Closed Cell Backer Rod

3M 5200 Marine Adhesive Sealant
OSI SF450 Construction Adhesive Caulk

Closed Cell Backer Rod

Backer rod is a cylindrical piece of foam material installed in a gap or joint between building materials to provide a substrate for caulk or other building sealant. The backer rod ensures that the sealant maintains a proper “hour glass” shape after application, and prevents three-sided adhesion, which is important for the sealant’s ability to maintain its bond while remaining flexible.

For gaps that are 3/16″ -1/4″, use a 3/8″ backer rod.
For gaps that are 1/4″ – 3/8″, use a 1/2″ backer rod.

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  • Additional information
  • Installing Backer Rod

Additional information

Options

3/8″ x 1400′, 1/2″ x 800′, 1/2″ x 2500′

Backer rod should be installed at a consistent depth along the length of the joint, and the depth at which the backer rod is installed should ensure that the depth of the final sealant application is half the width of the joint.

For gaps that are 3/16" -1/4", use a 3/8" backer rod.
For gaps that are 1/4" - 3/8", use a 1/2" backer rod.

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