Cracked grout or lifting tiles in a wet area
Cracked grout in a bathroom is not itself a leak, but it removes the first line of defence. Water then reaches the bed below and relies entirely on the waterproofing beneath — which, if the building is old enough, may not exist.
Stable enough to schedule properly. Best resolved before the next monsoon rather than during it.
Probable causes, ranked
Ordered by how often we find each one to be the actual source. The 'tell' is what distinguishes it from the others.
- 01most common
Normal grout ageing and shrinkage
The tell — Fine cracking along joint lines with tiles still firmly bedded.
Bathroom Waterproofing → - 02common
Movement in the sunk fill below
The tell — Tiles sound hollow and cracking follows a consistent line.
Bathroom Waterproofing → - 03common
Water already trapped in the fill
The tell — Grout stays dark and damp long after use.
Bathroom Waterproofing → - 04less common
Spot bedding leaving voids beneath tiles
The tell — Individual tiles rock underfoot.
Chequered Tiles Work →
Sixty seconds, before you call anyone
- Photograph it while it is actively wet. A dried stain tells a surveyor far less than a running one.
- Note whether it worsens with rain or with usage. Rain-linked points to the building envelope; usage-linked points to plumbing. This single distinction settles most arguments about responsibility.
- Check the area directly above and beside the damage, not only below it. Water travels along a slab before it drops.
- Look specifically for the tell of the most likely cause: fine cracking along joint lines with tiles still firmly bedded.
- Do not chip into saturated plaster or paint over a damp patch. The first risks bringing material down; the second destroys the evidence needed to trace the path.
What it becomes if you leave it
Low on its own. The real risk is that it hides whether the waterproofing beneath is intact, and by the time the flat below is stained the sunk has to be opened regardless.
Cracked grout or lifting tiles in a wet area — questions we get asked
What is the most likely cause of cracked grout or lifting tiles in a wet area?
Normal grout ageing and shrinkage. The sign that points to it is: fine cracking along joint lines with tiles still firmly bedded. That said, the ranking here is a starting point — the actual source is confirmed by survey, because more than one of these can be true at once.
What happens if I leave it?
Low on its own. The real risk is that it hides whether the waterproofing beneath is intact, and by the time the flat below is stained the sunk has to be opened regardless.
Can I diagnose this myself before calling anyone?
Partly, and it is worth doing. Photograph it while it is actively wet, note whether it worsens with rain or with usage, and check the area directly above and beside the damage. That single rain-versus-usage distinction narrows the cause more than anything else you can do in sixty seconds.
How urgent is this?
Plan it. Stable enough to schedule properly. Best resolved before the next monsoon rather than during it.
Send us a photograph and we will tell you what we think it is
WhatsApp a photo taken while it is wet, with a note on whether it tracks with rain or with usage. That is usually enough for a first opinion, and the site inspection that follows is free.
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