Before Caulking, Use Backer Rod  To Help Fill Gaps And Openings In Pavement Cracks, Wall Joints, Foundations, Sidewalks And Driveways.The Gap Filler Helps Cushion And Insulate And Helps Prevent 3-Point Bonding.
 ▪  Foam Cord/ Backer Rod
 ▪  Provides A Sound Surface For Caulking Projects
 ▪  For Filling Large Gaps And Openings
 ▪  For Use In Expansion Joints In Driveways And Sidewalks
 ▪  Moisture Resistant
 ▪  Twist Multiple Strands Together To Fill Large Cracks, Gaps
 ▪  Mfg #WS31191