How To Install Backer Board For Wall Tile

How to Install Backer Board for Wall Tile

Installing backer board is a crucial step in wall tile installation. Backer board provides a stable and waterproof base for the tile, ensuring its longevity and preventing moisture damage. Here are the essential aspects of backer board installation:

Materials and Tools Required:

Backer board (cement, gypsum, or foam)
Thin-set mortar
Backer board screws (1-1/4 inches or 2-1/2 inches)
Screw gun
Measuring tape
Level
Notched trowel
Safety glasses
Respirator

Step 1: Prepare the Surface

Inspect the wall surface for any unevenness or imperfections. Use a level to ensure flatness. If necessary, level the surface using a leveling compound or self-leveling underlayment. Ensure the surface is dry, clean, and free of dust before installing the backer board.

Step 2: Cut and Measure the Backer Board

Measure and cut the backer board to fit the wall space. Use a utility knife for cement or foam backer board, and a saw for gypsum backer board. Leave a 1/4-inch gap around the edges of the backer board for expansion. Stagger the joints between different pieces of backer board by at least 6 inches.

Step 3: Apply Thin-Set Mortar

Apply a thin layer of thin-set mortar to the wall surface using a notched trowel. The thickness of the mortar should match the size of the notch on the trowel. Spread the mortar evenly, ensuring complete coverage.

Step 4: Install the Backer Board

Place the backer board onto the thin-set mortar and press it firmly into place. Use a level to ensure the backer board is level both horizontally and vertically. Align the backer board edges carefully to maintain the 1/4-inch gap.

Step 5: Screw the Backer Board

Drive the backer board screws into the studs through the backer board at intervals of 6 to 8 inches. Use 1-1/4-inch screws for cement backer board and gypsum backer board. For foam backer board, use 2-1/2-inch screws. Ensure the screws are slightly recessed below the surface of the backer board.

Step 6: Tape the Joints (for Cement or Gypsum Backer Board)

For cement or gypsum backer board, seal the joints between the panels using alkali-resistant mesh tape and thin-set mortar. Embed the mesh tape into the mortar and allow it to dry completely. This step is not necessary for foam backer board.

Step 7: Allow to Cure

Allow the thin-set mortar to cure completely before tiling. The curing time varies depending on the type of mortar used. Refer to the manufacturer's instructions for the specific curing time.