When does wet drywall need to come out?
Often, if the water was sewage or outdoor flood water. The CDC says to remove and discard drywall and insulation contaminated with sewage or floodwater. Clean supply water on a small area can sometimes be dried if you catch it inside 24 to 48 hours. A moisture reading on the wall tells you more than a guess.
On this page
The EPA says mold can grow on drywall that stays wet for more than 24 hours, and it lists the back side of drywall as a place mold can hide.
When the CDC says to take it out
The CDC cleanup page says to remove and discard drywall and insulation that has been contaminated with sewage or floodwater. If outdoor flood water or a sewer backup reached the wall, the CDC's instruction is to take that drywall out.
The EPA flood-cleanup page says mold can grow on drywall if it remains wet for more than 24 hours, and it tells you to throw away anything you cannot clean and dry.
When drying in place might still be possible
A clean supply leak that you catch early is the narrower case. The EPA mold guide says that if wet materials are dried within 24 to 48 hours, mold will not grow in most cases. A small splash on painted drywall that you dry the same day is the kind of job people try to save. A soaked pad behind a baseboard, or water that wicked a foot up the paper face, is harder to call without opening the wall.
A crew that wants to leave wet drywall in place should show you a moisture reading. How soon mold can start is the reason that reading matters.
How the wall is usually opened
Ask the crew whether they will pull the baseboard first to reach the bottom of the wall. The CDC says insulation contaminated with sewage or floodwater comes out with the drywall. What to do when water is in the house puts that step after the power is safe and the standing water is gone.
If you are in Eau Claire, that page lists the city's 2026 fees for alterations and repairs.
Sources
Who wrote and checked this page
- Written by
- Soaked SOS editorial staff. Who runs this site
- Facts checked
- , by the Soaked SOS editorial staff, against the sources listed on this page.
- Licensed professional
- None. No licensed restoration contractor or industrial hygienist has checked this page.
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