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. Fills large gaps and openings to prevent drafts Easily trimmed to size with scissors Provides a sound surface for caulking projects For use in expansion joints in driveways and sidewalks Sold by the foot or by roll (prices vary depending on the size)