is an easy to compress, rope-like celled polypropylene / polyolefin based foam. It is inserted into a clean joint at the required depth before adding caulk / sealant. Backer Rod creates an even depth and supports (back stops) the sealant / caulk allowing it to form the proper shape (about 2x as wide as deep) and also prevents 3 sided adhesion (bond breaker). It is especially important to use it with Self Leveling Expansion Joint Sealants. Very large and Soft Backer Rods are also used for filling gaps and for sealing in general construction.
- High moisture environments
- Ground based expansion joints
- General purpose sealant backing
- Use together with self-leveling sealant
- Highway joints
- Parking garages
- Around perimeters of door and window frames
- Coping and glazing joints
- Log Home chinking
- Isolation joints
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3/4" dia. closed cell foam