The Tremco Soft Backer Rod – 3/8" Diameter Foam Sealant Backing Rod is a reliable joint filler designed to improve sealant performance in commercial and residential construction applications. Sold by the roll, this backer rod comes in gray and features a 3/8" diameter with a convenient 20' roll length for easy handling and installation.
Manufactured from durable polyethylene foam (closed cell), this soft backer rod acts as a resilient backing and thickness control device for elastomeric and other cold-applied sealants. When installed properly, it helps control sealant depth and promotes proper joint design. Because sealant does not bond to the backer rod, it allows the sealant to stretch and recover with joint movement while reducing stress at adhesion points.
Commonly used in glazing, expansion joints, window perimeters, curtain wall systems, and precast panels, Tremco backer rod helps improve sealant longevity and overall joint performance in demanding environments.
Please note, no returns on consumable supplies.
