Open Cell Backer Rod – Polyurethane Foam Backing for Sealant Joints

The Open Cell Backer Rod is a compressible, cylindrical foam made from high-quality polyurethane. Designed specifically for use as a backing material in cold-applied sealant joints, it’s ideal for expansion joints, construction joints, and general building applications. Its open cell structure helps promote faster sealant curing and prevents outgassing through the sealant surface.

This rod is free from heavy metals, plasticisers, CFCs, and contains no fire retardants. It is supplied in a neutral grey colour for minimal visual impact in joints.

Available Sizes (Diameter/Roll Length):

• 10mm 200 metres
• 15mm 150 metres
• 20mm 100 metres
• 25mm 80 metres
• 30mm 60 metres
• 40mm 30 metres
• 50mm 20 metres

Custom sizes may be available on request for project quantities.

Key Benefits:

• Promotes even sealant depth and shape for optimal joint performance
• Prevents three-sided adhesion
• Allows moisture vapor transmission
• Helps reduce sealant consumption
• Encourages quicker curing with no outgassing issues

Recommended Installation:

Install with a minimum of 25% compression for effective joint support and barrier performance.