Insul-Joint Backer Rod is an ideal non-absorbent compressible backup material inserted into a joint to control sealant depth, creating a backstop to allow proper sealant tooling. It can also be used as a temporary joint seal. It is commonly used in glazing operation, window and door applications, expansion joints, curtain wall joints, partitions, log construction, pavement joints and repair, precast units and copings.

Insul-Joint Backer Rod is an extruded, round, closed-cell, low density polyethylene foam material with a skin-like outer texture. It is highly flexible and compressible for easy installation.