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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
apc-
It's just above ground level, maybe a foot and a bit up, outside looks sound, but that side of the house gets no sun as in-between houses, and all the plaster on the inside is a mess as apparently when the houses were built it was plastered mid winter, and in a hurry ( were taking 1950s here, so some of the materials were a bit 'experimental'. Condensation was a right fucker last winter, but the loft is much better insulated now, the radiators are better,
and the rest is getting plastered too so that should help with warmth and I'm retrofitting trickle vents in some windows too so that should help with breathability etc. The house had next to no proper upkeep for the last few years, so I will repoint that wall in summer as some other areas need it. I've used the Jewson's silicon damp proof stuff before on a similar age building ( 50s council flat) and it worked a treat
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