Mutual Industries 1.25 in. x 400 ft. Closed Cell Backer Rod

Backer rod is an ideal non-absorbent compressible backup material inserted into a joint to control sealant depth. This creates a backstop to allow proper sealant tooling and proper sealant of the joint surfaces. Backer rod can also be used as a temporary joint seal.

• Nonabsorbent compressible backup material enables long-term use
• Efficiently fills large gaps and openings to avoid drafts
• Designed to provide a sound surface ideal for caulking projects