Backer Rod & Foam Gasket Tape

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.

Closed-cell foam backer rod seated behind a sealant bead in a log joint