How to Tape Backerboard Joints


Backer board is a type of cement board used in many household applications. It is used under flooring and tile. Backer board also can be found in bathrooms behind shower surrounds. It installs similar to drywall. This cement board is only 3-by-5 feet in size and comes either 1/4 or 3/4-inch thicknesses. The final step in the installation process of backer board is taping the joints. This taping will give it a uniform look throughout and prevent people from noticing where the pieces butt together.

Things You'll Need

  • Sponge
  • Self-adhesive tile backer board tape
  • Scissors
  • Thin set mortar
  • Trowel
  • Broom
  • Dust pan
  • Clean rag
  • Wipe the surface of the backer board clean with a damp sponge. Wet the sponge slightly and wipe up anything left over from the installation. Clean off the dust and debris, and pick up any loose screws or nails by hand.

  • Cut each of the pieces of self-adhesive backer board tape to size with scissors. Lay each piece over the seams between the sheets of backer board.

  • Apply thin set mortar over the tape. Cover the tape with the mortar using a trowel in smooth even strokes. Keep the surface level, avoiding any humps or ridges.

  • Spread out the mortar so the tape is completely covered. It is okay to get the mortar on the backer board when applying it over the tape.

  • Run your trowel over the tape after it has dried overnight to smooth out the surface. Clean off the surface of the backer board with a broom and dust pan. Brush all of the mortar that chipped off into the pan, and wipe down the entire surface with a clean rag.

Tips & Warnings

  • For interior applications, use 2-inch wide tile backer board tape. For exterior applications, use 4-inch wide tape.

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