Replace a cracked floor tile
Remove one damaged tile, prepare its base and set a matching replacement flush with the floor.
Home · 2–4 hr + cure · Medium
Before you start
Before breaking tile, rule out underfloor heating and unknown old adhesive that could contain asbestos. Wear safety goggles and cut-resistant gloves, contain fragments and control dust with suitable protection and HEPA cleanup. Do not dry-grind the floor. Stop if the base is wet, loose, cracked or damaged during removal; a new tile will not repair an unstable assembly.
Tools and materials
- Matching replacement tile and spacers matching the existing joints
- Hand grout saw, small hammer, narrow chisel, scraper and HEPA vacuum
- Compatible cement-based tile mortar, clean pail, measuring container and suitable notched trowel
- Compatible grout, rubber float, grout sponge and clean cloths
- Safety goggles, cut-resistant gloves, suitable dust protection and protective covering
Check the problem
Check why the tile cracked
A single impact chip or crack surrounded by solid tiles may suit a local repair. Cracks continuing through several tiles, recurring cracks or movement under gentle pressure suggest a base problem. Resolve that before replacing the surface.
Find a tile that really fits
Compare a spare against the installed tile for size, thickness, finish and pattern. Allow for the original grout width. If no matching tile is available, decide on the appearance before removing anything; a nearly matching tile can stand out.
Steps
Isolate the damaged tile
Protect adjacent finishes and set up dust collection. Remove the grout completely around all four sides with a narrow hand grout saw, keeping the blade off neighboring tile edges and out of the base. This separates the damaged tile from the rest of the floor.
Break inward and lift out the pieces
Cover the damaged tile with a cloth and use light hammer taps near its center to break it into manageable pieces. Remove the cloth carefully. Work from the center outward with a shallow chisel, lifting fragments without levering against neighboring tiles.
Prepare a sound, even base
Remove old setting material carefully without gouging the supporting surface. Vacuum the recess and inspect it. It must be firm, clean and suitable for the new mortar. Stop for damaged backer board, a membrane you cannot preserve, dampness or a crack in the base.
Dry-fit and check the height
Place the replacement in the empty recess with spacers. Check the joint widths and leave room below for the mortar thickness permitted by its instructions. Remove the tile again. Do not use an excessive mortar mound to compensate for a deep or uneven base.
Mix mortar and comb even ridges
Measure and mix a small batch according to its label, including any rest and remix. Use the flat trowel edge to key mortar into the base, then comb parallel ridges with the approved notch. Spread only what you can cover while fresh; remove skinned mortar rather than wetting it again.
Bed the tile and verify coverage
Press the tile into place with a short sliding motion across the ridges. Lift it once to check transfer: the back needs the coverage required for this floor, with supported edges and corners, not separate blobs. Adjust the mortar if needed, reset, align the joints and check that the face is flush.
Let the mortar cure, then grout
Clean excess mortar from the joints before it hardens without shifting the tile. Keep traffic off until the mortar permits grouting. Remove spacers, prepare matching grout as directed and pack the joints with a rubber float. Wipe lightly at its cleanup stage with a well-wrung sponge.
Protect and check the finished repair
Respect the grout and mortar return-to-service times. Seal only if the grout requires it. After curing, inspect the tile for movement, chipped edges, an uneven trip edge or gaps in the grout. If cracking reappears, investigate the base instead of repeatedly replacing the tile.
Replacement is bonded and flush, grout is continuous, and the repair remains stable after the specified cure.
Tips
Keep a spare from the same batch
A spare tile is more dependable than trying to match a discontinued color later.
Check coverage, not just height
A tile can look level while resting on only a few ridges. Lift-check the fresh mortar transfer before the final setting.
Repeated cracks are a clue
If the new tile cracks in the same place, the movement underneath still needs attention.