dusty surfaces or a thin spread.
- Impact. A dropped object or a knocked corner.
If the substrate is soft, damp or crumbling, fix the cause first. A new tile on a damp wall will fail again. In bathrooms, the usual culprit is the seal; see how to reseal a bath with silicone.
Refixing a single loose tile
- Remove the tile. If it is not already off, gently lever it with a scraper, protecting adjacent tiles. Tape across the surface to hold fragments if it is cracked.
- Clean the back and the wall. Scrape old adhesive from both, and vacuum dust. The surface must be sound, clean and dry.
- Check size and fit. Dry-fit the tile to make sure it sits level with its neighbours.
- Apply adhesive. Use a suitable tile adhesive, ready-mixed for walls or a flexible cement-based one for floors and wet areas. Spread with a notched trowel on the wall or tile back.
- Press into position. Wiggle gently to seat it, use spacers to hold the gap and wipe off any squeeze-out.
- Leave to set. Follow the instructions on the product, typically a day, before grouting.
- Grout and clean off the haze.
Regrouting
- Remove old grout. Use a grout rake or oscillating tool, working carefully to avoid chipping tile edges. Aim to remove about two-thirds of the depth.
- Clean the joints. Vacuum and wipe so no dust remains.
- Mix the grout. Follow the pack ratios. For wet areas, use waterproof or flexible grout, and consider an anti-mould one.
- Apply. Press grout in with a rubber float at 45 degrees, filling joints fully and wiping off excess diagonally.
- Clean and polish. Wipe with a damp sponge after the time stated on the pack, rinse often, and polish with a dry cloth once a haze forms.
- Seal if needed. Cementitious grout in wet areas may benefit from a sealer.
- Use silicone, not grout, at changes of plane. Corners, tile-to-bath joints and where tile meets worktop need flexible sealant.
Common mistakes
- Grouting before the adhesive has cured
- Removing too little old grout
- Using rigid grout in joints that move
- Skipping cleaning of the substrate
- Wiping the grout too early or too late
- Using too much water, which weakens grout
When it is bigger than a handyman job
If many tiles are loose, if the wall is damp, or if there is a bounce in the floor, a tiler or builder may be needed to investigate. Large-area retiling and waterproofing of wet rooms are specialist work. Check handyman or tradesperson to decide.
Costs
Typical handyman prices for refixing a tile or two are modest, while regrouping a bathroom takes longer because of the preparation. Prices vary by region and the size of the area, and many handymen have a minimum charge; see handyman minimum call-out charges.
Getting it done
You can send a request through Compito with your postcode and photos of the tiles. Compare offers from ID-verified local providers, ask questions by message, accept and pay online, and leave a review after the booking is complete.
A worked example: shower wall corner
A bathroom has three loose tiles near the shower and a corner joint grouted rather than sealed. The handyman lifts the loose tiles, finds the backing slightly damp and leaves it to dry, then refixes with flexible adhesive, grouts and finishes the corner with silicone. The visit is spread over two days because of drying. If the board had been soft, the job would have become a plasterboard and tiling repair instead, which is why the cause matters.
Choosing products
- Adhesive: use a flexible, water-resistant type in wet areas and on floors that may flex.
- Grout: choose a type for the joint width and use. Epoxy and flexible grouts resist stains and movement better but cost more.
- Sealant: sanitary silicone for corners, tile-to-bath and tile-to-worktop joints.
If you cannot match an old tile, remove one from a hidden area, such as behind the toilet, to use as a sample for a supplier or tile shop.
Tiles on floors
Loose floor tiles often point to movement or damp. Lift gently, check for hollow patches and look for cracked tiles nearby. If a whole area sounds hollow, ask a tiler to assess it before repairs, because individual tiles will keep popping. Underfloor heating means extra care; ask the installer or manufacturer before drilling or lifting tiles.
Aftercare
Keep water off the area for the time stated on the product, then avoid harsh abrasive cleaners that wear grout. Seal where recommended and re-check corners once a year, as that is where leaks start. See how to deal with mould around sealant.
Frequently asked questions
Can I regrout over old grout?
It is better to remove at least part of the old grout so the new one can bond and sit at the right depth.
How long before I can use the shower?
Follow the product instructions. Grout and adhesive often need a day or more to cure before they are exposed to water.
Why does my grout keep cracking?
Often because of movement or because the wrong product has been used. A flexible grout or a sealant at corners can help.