Fix Your Foundation Before It’s Too Late

Repair Small Crevices In The Concrete Seawall That Borders Your Oceanfront Property

by Howard Barnett

If a concrete seawall bordering your oceanfront property has small crevices in the top portion of its surface, due to years of being exposed to saltwater during high tides, clean and repair the damaged areas by completing the steps below. Once the seawall's appearance has been restored, apply a coat of sealer to the wall to protect it from additional damage.

Materials Needed

  • garden hose
  • garden sprayer
  • concrete cleaning agent
  • water
  • bleach
  • scrub brushes (various lengths and thicknesses)
  • wire brush
  • tube of concrete patch
  • caulk gun
  • trowel
  • sponge
  • concrete sealer
  • paint roller
  • paint tray

Clean Both Sides Of The Seawall

Use a garden hose to fill to a garden sprayer's tank until it is almost to the top. Add a small amount of a concrete cleaning agent and bleach to the tank. Once the tank has been reattached to the garden sprayer, turn on the agitator to mix the ingredients. Apply an even coat of the cleaning solution to both sides of the wall. Use various sized scrub brushes to remove surface stains from the concrete. For instance, if you are attempting to remove dirty residue from an area of the wall that has intricate details in it, use a thin, handheld brush.

If there are loose pieces of concrete that were not removed with a scrub brush, move a wire brush back and forth over each of them to eliminate them. Rinse the wall off with water once it is stain-free and wait for both sides of the wall to dry.

Patch The Concrete

Pull the release tab on the back end of a caulk gun to open its chamber. Insert a tub of concrete patch in the tool before pressing the tab back into place. Fill each crevice in the seawall with an even amount of patch. Use a trowel to smooth out the patch. If too much of the product was applied to any of the damaged areas, remove it with a damp sponge. Wait for the patch to harden. 

Apply A Coat Of Sealer To Both Sides Of The Wall

Pour a container of thoroughly mixed concrete sealer into a paint tray. Dip a paint roller into the sealer until it has an even coat on its surface. Move the roller over the seawall's surface. Use straight strokes on both sides. Coat any small details on the seawall's surface with a paintbrush. Do not touch the seawall while the sealer is drying. Once the sealer dries, the wall will be provided with a layer of protection that will prevent the concrete from becoming damaged when it is exposed to ocean water. 

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