How to Put Cultured Stone Over Brick

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Update the look of a brick wall with cultured stone facing. Siding a brick wall or a fireplace hearth will imbue any home with rustic charm. Made to imitate the look and durability of real stone, cultured stone comes in a vast variety of stone types. Install flat-backed cultured stones to sound masonry surfaces with mortar and seal the gaps between with grout. Use mortar and grout that is recommended by the manufacturer of the cultured stones.

Things You'll Need

  • Wire brush
  • Concrete and masonry cleaner
  • Scrub brush
  • Mortar
  • Notched trowel
  • Grout bag (optional)
  • Grout (optional)
  • Jointer tool (optional)
  • Concrete/stone and grout sealer
  • Paintbrush
  • Remove any crumbling bits of brick by abrading away the loosened chunks with a wire brush.

  • Scrub the bricks thoroughly with concrete or masonry cleaner to remove any contaminants that may interfere with mortar adhesion. Rinse the bricks with fresh water.

  • Mist the wall and the backs of stones with water to keep them wet when applying mortar.

  • Begin mortaring the cultured stones, starting at a top corner of the brick wall. Apply 1/2 to 3/4-inch thick layers of mortar to the brick wall and to the backs of stones, using a notched trowel. The notched trowel will embed ridges in the mortar, helping to create a stronger bond. Fit stones tightly together for groutless stone veneer walls. Space stones 3/8 to 1/2-inch apart for grouted stone walls.

  • Leave the mortar to cure for 24 hours.

  • Fill a grout bag with grout, if applying grout between stones. Use colored grout, if desired. A grout bag works much like an icing bag. Point the nozzle between stones. Squeeze the bag to extrude and move it slowly along joints to fill them with grout. Smooth down the grout joints by running over the grout with the end of a jointer tool. Quickly clean up any grout that smears onto the faces of the cultured stones with a damp sponge or rag. Allow the grout to cure.

  • Paint the stones and grout with a coat of concrete and grout, or stone and grout sealer. Apply the number of coats recommended by the sealer manufacturer.

Tips & Warnings

  • Cut stones to fit, if necessary, using a circular saw with a diamond blade or a masonry saw.
  • Grout is required for outdoor applications to prevent moisture from seeping behind stones.

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References

  • Photo Credit Jupiterimages/Comstock/Getty Images
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