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You mean hack the old plaster off? That would work except I need the cupboard I'm building under there to be good and clean for kitchen storage etc, so it really need boarding out with something. The point of adding the insulation board was really just because I thought it preferable to add it than not as warmer house=lower bills, better for us living there and better for the environment. The damp really is not too bad, I can just see/feel it's been there that's all. The wall was packed front to back with boxes until today, so breathability of that wall in the last 12 months will have been f-all, which prob helped cause the damp to show.
jeff80
Given it's under the stairs, and all that, is it necessary to give it a finish. with it being a problem area striping it back could be preferable (and the initial process) to additional layers .. more like leaving it raw