CRL 5/8 in Closed-Cell Backer Rod 100 ft Roll – Foam Sealant Backing

• Easy control of sealant application thickness
• Non-bonding surface – no additional bond breaker required
• Compatible with all cold-applied sealants

CRL Closed Cell Backer Rod (SKU: EF58C) is a round, flexible polyethylene foam backer rod with a durable exterior skin. Designed for expansion and control joints, this closed-cell backer rod controls sealant depth, prevents excessive sealant use, and promotes the preferred hourglass sealant profile. Its non-bonding surface prevents sealant adhesion to the back of the joint, improving movement capability and extending sealant life.

Available sizes: 1/4" to 2" (7 to 50 mm) diameters.

Key benefits / differentiators: closed-cell polyethylene construction (won’t absorb or wick water), skin surface for consistent installation, compatible with most cold-applied sealants, promotes hourglass sealant shape to reduce stress at adhesion points.

Temperature limits: -45°F to 160°F (-43°C to 71°C).

Common applications: expansion and control joints in curtain walls, precast panels, parking decks, door and window frames, coping, floor and deck joints, horizontal traffic joints, and building rehabilitation projects.

Size selection: Choose a backer rod 25–50% larger than the joint width for a tight, compressive fit so it properly controls sealant depth and acts as a bond breaker.

Storage: Store in a well-ventilated area out of direct sunlight. Keep away from heat sources and open flames.

Joint preparation:

• New joints: Remove form-release agents, curing compounds, and debris. Ensure joints are clean and dry.
• Repairing old joints: Remove old sealant or filler. Use wire brushing and air blasting; if using compressed air, employ moisture and oil traps.

Installation instructions:

1. Follow the joint preparation steps above.
2. Measure and select the correct backer rod size based on joint width.
3. Install the backer rod to the depth recommended by the sealant manufacturer so the sealant forms an hourglass profile.
4. Use a blunt tool or roller for installation. Recommended tools: Cat. No. T607CU605 or Cat. No. SBRR for smooth placement.

Warnings: Do not tear, puncture, crease, over-compress or stretch during insertion. Use the correct size for each application. Do not use with hot-applied sealants or hot melt adhesives with surface temperatures above 160°F (71°C). Refer to the size selection chart.

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