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you need to find the source of the damp before just painting over it
Nothing on the other side of the wall thats obvious? blown render, gutters etc?Otherwise it is probably condensation forming on cold walls
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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
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Guess I'm saying if the plaster has blown get it off, and see the condition of other plaster that may have been added or if the bond of the under coating has deteriorated beyond repair, putting bitumen paint on an interior wall is more drastic than I've ever heard
apc
bluehuw
@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