Durable, Weather-Resistant Backer Rod for Concrete & Home Projects Our high-quality foam backer rod is crafted from durable, weather-resistant materials designed to deliver long-lasting performance in both indoor and outdoor applications. Its flexible, round-foam construction compresses easily while maintaining the firmness needed to create a reliable seal—making it ideal for filling concrete cracks, expansion joints, and gaps around the home. Reliable Gap Filler for Caulking & Draft Prevention Use this dependable foam filler to establish a solid base before applying caulk, ensuring improved adhesion and long-term resilience. It seals gaps tightly to prevent drafts, dust, and moisture from entering your home. Whether you’re repairing old, cracked caulk or addressing new openings, this cost-effective backer rod helps reduce the amount of sealant needed while delivering a cleaner, more professional finish. Customizable Lengths & Sizes for Any Project Available in multiple diameters, this foam rope can be easily trimmed with scissors or a blade to match your project’s exact needs. Twist multiple strands together for larger openings, or use single lengths for standard cracks. It’s perfect for concrete and asphalt joints, driveway and sidewalk expansion gaps, wall seams, window and door frames, and countless other applications.Wide Sealant Compatibility – Works with most cold-applied sealants, including urethane, silicone, acrylic, butyl, polysulfides, latex, and log home chinking sealants. Fast, Effortless Installation Installation is simple: clean the area, press the foam rod uniformly into the gap, and apply your preferred caulk or sealant over the top. The foam seats snugly, stays in place, and helps you achieve a smooth, uniform finish—no messy adhesives needed. Versatile Beyond Construction while excellent for professional sealing and insulation tasks, this foam is also useful for DIY and creative projects. Use it for weatherproofing, damp-proofing, insulating gaps, supporting cropped dog ears during training, creating craft pieces, ring holders, and more. Complies with ASTM C 1330, Type C

Backer Rod is a closed cell, resilient, polyethylene backer rod used as a backup material for construction joints and applications that require sealants. It performs as a depth control for most known cold applied sealants. Sealants will not adhere to it; no bond breaker is required. Composition and Materials: 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. Specific Uses Include: Expansion joints Highway joints Glazing Log home chinking Parking Decks Curtain Walls Coping joints Isolation joints Temporary joint seal Limitations: 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. Installation: 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. Technical Data: 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