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ishitintheurinal t1_jaazh3b wrote

Plaster efflorescence. It's what happens when the calcium carbonate in the finish coat gets wet. Not a DIY job. You need a plasterer to repair that.

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btribble t1_jabms9q wrote

But before that, figure out where the moisture is coming from and fix it. This looks like an upstairs wall, so I would assume it's coming from the roof. If those are stairs down to a basement the moisture could be wicking up the wall from somewhere.

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