If a tile sounds hollow when you tap it, it has gone drummy, meaning it has lost its bond to the surface underneath and now has an air gap behind it. You can often fix a drummy tile by injecting adhesive through a small hole, or by lifting and relaying it, and the right choice depends on whether the tile is cracked and how much has come loose.
This guide explains what drummy means, how to run the tap test yourself, the difference between injection and lift-and-relay, and when the job is one to hand to a professional. It sits within our Tile Repairs, Regrouting and Restoration in Adelaide guide.
What "drummy" actually means
Drummy is the trade word for a tile that has lost its grip on the substrate below. When it was laid, adhesive bonded the tile to the floor or wall. Over time that bond can break, leaving a pocket of air between the tile and the surface. The tile may still look flat and perfect, but it is no longer stuck down properly.
The name comes from the sound. Tap a well-bonded tile and you get a solid, dull note. Tap a drummy one and it rings hollow, like a small drum, because you are hearing the air gap behind it.
Loose and drummy are related but not identical. A loose tile has visibly lifted or rocks when you press it. A drummy tile can look completely fine and still be hollow underneath. Every loose tile is drummy, but plenty of drummy tiles have not moved yet.
The tap test: how to check your tiles at home
The tap test is the simplest way to find drummy tiles, and you can do it in a few minutes with no tools.
- Use your knuckle or a coin. Tap firmly across the face of each tile and along the grout lines.
- Listen for the change in sound. Solid tiles give a sharp, dense tap. Drummy tiles sound hollow, echoey or higher-pitched.
- Work in a grid. Tap the centre and all four corners of each tile, because a bond can fail in just one area.
- Mark the hollow ones. A small piece of low-tack tape on each drummy tile shows you the pattern.
That pattern matters. One isolated drummy tile is usually a local problem. A spreading patch, or a run of drummy tiles along one line, often points to something bigger below, like a moving substrate, moisture, or a floor laid without expansion joints. If the hollow sound comes with cracking, that is a stronger warning sign, and our guide on why your tiles are cracking walks through what is driving it.
Injection versus lift-and-relay
There are 2 main ways to fix drummy tiles, and they suit very different situations.
Injection re-bonds the tile without removing it. A tiny hole is drilled through the tile or a grout line, then a low-viscosity epoxy or adhesive is injected to fill the air gap and re-anchor the tile to the substrate. It is quick, keeps your existing tiles, and avoids the mess of removal.
Lift-and-relay means removing the affected tiles, cleaning off the old adhesive, fixing whatever caused the failure, then laying the tiles back down (or fitting new ones if they broke on the way up). It is more work, but it is the only proper fix when the bond has failed badly or there is a problem underneath.
Here is how the two compare:
| Factor | Injection | Lift-and-relay | | --- | --- | --- | | Tile condition | Must be intact and uncracked | Works even if tiles are cracked or broken | | Area affected | Small, isolated drummy spots | Large or spreading areas | | Substrate issue | Only if the base is otherwise sound | Fixes movement, moisture or a failed base | | Wet areas | Risky if waterproofing is involved | Lets you inspect and repair waterproofing | | Mess and time | Low, often same day | Higher, needs drying and curing time | | Matching tiles | Keeps your existing tiles | May need spares if any break |
Injection is the neat, low-disruption option when a couple of sound tiles have popped their bond on an otherwise healthy floor. Lift-and-relay is the honest fix when tiles are cracked, the drummy area is spreading, or the trouble is coming from the layer below. If you are weighing whether to patch or start over on a larger area, our piece on regrout or retile helps you decide.
Fixing a single drummy tile yourself
If you have one intact, isolated drummy tile on a dry floor, a careful DIY repair is achievable. In rough terms:
- Confirm with the tap test that only the one tile is affected.
- Drill 2 or 3 small holes through the tile or into the grout lines with a tile bit.
- Inject a suitable low-viscosity tile adhesive or epoxy into the void.
- Weight the tile down evenly and leave it to cure fully before use.
- Re-grout the drilled holes and clean up.
That said, be honest about the limits. Drilling can crack the tile, matching old grout is fiddly, and if you guess wrong about what caused the bond to fail, you are treating the symptom and not the cause. For anything beyond a single dry-area tile, the cost of getting it wrong usually outweighs the saving.
When to call a professional
Some drummy tile jobs are DIY-friendly. Plenty are not. Call in a vetted tiler when:
- The tile is in a wet area. Shower floors, walls and splashbacks sit over waterproofing, and drilling or lifting the wrong way can breach it. Water getting past the membrane is how a small repair becomes a full re-tile.
- The drummy patch is spreading. More than a few hollow tiles usually means a substrate, movement or moisture problem that has to be diagnosed and fixed, not just re-bonded.
- Tiles are cracked as well as drummy. Cracking plus hollow sound points to stress in the floor, and relaying is the durable answer.
- You cannot source matching tiles. A pro can often blend a repair, source a close match, or advise on a feature tile if the original is gone.
A good local tiler will run the same tap test, work out the real cause, and quote injection or lift-and-relay honestly rather than defaulting to whichever is easier for them.
What it costs and how to compare fairly
Costs vary with the tile, the access and how much has come loose. As an indicative Adelaide guide:
- Small tile repair (a tile or two): roughly $150 to $450
- Tile removal, if lifting is needed: roughly $20 to $40 per square metre
- Larger lift-and-relay: priced per job once removal, prep and relaying are added
The cheapest quote is not always the best value here. A repair that skips diagnosing the cause, or that injects over a real substrate problem, tends to fail again within a year. If you are torn between a quick repair and replacing the area outright, our comparison of tile repair versus replacement cost breaks down when each one is worth it.
The smart move is to get a couple of quotes from vetted, licensed tilers on the same job, so you can see what fair looks like. You can read more about the range of fixes on our tile repairs service page.
Get your drummy tiles looked at
Not sure whether your tiles need a quick injection or a proper relay? Tell us about the job and we will connect you with vetted Adelaide tilers who will run the tap test, find the real cause, and quote it honestly, free and with no obligation. Get matched with a local tiler.