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thanks for reply. there is a door seperating porch from main house and it does have a radiator and a window. dont think its insulated and only happens when really cold outside

2yrs ago had a porch built. this year noticed when gets cold outside the wall hall wet patches on walls especially in corners. dont think any insulation was put in. its single block exterior and plasterboard interior. is there anyway i can insulate it or will i have to rip down board and redo it...