How to waterproof retaining walls

Updated July 20, 2017

Retaining walls are often made in concrete to make them more durable or long lasting. These retaining walls can easily get soaked in water during the rainy seasons, causing the formation of mould. This is why proper sealing techniques must be done to waterproof the walls. This process will help prevent water from seeping into the walls and compromising its structure and finish. You do not want to damage your retaining walls and end up paying more than you should. Waterproofing retaining walls can be done using a few simple steps.

Use a power washer on the surface of the retaining wall. This will help prepare the wall for waterproofing and remove the loose debris, dirt and mortar.

Leave the retaining wall to dry overnight or until completely dry.

Apply waterproofing primer onto the surface of the retaining wall. Start by pouring the primer into your paint tray, then apply the primer using a long-handled paint roller to make sure the coat is even.

Do another coat of the waterproofing primer and allow it to dry for another 24 hours.

Put liquid rubber patch into the holes or cracks of the retaining wall with your paintbrush. Use your putty knife to smooth the surrounding block wall.

Apply the first coat of the waterproofing sealer onto the retaining wall's surface with a paint roller. Start by applying the sealer at the farthest corner of your wall, then use your small paintbrush to apply the sealer to edges and areas that are hard to reach.

Spread two more coats of waterproofing sealer on the surface of the retaining wall in the same method as the previous step.

Apply an even coat of concrete finishing coat on your wall with a long-handled paint roller.

Things You'll Need

  • Power washer
  • Waterproofing primer
  • Paint tray
  • Long-handled paint roller
  • Liquid rubber patch
  • Paintbrush
  • Putty knife
  • Waterproofing sealer
  • Normal-sized paint roller
  • Concrete finishing coat
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About the Author

Based in New York, Cheryl Macman has been writing health and weight loss articles since 2003. Her work has appeared in "Weight Watchers" and "Better Health" magazines. Macman holds a Bachelor of Arts in journalism from Rutgers College.