Review on M D Building Products 71552 Backer by Bob Fasho

This 5/8" support rod went well with a 1/2" expansion joint. First, the old fiberboard joint was uncovered. The joint was pressure washed, followed by final cleaning with a blower. A rod of this size is perfect. It's easy to slide it about 1/2 inch below the concrete surface. fingers squeeze it well. Box knife with retracted blade ensures even depth. Five 10-ounce cartridges of Sikaflex 1cSL Flexible Self-Leveling Polyurethane Expansion Joint and Crack Sealant filled a 1/2 x 1/2 x 35 foot gap. The joint must be closed until the sealant has hardened