The MD Building Products 5/8 in. x 20 ft. Gray Caulk Backer Rod for Gaps and Joints acts as a filler in large gaps before applying caulk. It insulates as well as cushions. Use in pavement cracks, wall joints and foundations. Backer rod is easily trimmed to size with scissors.
- Fills large gaps and openings to prevent drafts
- Provides a sound surface for caulking projects
- Recommended for use in expansion joints in driveways and sidewalks
- Easily trimmed to size with scissors
- Multiple strands of cord can be twisted together for extra-large gaps







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