Join Date: Mar 2006
Location: Cape Fear, NC, USA
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Why not dry the area out before sealing it up?
As a practical matter in temperate climates it probably won't hurt to encapsulate moisture but in the North County it does not take much water to freeze and swell and so open up/crack the structure that is trying to restrain it.
Set up a tube in the space to be dryed with air flowing continuously and the moving air will carry away a lot of moisture. More air flow means quicker drying.