I am hoping that someone can help me.
The wife and I live in a lower flat (built in 1900), not surprisingly the flat has had extensive damp proofing work over the years.
Recently a damp patch appeared in one side (living room side) of an internal wall (shared between the bedroom and living room). We had the DPC reinjected and the wall was replastered.
90% of the new plastering has dried, however I still seem to have a series of patches that have not dried (its been about 10 weeks), the patches are at the sites of the original damp, one of the patches has salts forming.
One of the patches also appears to get worse after it has rained etc (even though it is on an internal wall).
Also on the other side of the wall, about 1m up the wall three wet patches have appeared (there are no salts), the patches seem to come and go, but they do not correspond to the damp patches on the reverse of the wall.
The wall is not cavity and is about 20-25 cms thick.
Has the new DPC been installed correctly?
Is salting of new plaster after a DPC/replaster normal?