Backer Rod & Foam Gasket Tape

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Closed-cell foam backer rod is used behind chinking and caulking. Foam backer rod is essential for creating the ideal joint design. The backer rod is used to provide backing for 2-point adhesion to sealants such as caulk or chinking. Backing controls how deep the joint is, which is what lets the sealant stretch instead of tearing. Size it with the caulk, chinking and backer rod calculator . For why the rod matters at all, Log Home Chinking 101 walks through joint design and what happens to a sealant with nothing behind it. The sizing rule for the rod against the gap, and why it goes behind both caulk and chinking, is in Caulk vs. Chinking vs. Backer Rod .