Just about to move into a place that has weird dappling on the ceiling. It's not light shadows; it's still there when the light's off. I thought it could be shadowing but reading about that it looked like that is normally in lines following rafters. This is marks around a circle of no marks Any ideas what it is and the cause? Hoping it's not mould, but if it is, what could be the cause?
Does the surface feel damp ? To me it looks like an early stages of damp. I saw something similar in last summer, the cause was a very small leak in bathroom above. The other potential issue is lack of proper ventilation as lot of houses now are too well sealed with no escape for water vapour caused by normal activities like cooking.
Thanks for replying. No it didn't feel damp. Forgot to mention it's a bungalow, not sure if that's relevant.