Pre-Caulking/Chinking Backer Rod (Round, Closed Cell)



Backer rod is to be used behind chinking and caulking, in joints larger than 1/4″ wide and 1/2” deep or more, including:

  • Between logs
  • Around door and window frames
  • At foundation sill plates
  • In wall joints and cracks
  • In sidewalk and driveway cracks
  • And anywhere else you’ll use caulk

Longer rolls available to order. The sizes listed are the most common sizes that are ordered. Great for use with Log Jam chinking to save product. Can also be use for Log Builder to fill in gaps by windows.

Closed Cell Backer Rod

  • Foam material used to fill large checks and also gaps between logs. It also provides support for chinking and sealants.
  • Its primary purpose is act as a “bond-breaker” and promote two-point adhesion (see diagram). This gives the joint and sealing material the ability to compress and expand as logs move.
  • Sealants and chinking do not adhere to the rod – only to the log surfaces of the joint. This allows for movement without damaging the sealing material.

Closed cell backer rod

Most common form of backer rod is closed cell. It does not hold moisture and actually repels water.  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

Round backer rod can be used in almost every joint style except flat Appalachian 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.

Pre-caulking filler rope to use with Log Jam

Backer rod


Sahsco Log Jam Chinking

Supreme Deck Restoration

Additional information

Weight 1 lbs
Dimensions 8 × 8 × 8 in

1/4" x 100' Roll, 1/2" x 100' Roll, 3/4" x 50' Roll, 1" x 50' Roll