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How to dry damp walls
Locate and fix any water leaks near your wall.
If a broken water pipe, faucet, or similar fixture led to the moisture damage in your wall, you'll need to fix the busted object before you can dry everything out. To deal with minor pipe damage, try resealing the pipe with epoxy putty.
For major pipe damage and broken water appliances, you may need to strip out and replace the fixture entirely. For safety, hire a professional pipe repair service to deal with leaks located inside your wall.