Backer Rod Installation

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A backer rod is a foam cylinder that is used to fill the gaps between joints. Backer rods help maintain the integrity of a joint by providing support. A sealant is then applied over the backer rod to seal the joint. Backer rods control the depth of the sealant used in the joint, which is important since some sealants are not recommended for use past a certain depth. Backer rods range in diameter usually between a half inch to a full inch.

Things You'll Need

  • Backer rod
  • Scissors
  • Sealant
  • Groover
  • Clean the area in the joint of any possible dirt or obstructions.

  • Measure the length of your joint then cut the backer rod to appropriate length.

  • Slide the backer rod into the join until is about a half-inch below the surface.

  • Pour the sealant over the backer rod and smooth it using a groover. Allow the sealant to dry.

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