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Old 06-19-2008, 09:48 AM   #1
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Exterior Gypsum sheathing


My 1970's vintage brick ranch house was sheathed with a gypsum product. Due to a leaking tiled shower the bottom 18 inches of the backside of the shealthing had some mold. I cleaned the mold. Now the paper backing has peeled from the gypsum.

I realized replacing the sheathing would be the ideal. I am trying to avoid that at all costs.

Do I need to seal the gypsum before I insulate?

If I need to seal it how do I do that?

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Old 06-19-2008, 01:39 PM   #2
Mold!! Let's kill it!
 
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Exterior Gypsum sheathing


If the gypsum is basically intact, but has only lost the paper facer, I would seal it with Kilz. You should really test it for moisture content first, to make sure it has completely dried. If you can beg or borrow a moisture meter, test it and compare your reading to a known dry sample of the same material close by.

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