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SOF Backer Rod (Gray) - NOMACO

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Professional-grade soft bi-cellular polyethylene backer rod designed for filling expansion joints, control joints, and gaps prior to sealant application in concrete, masonry, and construction projects. Manufactured by NOMACO with SOF construction in soft formulation and gray color, available in three diameter and length combinations to suit various joint sizes and project scales. This soft, flexible bi-cellular polyethylene foam rod provides proper backing for sealants, compresses easily into joints, controls joint depth, prevents three-sided adhesion, and reduces sealant consumption while ensuring optimal joint performance. The braided design doesn't spin as much as twisted line, bringing plumb bobs to rest sooner for faster layout work. Available in 7/8", 5/8", and 3/8" diameters with corresponding lengths optimized for different project requirements.

Bi-Cellular Polyethylene Construction: Soft formulation with extra-flexible foam compresses easily into irregular joints and tight spaces

Three Size Options: Choose diameter and length combination suited to joint width and project scale

Soft Formulation: Extra-flexible foam compresses easily into irregular joints and tight spaces

Gray Color: Neutral appearance suitable for visible joints and professional installations

Prevents Three-Sided Adhesion: Allows sealant to adhere only to joint sides, not bottom, for proper movement

SOF Backer Rod Design: Soft closed-cell polyethylene foam stays compressed in joints and maintains proper backing

Extended Length Options: Larger rolls provide maximum coverage for high-volume projects, minimizing material changes

Reduced Spinning: Doesn't spin as much as twisted alternatives for faster settling

Backing for concrete expansion and control joint sealants (all joint widths)

Concrete slab joint preparation before caulking

Sidewalk and driveway expansion joint backing

Masonry control joint backer rod installation

Building perimeter joint sealing preparation

Curtain wall and window/door perimeter joints

Parking lot and plaza joint sealing

Irregular or tight joints requiring soft, compressible backing

High-volume commercial and residential construction joint preparation

Material: Bi-cellular polyethylene (soft backer rod foam, closed-cell formulation)

Color: Gray

Type: Soft backer rod

Available Sizes:

7/8 inch diameter x 850 linear feet per roll
5/8 inch diameter x 1,550 linear feet per roll
3/8 inch diameter x 3,600 linear feet per roll

Manufacturer: NOMACO

Product Type: Bi-cellular polyethylene soft backer rod / backing rod / joint filler

Application: Expansion joint backing, control joint preparation, sealant depth control, construction joint sealing