Before caulking, use the MD Building Products 1/2 in. x 20 ft. Caulk Backer Rod to help fill gaps and openings in pavement cracks, wall joints, foundations, sidewalks and driveways. The backer rod helps cushion and insulate and helps prevent 3-point bonding.
- Fills gaps and openings in pavement cracks, wall joints, foundations, sidewalks and driveways
- Non-absorbent, closed-cell polyethylene pre-caulking material
- Twist multiple strands together to fill large cracks, gaps
- Gray finish







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