If water is getting into your wall from rain, a sprinkler that’s too
close to your house, or even from a plumbing leak you’re likely to see
patches of damage on your walls near the spot of the intrusion. That’s
because drywall has a paper backing, so when it gets wet, it can bubble
and wrinkle, sort of like a sheet of paper does.
To diagnose the problem, place a four-foot level across the damaged area
and learn how much the sheetrock has sagged. If it’s more than about
3/8 of an inch, the structural integrity of the drywall is probably
ruined and the section should be replaced.
If no sagging has occurred, use an awl to randomly push into the
sheetrock. You should feel substantial resistance, and the awl shouldn’t
be able to penetrate the sheetrock any more than 1/8 of an inch without
excessive force. However, if the awl goes through the sheet rock much
deeper than 3/16 of an inch, consider replacing the section.
Read more...
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