Closed Cell Backer Rod

Closed Cell Backer Rod foam is used to fill large checks between logs and provide support for chinking & sealants. Its primary purpose is act as a "bond-breaker" and promote two-point adhesion, giving the joint and sealing material the ability to compress and expand as logs move.
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From $16.05
By Sashco

Closed Cell Backer Rod is a foam material used to fill large checks and gaps between logs. It also provides support for chinking and sealants. Backer Rod 2 Point Adhesion


Its primary purpose is act as a "bond-breaker" and promote two-point adhesion (see diagram), giving the joint and sealing material the ability to compress and expand as logs move.

Sealants and chinking do not adhere to the backer rod - only to the log surfaces of the joint - allowing for movement without damaging the sealing material.

Closed cell backer rod is probably the most common form of backer rod. It does not hold moisture and actually repels water. Closed cell backer rod comes in a variety of sizes ranging from 1/4" to 5” wide and can be used on both the exterior and interior of the home.

Round backer rod can be used in almost every joint style except flat Applachian style logs. The round nature of the backer rod allows the caulking / chinking to adhere well to the wood, while the slightly thinner layer in the center allows the material to move with the logs. This also makes it so that any failure due to extreme movement will generally split down the middle of the bead line, allowing for an easy fix.

Product Questions

  • Do I need to use backer rod in all caulk lines and cracks? Some of my cracks are pretty large and I know those need to be filled but was just wondering about the smaller ones.

    Backer rod is definitely used in large cracks or checks to fill the void before caulking. But if your cracks are very small and downward facing, it's not necessary to fill them with backer rod. Energy Seal is very elastic and will do an excellent job with either application.

DETAILS

Closed Cell Backer Rod is a foam material used to fill large checks and gaps between logs. It also provides support for chinking and sealants. Backer Rod 2 Point Adhesion


Its primary purpose is act as a "bond-breaker" and promote two-point adhesion (see diagram), giving the joint and sealing material the ability to compress and expand as logs move.

Sealants and chinking do not adhere to the backer rod - only to the log surfaces of the joint - allowing for movement without damaging the sealing material.

Closed cell backer rod is probably the most common form of backer rod. It does not hold moisture and actually repels water. Closed cell backer rod comes in a variety of sizes ranging from 1/4" to 5” wide and can be used on both the exterior and interior of the home.

Round backer rod can be used in almost every joint style except flat Applachian style logs. The round nature of the backer rod allows the caulking / chinking to adhere well to the wood, while the slightly thinner layer in the center allows the material to move with the logs. This also makes it so that any failure due to extreme movement will generally split down the middle of the bead line, allowing for an easy fix.

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PRODUCT QUESTIONS

Product Questions

  • Do I need to use backer rod in all caulk lines and cracks? Some of my cracks are pretty large and I know those need to be filled but was just wondering about the smaller ones.

    Backer rod is definitely used in large cracks or checks to fill the void before caulking. But if your cracks are very small and downward facing, it's not necessary to fill them with backer rod. Energy Seal is very elastic and will do an excellent job with either application.