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I live in a very old cottage (1747) some of the plaster mainly on exterior walls has blown/blistered with a powdery residue. We have hacked off the plaster - treated the walls and re-plastered but slowly it is returning. What are we not doing that we should be?

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Have you checked for structural damage that may be causing this? – BMitch Jun 18 '13 at 15:06
That could be efflorescence which is caused by moisture migration. Are there moisture issues on the exterior walls? – DA01 Jun 18 '13 at 15:12

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