Caulk Backer Rod, 20-ft. X 1/2-in.

Discover 20‑Foot Closed‑Cell Polyethylene Backer Rod, the ideal pre‑seal solution for expansive joints and wide openings. Crafted from resilient non‑absorbent foam, this 1/2‑inch diameter rod slides effortlessly into cracks up to 20 feet long, providing a stable backbone before you apply your favorite sealant. Its smooth surface resists moisture, ensuring a clean bond and eliminating the risk of three‑point adhesion failures.

Why Choose This Foam Backer? By installing the rod first, you create a uniform cavity that reduces material waste and guarantees a consistent sealant depth. It speeds up your workflow, eliminates gaps that could lead to cracking, and extends the lifespan of the finished joint.

• Closed‑Cell Construction: Prevents water absorption and maintains shape under pressure, perfect for waterproofing projects.
• 1/2‑Inch Diameter & 20‑Foot Length: Covers long seams without needing multiple pieces, saving time on large‑scale jobs.
• Non‑Absorbent Polyethylene Foam: Offers superior resistance to chemicals and UV exposure for outdoor applications.
• Pre‑Caulking Gap Filler: Ideal for joints larger than ½‑by‑½ in, ensuring optimal sealant thickness and performance.
• Reduces Three‑Point Bonding: Creates a single‑point contact that enhances sealant adhesion and prevents premature failure.

Ready for Professional Results: Whether you’re sealing a deck, window frame, or industrial expansion joint, this backer rod delivers dependable support that keeps your caulking smooth and durable. Choose this reliable foam core to streamline your project, protect against moisture intrusion, and achieve a flawless finish every time.