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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
bluehuw-
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
I'm boarding out the inside of my understairs cupboard next week. The exterior wall currently just has some shutty old blown plaster and one patch has a tiny bit of damp, as does the concrete floor- not much, just enough to send a cardboard box a bit mouldy over the course if a year. I have some Jewson silicon wall sealer for exterior masonry that you paint in and it permeates the brick to water tight it, and my dad reckons I should paint it with that black bitumen type paint as well. I then plan to batten out the wall, add some cavity wall insulation board such as kingspan ( leaving a few mm for an air gap) then board it out with 12mm ply or OSB.
Questions are; is it worth using the black bitumen type paint as well as the other or is this likely to cause probs with the bricks rotting in future etc?, and what type/depth of kingspan should I use on the exterior wall ( bearing in mind I don't want to loose to much storage space under there?
The whole thing is a bit of a dry run for doing similar in my garage next year in order to turn it into a studio/workshop/utility room, so I'd like to get it right this here first.
Any wisdom anyone? Cheers