Repairs and problems
Ceiling stains below a bathroom: reading the evidence
The short answer
A ceiling stain tells you there is water above and very little else. Its shape, timing and whether it grows during use narrow the source.
Likely causes
- A stain that darkens during a shower and
- dries between uses points to the shower zone or its waste rather than a supply pipe.
- A supply leak generally produces a continuous
- growing stain regardless of whether the bathroom is being used.
Where jobs go wrong
A stain that darkens during a shower and dries between uses points to the shower zone or its waste rather than a supply pipe.
Common questions
Should I open the ceiling?
Only once the likely source is narrowed, ideally after isolation testing from above.
Is a stain always active?
No, historic stains persist. Marking the edge with pencil and re-checking tells you whether it is growing.
Questions about bathroom leaks into ceilings?
A short phone call usually answers more than a long email thread. Ask anything, including the awkward questions.