So my house has solid walls and is generally cold, damp patchs can occur if i leave things up against walls ect, although the windows are bad at the moment too, in the porch you can wipe the wall with a towel during the winter and it'll be soaked in no time, luckily we never go in there so my question is this, as i decorate and do up the house i would like to insulate with thermal backed plasterboard, to save space in smaller rooms like my bathroom, can i remove the current plaster on external walls, 20mm thick in places if not more & dot and dab the thermal stuff directly to the brick? It seems like the common sense thing to do however most illistrations online show Brick, Old plaster, Battons/dab, thermal. rather than brick, dab, thermal? I'm just wondering if there's a reason for more people not removing the old plaster, other than the mess? also, with regard to the vapour barrier, is this built into the thermal plasterboard, or would i need to stick this to the wall after, before dabing? I'd rather spend the money now than have to replace wallpaper & tear everything up over and over? any info regarding this would be great, have read through a few other posts and replys too, sigh. can't we have ever lasting sun?