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I have got a penetrating damp problem in my bedroom that is due to be fixed in a week or so. My question is relating to the method the builder intends to use. He plans to remove all of the damaged/damp plaster on Day 1, then fix the problem on the outside of the house, then replaster on Day 2. My concern is that the wall will not be dried out sufficiently, as it took 4 weeks for an internal wall in another area of my house to be dried ready for plastering after flood damage last year. Am I worrying unnecessarily, or am I right to be questioning this?

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Depends on degree of damp in wall, ideally it would be prferable to leave wall exposed for months but most people would nt have the patience.
i would be more concerned bout the type of plaster going back on the wall since most modern plasters are Gypsum based and are less effective on older and damper walls.