We had our conservatory insulated by a professional and well recommended company last week. Essentially they place a reflective film on the glass, and then cover with foil insulation, board over and plaster. We waited for this to dry out and then had it decorated.
The problem we are having - which we had never noticed prior to the work - is that there is a ‘damp’ patch forming every night in a circular pattern around the existing supporting internal pole - not sure if this is decorative or actually supportive. It seems to dry out in the day and then reappear overnight. This started happening prior to the decoration and seems unaffected by rain, so I don’t think it’s a leak.
Since the plaster dried we have had a dehumidifier going and are starting to use a small heater to heat at various times of the day. The dehumidifier alone doesn’t seem to have solved.
Any ideas or suggestions?