Tiles rarely fail overnight. They warn you first. A hollow sound underfoot, grout that crumbles away, a tile that lifts at one edge, or a crack that runs across two tiles all point to something happening under the surface. Here is what each sign means, and how urgent it is.

Tile Failure At A Glance

• Hollow or drummy sound when tapped: the tile has lost its bond with the surface underneath
• Crumbling or cracked grout: water now has a path into the screed and the wall behind.
• Tiles lifting, tenting or popping up: the tile panel has no room to expand and is pushing against itself.
• Cracks running across tiles and grout lines together: the surface underneath is moving, not the tile

Three of these four are installation issues, not tile quality issues. That matters, because replacing the tile without fixing the cause resets the clock.

Sign One: They Sound Hollow When You Tap Them

Tap along the floor with a coin or the back of a screwdriver. A solid tile gives a dull thud. A failed one gives a drummy, echoey ring.

That hollow sound means the adhesive is no longer holding the tile to the screed, usually because coverage was too thin, the screed was dusty, or it was tiled before it had cured. A drummy tile is not stable. It will crack the first time something heavy lands on it, and the surrounding tiles are often loose too.

Sign Two: The Grout Is Cracking Or Crumbling

Grout is the wear layer. When it goes powdery or lifts out in strips, water starts travelling into the screed instead of running off the surface.

In a shower or around a bath, this is the one to act on quickly. Water behind tiles can show up months later as damp on the other side of the wall, lifting skirtings or causing a musty smell in the passage. Regrouting a sound floor is a small job. Repairing a soaked screed is not.

Sign Three: The Tiles Are Lifting Or Tenting

Two tiles rise against each other into a small ridge, sometimes with a crack like a gunshot. This happens most often on sun-facing patios, near sliding doors and on newer floors.

The cause is almost always missing or badly placed movement joints. Tiles and screed expand and contract at different rates, and if the panel has nowhere to move, the only way out is up. Lifting tiles are a design problem, so a repair that does not add movement joints will lift again.

Sign Four: Cracks That Run Across Tiles And Grout Lines

A single chipped tile is damage. A crack that carries on in a straight line through several tiles and the grout between them is movement in the slab or screed underneath.

Look for it near door openings, along new-build joins, and where a floor changes level. The tile is the messenger here, not the fault. Assess the substrate before relaying anything.

Repair Or Replace: How To Tell

• Isolated cracked tile; the rest sounds solid. Repair it if you have spare matching tiles.
• Worn or cracked grout only: regrouting and resealing
• A cluster of drummy tiles, or lifting: lift and relay that section at minimum.
• More than roughly a quarter of the floor sounds hollow: budget for a full replacement.

What A Good Tiler Checks Before Quoting

Tiling is not a licensed trade in South Africa. There is no COC for a tiled floor, so rely on a good tiler. A quality, vetted, competent tiler will still work to SANS 10107, the code of practice for the design and installation of ceramic tiling, and will check:

• Whether the screed is sound, dry and free of dust before pricing
• Where movement joints and perimeter joints need to go
• That the adhesive suits the tile, the substrate and the exposure
• That the tile itself is rated for the area, especially outdoors and in wet rooms

If a quote arrives without anyone looking at the floor, treat it as a guess.

Frequently Asked Questions

Why are my tiles lifting off the floor?

Almost always missing movement joints. The tile panel expands, has nowhere to go and pushes upward. Sun exposure and a fresh screed both make it more likely.

Do hollow sounding tiles need to be replaced?

Yes, if you want the repair to last. A tile that has lost its bond cannot be re-stuck from the top, and hollow areas should be lifted and made good before new tiles go down.

Is cracked grout serious?

In dry areas, it is cosmetic for a while. In showers, bathrooms, and outdoors, it is a water path, and water damage costs far more than regrouting.

Can I replace just one cracked tile?

Often yes, if the surrounding tiles sound solid and you have matching spares. Cutting one tile out without cracking its neighbours is the tricky part.

Do tilers need a licence in South Africa?

No. Tiling is unregulated, so check for verified identity, proof of past tiling work and references instead.

Not Sure Which One You Have?

Tap a few tiles, check your grout lines and take a photo of anything lifting. Then let Kandua help you sort it out, so you know whether you are looking at a regrout, a section relay or a substrate problem before anyone quotes you.

For small tile and grout repairs right now, a vetted Handyman is available for selected services in supported areas.

Follow Kandua on Instagram, Facebook and LinkedIn for seasonal maintenance prompts and fair price benchmarks.

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