How to Repair a Cracked Bathroom Tile
A cracked tile isn't just cosmetic — it can let water in behind the wall or under the floor, leading to mold and structural damage over time. Replacing a single tile is a manageable DIY job if you can find a matching tile. Repairing hairline cracks with epoxy is even easier.
Likely Causes
- 1Impact damage (dropped heavy object)
- 2Tile laid over a substrate that flexes slightly (plywood subfloor)
- 3Freeze-thaw damage on outdoor or unheated bathroom floors
- 4Poor installation — no expansion gap or adhesive failed
- 5Settling causing the substrate to shift
Cracked shower or tub surround tiles allow water infiltration. Repair quickly to avoid water damage behind the wall.
How to Fix It: Step by Step
- 1Assess the crack
Hairline cracks without missing pieces: fill with tile repair epoxy or matching grout mixed thin. Broken or missing tile: replacement is the right approach.
- 2Remove old grout around the damaged tile
Use a grout saw or oscillating tool to remove grout from all joints around the tile. Work carefully to avoid damaging neighboring tiles.
- 3Remove the cracked tile
Score the tile surface with a utility knife. Use a cold chisel and hammer to break the tile into pieces and remove them. Work from the center outward to protect surrounding tiles.
- 4Clean the substrate
Scrape off all old adhesive from the wall or floor. The substrate must be clean and flat for the new tile to adhere properly.
- 5Set the new tile
Apply tile adhesive (mastic for walls, thinset mortar for floors and wet areas) to the back of the new tile using a notched trowel. Press firmly into place, using tile spacers to maintain even grout joints. Let cure 24 hours.
- 6Regrout
Mix unsanded grout (joints under 1/8") or sanded grout (joints over 1/8") to a peanut butter consistency. Work it into the joints with a grout float. Wipe off excess with a damp sponge. Let haze dry, then buff with a dry cloth.
Materials & Tools Needed
Warning Signs It's Getting Worse
- ⚠Tiles are loose or hollow-sounding when tapped (adhesive failure)
- ⚠Soft or spongy feel to the substrate under the tile
- ⚠Water stains appearing on the ceiling below a tiled shower
- ⚠Multiple tiles cracking in the same area
When to Call a Professional
Call a tile contractor if multiple tiles are cracking (substrate failure), if you see soft or spongy substrate (water damage), or if you can't source a matching tile and need an aesthetic solution.
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