7/8" Closed Cell (Hard) Backer Rod (850'/box)

Overview

Closed Cell Backer Rod is a dependable solution for controlling sealant depth and improving joint performance in concrete, masonry, glazing, and construction applications. Manufactured from resilient closed-cell polyethylene foam, it resists moisture absorption while providing a firm backing surface that helps create the ideal hourglass-shaped sealant profile for maximum flexibility and adhesion. Lightweight, flexible, and easy to install, Closed Cell Backer Rod reduces sealant consumption, supports proper joint design, and helps extend the life of expansion and control joints. Its non-gassing construction makes it compatible with many cold-applied sealants, making it a reliable choice for commercial, industrial, and residential projects.

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