How to Install Concrete Block Cap Stones

Written by lisa east hunter
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How to Install Concrete Block Cap Stones
Add a capstone to the top of a block wall. (block wall image by Irina Kodentseva from

Concrete block walls provide privacy and define the areas of your exterior space, potentially separating entertaining spaces from gardening spaces. But concrete block can have a rough and unpolished appearance. Adding a concrete block capstone to the top of your block wall gives it a finished look. Adding a capstone gives a decorative touch to the wall. And if the wall is low enough, like on a planter or low patio wall, the capstone can provide seating during gardening or for entertaining.

Skill level:

Things you need

  • Dish washing soap
  • Warm water
  • Bucket
  • Scrub brush
  • Hose
  • Hose nozzle
  • Concrete adhesive
  • Caulk gun
  • Concrete sealant

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  1. 1

    Mix two tablespoons of dish washing soap with warm water. Dip a scrub brush into the solution. Scrub the top of the wall thoroughly with dish washing soap and water.

  2. 2

    Set your hose to its highest pressure setting. Hose off the wall to remove debris as well as the soap residue. Let the wall dry in the sun for about four hours.

  3. 3

    Apply concrete adhesive to the top of the wall using a caulk gun. Run the adhesive along the entire perimeter of the block.

  4. 4

    Set the concrete capstone in place on the top of the wall. Press firmly into the adhesive to secure the capstone.

  5. 5

    Apply sealant to the capstone. Choose a concrete sealant in any finish you like. Adding this layer will help protect the stone from water damage. Brush or roll the sealant onto the capstone with a clean brush. Apply three to four coats of sealant. Let each coat dry before applying the next.

Tips and warnings

  • Concrete capstones can also be stained. Choose a stain formulated for concrete. Stain the block before applying the sealant.

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