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Per ANSI/IICRC S500 Standards and Reference Guide.
"Restorers should consider drywall restoation when it can e verified that no structural integrity has been lost. Dywall can be restoragle if the water is Category 1 or 2, there is no obvious swelling, seams are intact, and there is no idication of fungal growth. Drywall should be replaced when contaminated with Category 3 water, damage is obvious (e.g., swelling, seam sagging, seperation), fungal growth is present on paper coverings on either side, or when blown-in insulation materials behind the drywall have likely packed down."
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