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Small-Quantity Backer Rods (1/4", 3/8", 1/2", 5/8", 3/4")

Small-Quantity Backer Rods (1/4", 3/8", 1/2", 5/8", 3/4")

Regular price $21.99 USD
Regular price Sale price $21.99 USD
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Polyethylene backer rods are backup materials for construction joints and applications requiring sealant. Our small-quantity backer rods for gaps and joints are durable and water resistant. The 1/4" backer rods are ideal for glazing installation, pre-cast units, expansion joints, and much more.

The small-quantity backer rods for gaps and joints are compatible with cold-applied sealants like urethane, silicone, and latex.

We carry various options available in 1/4”, 3/8”, 1/2”, 5/8”, and 3/4". Purchase your backer rods today.


Our backer rod is a round, resilient, extruded closed cell polyethylene backer rod with a water resistant outer skin. It is compatible with most known cold applied sealants such as urethane, silicone, acrylic, butyl, polysulfides, latex, and chinking sealants.


  • Glazing installations
  • Window and door applications
  • Expansion joints
  • Curtain wall joints
  • Partitions
  • Log construction
  • Pavement joints and repairs
  • Pre-cast units and copings


Backer Rod should be installed with a roller or blunt, flat-sided tool. Please follow sealant manufacturer specifications for recommended sealant width and depth ratio. For best results, do not puncture, fold or overly stretch the product. The product is made with a water-resistant outer skin, therefore where moisture resistance is important, care should be taken not to puncture this outer surface skin.


Joint or opening must be free of all contaminants, loose materials, dry and free of frost. Select correct rod size for joint width. With a blunt instrument or roller, seat Backer Rod to depth recommended by sealant manufacturer.


Backer Rod is chemically inert and will resist gasoline, oil, and most solvents. Product will not stain or adhere to sealants. Density: 1.3-1.9 lbs/ft3 Water Absorption: less than 0.5% by volume< 0.03 grams/cc Temperature range: -90"F to 190"F Compression Recovery: > 90% Compression Deflection: 5 psi Tensile Strength: > 29 psi Meets standards ASTM D5249 type 3 and ASTM C1330 type C

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