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How to Waterproof Concrete Brick

Ask This Old House mason Mark McCullough explains and demonstrates the benefits of waterproofing concrete brick


  1. Pour the waterproofing agent into the bucket.
  2. Dip the paint roller into the waterproofing agent and apply it generously to the brick, bottom to top.
  3. The agent will cure in 14 days.

Mark applied Siloxane 20 solvent-based water repellant, manufactured by Umaco.

Expert assistance for this segment was provided by MJM Masonry.