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Open Cell Backing Rod - RoundVendor:
Use Adheseal Open Cell Backing Rod to prevent sealant gassing and three-sided adhesion in expansion joints. Its breathable polyurethane foam ensures faster, more complete sealant curing, critical for long-term performance across a wide range of cold and hot pour sealants.- From $138.36
- From $138.36
- Unit price
- per
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Open Cell Backing Rod - SquareVendor:
Square Open Cell Backing Rod is a breathable, non-gassing foam for joint sealing. It prevents 3-sided adhesion, supports consistent sealant shape, and is compatible with various sealants. Ideal for expansion joints with square or rectangular profiles.
- From $3.06
- From $3.06
- Unit price
- per
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Adheseal Backing Rod Closed Cell - RoundVendor:
Adheseal Closed Cell Backing Rod is a high-quality polyethylene foam filler designed for construction joints, providing excellent support and preventing 3-sided adhesion for sealants.
- From $12.30
- From $12.30
- Unit price
- per
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Biyseal Bitumen Impregnated FoamVendor:
Biyseal Polyurethane Impregnated Foam delivers a reliable, long-lasting seal for expansion joints and weatherproofing, adapting to various environmental conditions.
- From $134.19
- From $134.19
- Unit price
- per
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Biyseal Acrylic Impregnated FoamVendor:
Use Biyseal Acrylic Impregnated Foam for immediate, weather-tight sealing of dynamic joints; it offers over 90% elastic recovery and blocks heavy rain at 75% compression.
- $136.58
- $136.58
- Unit price
- per
Frequently Asked Questions
Why use backing rod in a sealant joint?
Backing rod controls the sealant depth and helps create the correct hourglass joint profile. It also prevents three-sided adhesion, allowing the sealant to move as designed. Select the rod size and material for the joint width, depth, exposure and specified sealant system.
Which backing rod type should I choose?
Open-cell, closed-cell and fire-rated backing rods serve different joint requirements. Closed-cell foam limits moisture entry, open-cell foam may suit particular joint designs, and fire-rated products are used only where the tested system requires them. Follow the project specification and manufacturer guidance.
How tightly should backing rod fit?
The rod should fit securely without being stretched, cut or compressed beyond the manufacturer’s guidance. Oversizing can damage the joint faces or distort the sealant depth; undersizing can allow movement or loss of support. Use an insertion tool where needed to place the rod consistently.
Can I puncture closed-cell backing rod?
Avoid damaging closed-cell rod during installation because punctures can allow moisture into the material and change its performance. Use a blunt insertion method and do not use sharp tools that cut the foam. Replace damaged sections before applying the sealant.
Is backing rod required for every joint?
No. It is used where joint geometry and the sealant system require controlled depth or bond-breaker support. Some shallow gaps or specific proprietary systems use another detail. Check the joint design, sealant technical data and project specification before deciding how to prepare the joint.
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