Single skin walls are going to be hard to keep dry but i think i would render it with water proofer then paint some sandtex or weathersheild paint on . Then batten celotex then ur plasterboard. You could put up some plastic vapor barrier after you put up your insulation.
hi all first time on here need a little advice. got a BAXI 105E with the fan light flashing . Fan i s working fine , what other problem could it be . theres a sensor on the flue by the fan could that be the problem? Any advice please. thanks