Plastering over a damp wall

Question

Hello. I have a problem with what I believe is penetrating damp on an internal wall. There is no damage to the skirting or the lower part of the wall. The damage seems to be just above waist heigh and is slowly creeping horizontally. It looks like it's just the skim which is falling off. Underneath the skim looks to be cement plaster?. (It's grey and rough) There also seems to be salts being produced making the plaster fall off. What would be the best way to deal with this so I can redecorate. The wall in question has tiles on the opposite side as It's a dry cleaners which originally didn't have tiles and I believe that the tiles are pushing the moisture through to my side of the wall. I really appreciate any help with this problem.  Thank you for your time.

Richard · Accepted Answer

Penetrative damp will require the plaster to be removed back to brick and then tanked and replastered. Where there is salts it will need removing as the salts will always return

Graham · Answer

If it’s rising damp then we have to apply a damp proof injection which is a cream, if it’s penetrating damp then first you have to find out where it’s coming in from and apply two coats of water proof rendering, if it cannot be applied from the other side then it has to be stripped your side then applied but no matter how many times you try to cover with plaster or paint and you don’t first stop the penetration it’s going to come back.

Jake · Answer

I would knock it back to brick, apply moisture board to the wall and skim over, is more costly but beneficial in long run. We have had the same problem with recent customers, we knocked the wall back to brick, but a membrane on moisture board then skim over.

Plastering over a damp wall

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