Black shadowing

photos required, could be damp penetration or black mould more information is required, kind regards Joseph

Black shadowing on walls and ceilings is often caused by condensation, which can lead to mould growth, but it isn’t always a sign of damp. It can also be caused by penetrating damp, rising damp, or even soot and thermal bridging in some cases. To give you a more accurate answer, could you upload a few photos of the affected areas? It would also be helpful to know: - Is it on external or internal walls? - Does it appear after cold weather or heavy rain? - Is the area damp to the touch or just discoloured? With a few photos, we should be able to advise on the likely cause and the best course of action.