Tracking Basement Leaks
Traces of water on your basement floor could be caused by a leak or by condensation. To determine which, dry the area with a hair dryer and tape a 1-foot square piece of plastic wrap on the floor. Wait 24 hours. If moisture forms under the plastic wrap, then the source of your leak is outside. If not, it’s condensation.
Wall leaks may come through cracks, pipe openings or porous concrete. Traditional damp proofing will keep water out when the soil is damp, but this method often fails if the soil around your home is saturated.

Plugging Basement Leaks
Patching your foundation is effective when water pressure in the soil is low. Small holes and cracks should be sealed with a flexible caulk. Apply it with a caulking gun, and smooth your work with a wetted finger. Larger holes and cracks are best filled with hydraulic cement. The cement is sold as a powder. You mix it with water and apply it with a trowel. You can even apply it to a wet wall. A neat property of the material is that it expands as it cures, which improves your results. If possible, apply the patch to the exterior of your foundation, where it will be more effective.

Tools and materials you’ll need
1. Hammer
2. Masonry chisel - to chip out loose material
3. Wire brush and vacuum - to clean cracks
4. Spray bottle - to dampen old concrete
5. Trowel
6. Hydraulic cement or mortar patch
7. Masonry adhesive (helps patch bond to old masonry)

Pros’ Tip
Wash your tools immediately. Hydraulic cements are difficult to remove once cured.

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