Soft Backer Rod is a soft, gray, pliable, non-gassing backup material inserted into an expansion or contraction joint to:
- control sealant depth,
- create a backstop to allow for proper sealant tooling,
- ensure sealant adhesion to joint surfaces only,
- and, yield a proper bond break between backup material and sealant.
Soft Backer Rod is particularly well suited for specialty applications where standard backer rods are not appropriate. Soft Backer Rod is ideal in irregular joint applications where self leveling, flowable sealants are employed. Soft Backer Rod is also recommended for use with sealants where bubbling concerns are critical. It is compatible with all known cold applied sealants including butyl, polysulfide, acrylic, polyurethane, and silicone.
Soft Backer Rod may be used in place of most standard backer rod applications or as a temporary joint seal.