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The Rip-OffIf your basement is chronically wet, unscrupulous contractors might tell you they need to dig out your entire foundation and waterproof it, for anywhere from $5,000 to $15,000. More often, though, the solution is simple and costs very little.
The Reality
Many basement leaks are caused by overflow from clogged gutters, misrouted downspouts, unsloped land around the house or even improperly aimed lawn sprinklers.
"Think of your masonry foundation as a rigid sponge," explains waterproofing expert Richard Barako. If the water volume is above normal, water will wick through the cinder blocks. So before calling in professional help, try to reduce the moisture along the foundation by cleaning gutters, rerouting downspouts, repositioning sprinklers, or packing fresh soil six inches high against the foundation and sloping it back to level within about three feet.
Damp walls may be caused by high humidity. To test, attach a piece of aluminum foil to the foundation wall; if moisture shows up on the patch in a day or two, it's just condensation. Start shopping for a dehumidifier.
If water is still seeping in, repair any cracks with hydraulic cement, available at home stores, and apply a quality waterproof paint such as Latex Base Drylok Masonry Waterproofer. As a last resort, consider hiring a professional engineer, whose impartial advice would be worth the expense. Home inspectors are less expensive, but be sure they're certified by the American Society of Home Inspectors.
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