How to Use Fiberglass Drywall Tape


Fiberglass drywall tape is used for covering the joints between drywall panels. The major benefit of fiberglass drywall tape is how easy it is to install. Because it is self-adhesive, fiberglass drywall tape doesn't need to be embedded in a layer of joint compound, as paper drywall tape does. But fiberglass drywall tape is more prone to cracking than paper drywall tape, so use setting-type joint compound to create a stronger surface.

Things You'll Need

  • Utility knife
  • Setting-type joint compound
  • 12-inch drywall knife
  • 100-grit sandpaper
  • Lay a section of fiberglass drywall tape over the entire length of the joint.

  • Press it onto the joint, making sure to keep it centered.

  • Cut away any loose strands or excess fiberglass tape with a utility knife. The tape should lay as flat as possible.

  • Cover the entire length of the fiberglass drywall tape with a coat of setting-type joint compound, applied with a 12-inch drywall knife. Feather the edges and leave the surface as smooth as possible.

  • Allow the joint compound to dry according to the product directions.

  • Sand the dried joint with 100-grit sandpaper. Apply another coat of compound to the joint if the surface is still not smooth. Let the compound dry, then sand it.

Tips & Warnings

  • Avoid using fiberglass drywall tape for interior angles. It will not form a sharp corner and may eventually crack.

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