We have a conservatory built onto the kitchen on our house,it was there when we moved in, now its not the best build and consists of a single skin lower brick wall, with pvc windows and a felt roof, the pvc windows and roof are fine, the brickwork is plastered inside and we had it rendered ouside to smarten it up. In the very cold weather the condensation is a problem,we bought a de humidifier which has helped a great deal,but on the brickwork it' s still a slight problem with black mould patches showing. If i was to dry line this wall, studding it over,putting insulation inbetween and covering with plasterboard, and capping off with a PVC windowsill, would this eliminate it showing again, should i treat the single skin wall with anti damp paint before covering it. Its not a huge problem but gets me loads of earache from her indoors. Any help or advice appreciated.