Caulk Backer Rod 5/8" × 20'

Enhance your sealant jobs with this professional-grade backer rod designed to control sealant depth, improve joint movement, and prevent three-point adhesion. Made from closed-cell polyethylene foam, it’s nonabsorbent, waterproof, and easily trimmed to fit a variety of gap sizes. Whether you’re working on pavement cracks, wall joints, foundations, or window and door frames, this versatile rod provides the perfect backing for caulk, ensuring a long-lasting, reliable seal.

Key Features

• Closed-cell polyethylene foam—nonabsorbent and waterproof
• Prevents three-point bonding for better sealant adhesion
• Easily trimmed with scissors to fit custom gap widths
• Ideal for gaps larger than ½" × ½"
• Perfect for pavement cracks, wall joints, foundations, door and window perimeters

⚠️ WARNING: This product can expose you to Carbon-black extracts known to the State of California to cause cancer. For more information, visit www.P65Warnings.ca.gov.