A #backing #rod, also known as a #backer rod, is a flexible, cylindrical foam material đïžđ§± used in #construction joints and gaps to provide support đ ïžđ§ for #sealant or #caulk. A backer rod is typically made from open-cell or closed-cell #expandafoam, #polyurethane, or other compressible materials đ https://www.cdaets.com.au/blog..../backing-rods-choosi
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