How to Waterproof Concrete Slabs

Written by angela odum
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If your concrete slab is not sealed, you should seal your slab with waterproof sealer to help prevent it from staining or cracking. Repouring or repairing a concrete slab can be very expensive and time consuming, so you should waterproof your concrete to maintain it and prevent future problems. Waterproofing concrete is very simple and can be done in a day. However, you must wear protective gear, as the chemicals needed to waterproof the concrete are hazardous. Consult a concrete specialist to determine the best sealer for your location and project.

Skill level:

Things you need

  • Rubber gloves
  • Eye goggles
  • Face mask
  • Protective clothing
  • Paintbrush
  • Paint tray
  • Paint roller with long handle
  • Roller brush
  • Stiff brush
  • Concrete cleaner
  • Concrete sealer
  • Hose
  • Water

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  1. 1

    Put on your protective clothing, eye goggles, face mask and rubber gloves to protect yourself from the harmful chemicals you'll be using.

  2. 2

    Clean the concrete slab by scrubbing it with a stiff brush and using concrete cleaner according to the manufacturer's directions. Make sure, if the concrete is located inside, that you are working in a well-ventilated area. Once the concrete is cleaned, hose it down with water.

  3. 3

    Apply the waterproof concrete sealer according to the manufacturer's directions with a long-handled paint roller. Use a paintbrush to cut in the edges. Make sure that you work the waterproof sealer into the concrete well and that no puddles remain on the surface. Apply a thin, even coat to the entire surface of the slab and let it dry according to the directions.

  4. 4

    Apply a second coat of sealer in the same manner after the first coat has dried.

  5. 5

    Wash your hands, face and exposed skin with warm water and soap, and discard all materials that were used, excluding the paint roller. Just remove the roller brush; the paint roller can be retained for later use.

Tips and warnings

  • Make sure that you dispose of the concrete sealer and cleaner properly as these are hazardous chemicals.

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