Wet It Be! A complete guide to fixing a damp basement
April 17, 2024
"We definitely have a mildewy smell in our basement, but I’m not sure where the moisture is coming from."
- Cliff, via e-mail
Here’s a trick for figuring out whether your dampness is caused by condensation or moisture seeping in through the foundation.
Start by cutting a one-foot-square piece of foil or heavy plastic (like from a garbage bag). Run duct tape along all four sides of the square and secure the patch to the basement wall, pressing the tape firmly to seal all edges. Leave the patch on the wall for at least 24 hours. When time’s up, inspect the patch to see which side is damp.
If the side that was open to the basement air is damp, you have a condensation problem.
If the side that was next to the wall is moist, you’re getting water seepage from the outside. Proceed to next question.
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