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Gave the wall a paint with the Jewson silicon waterproofer this morning and all seems good. The damp part of the plaster took it okay so all should be good with just that I think. Will see how it feels in 24/35hours when fully dry and soaked into the wall-if it works it should stop any plaster crumbling if memory serves as well as stopping the damp.
jeff80
Some times in the morning ideas don't seem so good! Occasionally the bond to the underplaster had deteriorated to the point where it crumbles off with a finger and it's just the top layer balancing on the wall, your dad would have seen this a mile off, do you really want to get into removing good plaster? Most probably not.