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If there's a condensation issue, you'll need an air brick behind any stud wall - even a polythene wrap won't be 100% effective, other than at keeping any moisture trapped.
Taking plaster back to the wall is a pain though - particularly if it's gypsum over lime. The dust is killer (almost literally) and you need bith good extraction and filtration. It might gain you a couple of inches though.
NotThamesWater
Am mulling over options one how to increase the warmth of our sons bedroom. It's a very small room in an external corner of the house, north facing. Brick wall, no cavity. The walls get very cold, and also get damp in the corner due to condensation.
My current thought is to use insulated plasterboard, thickness yet to be determined. It's already a small room so I think I would lean towards a thinner product.
Would dot and dab be an option in this instance?
How does the vapour barrier on foil backed products work at the edges, no way to join the seams if they are at the back, unless im missing something?
Alliteratively could batten first and put a polythene sheet up first, but would eat into the floor space even more. Am debating chipping the plaster off back to brick to compensate, would make a hell of a mess though and not sure how much I'd even gain.
Anyone have an experience doing this kind of thing?