M-d Gray Foam Backer Rod — 20 Ft For 5/8 In Gaps & Joints

Introducing the gray foam backer rod from M-D Backer Rod, provided as a 20‑foot roll designed for large 5/8 in. gaps and joints. This pliable, closed‑cell foam creates a stable base for caulking, helping prevent caulk waste in deep openings while delivering a neat, durable seal. Suitable for both indoor and outdoor projects, it cuts easily with scissors for a precise fit.

Why this matters: Using a proper backing improves caulk performance, reduces waste, and shields the home from drafts, moisture, dust, and insects. It fills the space before sealing, promoting smoother bead formation and longer-lasting results. When you're ready, simply trim to length and place in the joint before applying sealant.

• 5/8 in Gap Compatibility: Specifically sized to fit large openings, delivering a stable backing for caulk and reducing waste in joints.
• Improved Caulk Performance: Provides a consistent backing that enhances adhesion and bead control for higher-quality sealant results.
• Indoor & Outdoor Use: Resilient foam stands up to temperature changes and exposure, making it suitable for inside walls and exterior surfaces.
• Easy to Trim & Install: Cut to length with scissors and press into place for quick, clean setup before caulking.
• Draft, Moisture & Insect Barrier: Helps seal gaps to keep drafts out and protect the home from moisture, dust, and pests.

Smart Choice for a Superior Seal: Engineered for large joints, this gray foam backer rod provides dependable backing for caulk, delivering a tighter and longer-lasting seal. It remains lightweight and easy to position, making fast work of weatherproofing projects. Ideal for both renovations and new construction, it protects your space from drafts, moisture, and pests with lasting performance.