How to Install & Apply Stucco to a Backer Board

Stucco is a mortarlike coating applied to a house’s exterior to create a strong, long-lasting, weather-resistant coating that can be painted or allowed to weather naturally. While stucco can be applied directly to many surfaces, for maximum durability a specially designed backer board is usually installed against the existing wall.

Things You'll Need

  • Tape measure
  • Utility knife
  • Power screwdriver with Phillips-head bit
  • Coated backer-board screws
  • Cement bonding agent
  • Stucco
  • Bucket
  • Finishing trowel
  • Plasterer’s rake
  • Brush or sponge

Instructions

    • 1

      Measure and cut backer board to fit the application. Score the backer board with the utility knife, place the scored line on a hard, straight-edge surface, such as the edge of a board, and push to snap off. Finish cutting the paper backing with the knife.

    • 2

      Attach the backer board with backer-board screws and a power screwdriver. For exterior walls, install backer board over foam-sheet insulation. Make certain the screws go at least ½ inch into the wall, past the board and sheet insulation.

    • 3

      Apply a cement bonding agent to the backer board and allow to dry according to the manufacturer's instructions.

    • 4

      Mix the stucco according to the manufacturer's instructions and apply a primary “scratch” coat with a trowel. Work in a straight line, one wall at a time, to minimize lines. Allow it to harden slightly and finish by smoothing with a plasterer’s rake. Allow the scratch coat to cure for 48 hours.

    • 5

      Dampen the scratch coat and apply final ¼-inch-thick finish coat with the finishing trowel. Texture as desired with a brush, sponge or trowel. Allow at least six weeks before painting.

Related Searches

References

Resources

  • Photo Credit window against white stucco wall image by Bo Widerberg from Fotolia.com

You May Also Like

Related Ads

View Blog Post

DIY Himmeli-Style Christmas Star Tree Topper