CRL 1/4 in Closed-Cell Foam Backer Rod 100 ft Roll

• 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: EF14C) is a round, flexible polyethylene foam backer rod with a sealed exterior skin. Designed for expansion and control joints, it controls sealant depth, promotes the preferred "hourglass" sealant profile, and prevents excessive sealant use. Its non-bonding surface lets elastomeric and other cold-applied sealants move and flex, reducing stress at adhesion points and improving long-term joint performance.

CRL Closed Cell Backer Rod is available in diameters from 1/4" to 2" (7 to 50 mm), ideal for joint sealing in curtain walls, precast panels, parking decks, door and window frames, coping, floor and deck joints, horizontal traffic joints, and building rehab projects.

Key benefits:

• Will not absorb or wick water to joint walls—reduces risk of adhesive failure
• Round shape promotes correct hourglass sealant geometry
• Works with all cold-applied sealants (not for hot-applied sealants)

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

Size selection:
Select a backer rod approximately 25–50% larger than the joint width to ensure a tight, compressive fit and effective bond-breaking action.

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, dirt, and dust. Ensure the joint is clean and dry before applying sealant.
• Repairing old joints: Remove all old sealant or filler. Use wire brushing and air blasting; use air compressor moisture/oil traps if applicable.

Installation instructions:

1. Prepare the surface per the Joint preparation directions.
2. Measure and select: Choose backer rod size based on joint width, oversized 25–50% for a snug fit.
3. Set depth: Install at the depth recommended by the sealant manufacturer so the sealant forms an "hourglass" shape.
4. Use the right tools: Install with a blunt tool or roller. Cat. No. T607CU605 or Cat. No. SBR