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Backer Rod - 3/4" Mini-Carton (400 ft.)

Product Code: WCSBR34CC

Price: $42.95

Backer Rod is an easy to compress, rope-like celled polypropylene / polyolefin based foam. It is inserted into a clean joint at the required depth before adding caulk / sealant. Backer Rod creates an even depth and supports (back stops) the sealant / caulk allowing it to form the proper shape (about 2x as wide as deep) and also prevents 3 sided adhesion (bond breaker). It is especially important to use it with Self Leveling Expansion Joint Sealants. Very large and Soft Backer Rods are also used for filling gaps and for sealing in general construction.



  • High moisture environments
  • Ground based expansion joints
  • General purpose sealant backing
  • Use together with self-leveling sealant
  • Highway joints
  • Parking garages
  • Around perimeters of door and window frames
  • Coping and glazing joints
  • Log Home chinking
  • Isolation joints
Round, black (charcoal), firm, resilient, polyethylene extruded closed celled foam with a water resistant outer skin. Color may be charcoal or gray, and is NOT SELECTABLE. Provides controlled depth for sealants. Compresses up to 50% in smaller sizes and 30% in large sizes. D oes not stick to sealants. Exceeds ASTM standards for bond breakering materials. No bond breaker is required. Very high moisture resistance. Will not absorb ground water. Compatible with all know types of sealants including butyl, polyurethane, silicones, tri-polyimer, polysulfide, acrylic, etc.



  • Joint or opening should be clean and dry and free of all contaminates, loose materials, dry, and free of water or frost.
  • To install, compress backer-rod into the joint before sealants are applied. Install backer-rod using a blunt tool or a plain faced roller.
  • Force the rod to the depth recommended by sealant manufacturer, (typically about 1/2 of joint width measured at the crown of the backer rod). A template or roller gauge may be used to control the depth at which the rod is placed.
  • Don't stretch, puncture or tear backer-rod during installation but gently force into the joint so that the backer-rod fits tight against the sides of the joint.

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Dimensions: 3/4" dia. closed cell foam
Qty. Quantity in Cart: None

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Backer Rod - 3/4

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