We were asked to look at a growth on the ceiling of a basement
This is typical of poor ventilation along with an unresolved leak - the right growing condition of dry rot.
Once established can spread rapidly and even to adjoining properties.
If you see any sign of mould / fungi, it’s very important that you get it checked out before it spreads.
Untrained treatment can make matters worse.
If you have any concerns please do not hesitate to us.