Should I Seal My Basement Floor Before I Carpet?

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You are ready to install new plush carpet in your basement. You have the carpet, padding, glue and all the other supplies you need for installation. You have one question---should you seal the basement floor before you install the carpet? Yes, you should seal the basement floor. The sealing process is not difficult and the sealer will keep any moisture out of your carpet and padding.

Moisture, Mold & Mildew

  • By properly sealing your basement floor with a waterproofing sealer, you will keep moisture out of the carpet's padding and out of the carpet itself. With the moisture removed, mold and mildew can't form. It is also important that your basement's walls are sealed and free of any cracks where moisture can also enter. No matter what material your basement floor is composed of, you need to seal it with a sealer. Make sure you cover the entire floor with a sealer like Seal-Krete Original Waterproofing Sealer or another brand. The sealer will not only seal the floor, it will bind any dust particles. Once the sealer has dried for the recommended time on the sealer's container, install your padding and carpet.

    Note, most basement floors are concrete and concrete acts like a sponge and can absorb water if not sealed properly.

Cracks & Issues With the Floor

  • If you notice any cracks or other issues with your basement's floor, repair them first with a concrete patch, crack filler or other substance before applying the sealer. If your basement floor is not concrete, still repair any issues with the floor before applying the sealer. Let the fillers and patches dry overnight before applying the floor sealer.

Tips on Applying a Sealer

  • Open all windows and doors in the basement and the area directly above the basement before you apply the sealer. Wear a nose mask and rubber gloves for protection. Start at the farthest end of the area or space and work your way toward a exit. Apply the sealer with a paint roller and follow all recommendations and instructions found on the sealer's container. Usually one coat is all that is needed. Do not walk on the sealed floor until it is dry.

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