A stain means water has already travelled some distance
Water rarely enters directly above where a stain appears — by the time it shows on the ceiling, it's usually already tracked along timber and insulation to get there.
The insulation is likely already wet
Wet insulation loses much of its effectiveness and can stay damp for a long time, creating conditions for mould even after the original leak is fixed.
Timber exposed to repeated wetting will eventually rot
A stain that reappears after rain, even faintly, means the timber above is being repeatedly wetted — the kind of ongoing exposure that leads to structural rot over time.
It rarely gets better on its own
Roof leaks don't self-heal. A stain that's been ignored for months is a leak that's had months to cause further damage, even if it looks stable.
A proper trace will find exactly where the water is coming from — get in touch about a leak survey.