Hi there. The front wall of my circa 1880 terrace house has develope
small dark patches about 3' up from the floor. I know that the wall ha a damp course put in in 1984, and that this damp course was treate again in 2004. I'm not suire whether the dark patches that hav appeared are damp or not, and I would be really grateful for any advic about this. Could this be residual damp from pre1984?Or could there b aproblem with the plaster? I have checked the plaster on the outside o the wall, and it looks fine
-- robtiffen