Backer Soft Rod

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Create a backstop to allow proper sealant tooling

Soft-Type Backer Rod (104)

Compatibility: Soft Type Backer Rod is virtually an inert composition and therefore compatible with all known cold-applied sealants including butyl, polysulfide, acrylic, polyurethane and silicone.
Diameter: 3/8 in 5/8 in 7/8 in Length: 850 ft 1550 ft 2100 ft Select Options
Product # Diameter Length Price
D030025 3/8 in 2100 ft $101.53
D030026 5/8 in 1550 ft $90.60
D030027 7/8 in 850 ft $88.76


Product Type
Ideal Use
Aluminum Windows, Wood Windows, Vinyl (PVC) Windows, Expansion Joints, Curtain-Window Wall Systems


Basic Use: Soft Type Backer Rod is a soft, pliable, non-gassing backup material inserted into an expansion or contraction joint to:

- Control sealant depth
- Create a backstop to allow proper sealant tooling
- Ensure sealant adhesion to joint surfaces only
- Yield a proper break between backup material and sealant.
- It can also be used as a temporary joint seal.