How to Waterproof Masonry Walls

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Water can damage a masonry wall's sturdiness, so it is important to take steps to add protection before that happens. Making a masonry wall waterproof is not difficult, and will save you countless time, frustration and expense by keeping water out in the first place.

Things You'll Need

  • Wire brush
  • Mauriac acid
  • Rubber gloves
  • Long-sleeved shirt
  • Eye protection
  • Fast-setting hydraulic cement
  • Stiff bristle brush or roller
  • Masonry waterproofing paint
  • Prepare the surface by removing any paint chips, loose cement and salt deposits (you can spot salt deposits because they look white and powdery). Use a wire brush to remove the salt deposits.

  • Clean the area with Mauriac acid. Wear rubber gloves, a long-sleeved shirt and eye protection when you apply the acid.

  • Use a fast-setting hydraulic cement to patch holes and cracks in the masonry.

  • Apply the first coat of masonry waterproofing paint to the wall and joint, using a stiff bristle brush or roller. Thoroughly work the paint into the joints.

  • Apply a second coat of masonry water proofing paint, then clean up the work area.

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