How to Waterproof a Brick Wall

Written by lisa wampler
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How to Waterproof a Brick Wall
Brick will allow water to weep into the basement from the outside. (Jupiterimages/Photos.com/Getty Images)

As water runs into the ground, it travels toward low ground. If your home happens to be within that path, the groundwater will run past and likely through the foundation of your home. This can cause moisture inside your basement. One way to combat moisture in the basement is to waterproof the brick walls of your foundation. Fortunately, for mild to moderate moisture, the process is straightforward and should only take a weekend to complete.

Skill level:
Moderately Easy

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Things you need

  • Dehumidifier
  • Drain hose
  • Bucket
  • Metal bristle brush
  • Rag
  • Waterproofing paint
  • Paint roller
  • Painter's pole

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Instructions

  1. 1

    Place a dehumidifier in the middle of the basement, secure a drain hose to the hose port on the dehumidifier and place the other end of the hose into the basement floor drain. Run the dehumidifier until the basement is at or below 45 per cent humidity.

  2. 2

    Fill a bucket with hot soapy water. Use a mild dish soap.

  3. 3

    Scrub the brick walls with a metal bristle brush wetted with the soapy water. This removes loose dirt, calcium and decayed brick from the wall. This process can take some time depending on how dirty and corroded the wall is.

  4. 4

    Wipe the wall down with fresh warm water to remove any soap residue. Allow several hours for the surface of the brick to dry.

  5. 5

    Pour a quality foundation waterproofing paint into a paint tray and slide a lamb's wool roller onto your painter's pole.

  6. 6

    Apply one coat of the waterproofing paint onto the surface of the brick. Roll the paint in a X pattern overlapping the strokes to ensure adequate coverage. Wait 24-hours for the paint to dry and then add a second coat of paint to the wall.

  7. 7

    Wait until you are expected to have at least three days of dry weather. This will help lower humidity levels in the basement.

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