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.

• Brand Name: M-D
• Color: Gray
• Material: Polyethylene
• Product Type: Caulk Backer Rod
• Application: Driveways and Sidewalks
• Length: 20 ft.
• Thickness: 1/2 in.
• Self Adhesive: No
• Hardware Included: No
• Packaging Type: Bagged