Description
Foam backer rod material is an ideal, non-absorbent, compressible backup material inserted into a joint to control sealant depth and create a backstop to:
- Allow for proper sealant tooling.
- Allow for proper sealant wetting of the joint surfaces.
- Yield proper bond breaker between the backup material and sealant.
Foam backer rod is a backstop material for most hot-pour sealants used to fill contraction and expansion joints of concrete highways, runways, driveways, and parking lots. It is compatible with most rubber-asphalt and coal tar-rubber polymer thermoplastic compounds.
- 100 ft, (1) bag
- 500 ft, (1) bag
- 1500 ft, (15) 100 ft bags
- 2000 ft, (4) 500 ft bags
The Foam Backer Rod Material 5/8″ Foam Rope is a professional-grade joint backing solution designed to enhance the performance and longevity of sealants in construction and pavement maintenance projects. This compressible, non-absorbent foam provides a reliable base for expansion and contraction joints, helping contractors achieve consistent sealant depth, proper tooling, and optimal adhesion. Its flexibility allows it to conform to a variety of joint widths while acting as a bond breaker to prevent three-sided adhesion, which is essential for durable, long-lasting sealant performance.
Used across both new construction and repair projects, the 5/8″ diameter size is ideal for small-to-medium joints in concrete highways, runways, driveways, and parking lots. Its consistent shape ensures a uniform hourglass profile for applied sealants, allowing materials to expand and contract freely without compromising joint integrity.
Performance and Usage Benefits
Contractors rely on foam backer rod to streamline the sealant process while improving finished joint quality. By controlling the depth of the sealant, this backer rod ensures that the sealant maintains the proper geometry and can perform as intended over time. The rod also prevents sealant from adhering to the bottom of the joint, reducing stress on the material and minimizing the risk of premature cracking or disbonding.
The non-absorbent, closed-cell construction prevents moisture penetration, which is critical for ensuring proper adhesion of hot-pour or elastomeric sealants. It also helps speed up installation by providing a lightweight, flexible, and easy-to-handle material that fits neatly into joints without excessive tooling. Contractors benefit from faster setup, uniform sealant application, and reduced labor costs.
The 5/8″ foam backer rod is suitable for a wide range of professional applications, including sealing small joints in parking lots, sidewalks, roadways, or industrial surfaces. Its compressibility and resilience allow it to maintain its shape under the pressure of sealant application, creating a durable, long-lasting foundation for high-quality joint repairs.
Durability and Construction
Made from closed-cell foam, this backer rod resists oils, gasoline, solvents, and environmental exposure, making it ideal for outdoor applications. Unlike open-cell foam, it does not absorb water or deteriorate over time, ensuring long-term performance and compatibility with most rubber-asphalt, coal-tar rubber, and elastomeric sealants.
The foam rope is available in multiple convenient lengths to accommodate projects of varying sizes, including:
- 100 ft (1 bag)
- 500 ft (1 bag)
- 1500 ft (15 x 100 ft bags)
- 2000 ft (4 x 500 ft bags)
This variety allows contractors to select the appropriate quantity for small repairs, mid-sized applications, or large-scale pavement maintenance projects.
Common Applications
The 5/8″ Foam Backer Rod is widely used across construction and asphalt maintenance projects, including:
• Expansion and contraction joints in parking lots, driveways, and roadways
• Joints in concrete highways, runways, and pre-cast concrete structures
• Bridge decks and pedestrian walkways
• Commercial and industrial floor joints for sealant applications
• Pavement and asphalt maintenance for small and medium-width cracks
Key Features
• Non-absorbent, compressible foam for optimal sealant support
• Ensures proper sealant depth and joint hourglass profile
• Acts as a bond breaker to prevent three-sided adhesion
• Resistant to oils, gasoline, solvents, and environmental stress
• Lightweight, flexible, and easy to install
• Suitable for both new construction and repair applications
• Available in multiple lengths for different project sizes
Technical Specifications
Diameter: 5/8 inches
Material: Closed-cell foam, non-absorbent
Length Options: 100 ft, 500 ft, 1500 ft (15 x 100 ft bags), 2000 ft (4 x 500 ft bags)
Application: Expansion and contraction joints, concrete, asphalt, driveways, parking lots, bridge decks, industrial floors
Function: Controls sealant depth, creates a backstop, ensures proper sealant tooling
