Searching through the old posts, this subject has already been discussed to death :<)
My problem is slightly different. One of my outside walls which abuts on my neighbour's garden, has traces of mold and which has caused the paint to blister. The wall was injection treated for rising damp about eight years ago, and the wall itself was plastered on the inside and painted about four years ago.
I checked the ouside of the wall in my neighbour's garden and there are no piled-up mounds of earth that might have caused moisture to bridge across the damp treatment. But I noticed that the wall is not platered on the outside, and some of the bricks in the wall are damaged. Is there a treatment that I can use? Is inside or outside treatment the best? For now, I used a coat of varnish on the inside wall and then repainted.