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How do I Repair Damp Spots in Concrete Walls?

Updated February 21, 2017

Damp spots in concrete walls can be the cause of the growth of mildews and moulds. When your concrete walls are near shady and damp areas, the exterior of your house may have to deal with the presence of spores. This can be addressed by properly cleaning the walls with the right tools and materials, and repairing your concrete walls. You can fix the damp spots in your concrete walls in just a few easy steps. You can save a lot of money by knowing how to repair them yourself.

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  1. Allow the damp spots on your walls to dry. If your concrete walls are at the basement of your house, open the door and windows to ventilate the area and pull the air out. Place your dehumidifier near the wall and run the fans and the device until your wall is thoroughly dry for two to three days.

  2. Use your shop vacuum and vacuum your entire wall. Take your dry scrub brush and use it to scrub the entire wall with hot water and some detergent.

  3. Rinse the wall using clean water and dry it with disposable towels. Put the used towels in a plastic garbage bag for easier disposal.

  4. Re-vacuum your wall after scrubbing to remove all the loose spores and mildews created that grew from the damp spots.

  5. Disinfect the walls with a mixture of 1 gallon of water and ½ cup of bleach. Allow the walls to dry for a full 24 hours.

  6. Apply one coat of clear concrete sealer in order to prevent the damp spots from returning. Locate the leaking pipes as well as other sources of water and repair them if necessary. Dispose your trash bag and leave the sealer to dry for at least 24 hours.

  7. Tip

    To avoid any form irritation to your nasal passages and lungs, wear your dust-filtering mask while doing the cleaning and repairs.

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Things You'll Need

  • Dehumidifier
  • Shop vacuum
  • Dry scrub brush
  • Water
  • Detergent
  • Disposable towels
  • Plastic garbage bag
  • ½ cup of bleach
  • Clear concrete sealer

About the Author

Based in New York, Mary Gonzales has been writing computer- and technology-related articles since 1995. Her work has appeared in “Tech Trends” and “Mac Tips” magazines. Gonzales received the Lilly M. Fuchs Literary Award in 1999. She holds a Bachelor of Science in computer programming from New York University.

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