How to fill in gaps in a brick patio

Updated February 21, 2017

Brick patios are ideal for enjoying the outdoors, providing a solid surface off the grass to relax and cook out. Brick patios are laid over compacted sand and held in place by rubber edging and mortar. These patios are typically installed by excavating the grass and topsoil, then laying sand and gravel, followed by concrete mortar. Over the course of time, bricks in the patio can shift, causing the mortar to crack or bricks to come loose. Fixing these problems is a straightforward process.

Sweep off the brick patio with a broom, and vacuum up any loose mortar chips, using a crevice attachment. Get out any debris to have a clean, empty surface to work with.

Fill a gallon jug with water. Mix three parts masonry sand with one part cement in a bucket, wet it with the water and stir it with a trowel.

Pour concrete bonding agent into the gap where the mortar has broken away, and then fill the gap with wet cement. Use a trowel to even out the cement and scrape up any excess. Let the cement dry for 24 hours before you walk on the brick patio.

Repeat Steps 1 thorough 3 as necessary for additional gaps between bricks.

Sweep the patio around the missing bricks, and sweep in the empty space where the brick was previously located. Vacuum out the empty space with a crevice tool to get up all the particles.

Combine one part cement with three parts sand in a bucket, then fill an empty jug and moisten the dry ingredients. Mix them together with a trowel until they're well-blended.

Pour bonding agent into the empty space, and then use the trowel to spread an even layer of wet cement in the gap.

Place a brick in the empty space, pressing it down into the wet cement. Use the trowel to fill the gaps around the brick with wet cement. Allow the cement to dry for a period of 24 hours before you use the brick patio again.

Repeat Steps 1 through Step 4 as needed to replace any other missing bricks in the patio.

Things You'll Need

  • Broom
  • Vacuum
  • Gallon jug
  • Masonry sand
  • Cement
  • Bucket
  • Trowel
  • Concrete bonding agent
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About the Author

Owen Richason grew up working in his family's small contracting business. He later became an outplacement consultant, then a retail business consultant. Richason is a former personal finance and business writer for "Tampa Bay Business and Financier." He now writes for various publications, websites and blogs.