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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.
bluehuw-
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
I though it sounded a bit drastic too, it was just my dad ( ex engineer/builder) mentioned it so I figured it would be worth looking into.