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What You Need to Know about Sealing Foundation Leaks

What You Need to Know about Sealing Foundation Leaks

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August 8, 2007

Sealing foundation leaks on the inside of your basement is not a daunting task. You need to trace the source of the leak. Once you locate this, determine the seriousness of the problem. If it is simple and the result of a crack, you will be able to repair it without problems. If, however, the leak is traced to the exterior foundation, you might have to call in a contractor.

A leaking foundation is often the result of a crack in the interior basement wall. Once you locate the crack or cracks, you can begin the process of sealing foundation leaks. In order to do this, you will require some basic tools. A stiff-bristle brush is essential. A hammer drill may be necessary if the crack is large. A trowel is also helpful in the case of larger or deeper cracks.

Sealing Foundation Leaks

If the crack is small, the job is simple. In sealing foundation leaks of this nature, you take the brush and clean away any dust, grease and dirt. Make sure you are thorough. Be sure, remove any signs of paint. An interior cement-based sealer works only on bare cement.

Once the crack is clean, you can proceed in sealing the foundation leaks. Thoroughly wet the wall. Mix the components of the cement-based sealer according to the given instructions. Apply it to the crack with a stiff brush, making sure you fill in all the pores. Repeat the process several times if necessary to fill all crevices.

If the hole is larger, the process for sealing foundation leaks differs somewhat. Take a hammer drill and reshape the hole so the bottom end off the crack is wider than its top. Fill it first with hydraulic cement. Take a trowel, if the patch is quite large or use the brush method to fill in the hole. Follow the instructions on the package to ensure the correct consistency.


When you have filled the hole with sealant, you may not be finished with sealing foundation leaks. Some sealants require wetting for several days. This means, you must keep the material damp to ensure bonding. There is also the possibility you may have to apply a second coat of sealant. Check the directions on the package of sealant and talk to your supplier to ensure you are performing the task correctly. If you follow directions this should put an end to your interior leaking basement. If it continues to leak, you will have to reconsider the problem.

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