How to Install & Apply Stucco to a Backer Board

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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

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.

References

Comments

Resources

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

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