Backer Rod / Joint Strip / Foam SheetsDescription Extruded Closed Cell Polyethylene Rod An inexpensive, yet effective "backing", commonly referred to as Backer Rod. Backer Rod is an extruded, chemically inert, closed cell polyethylene "rope" designed to effectively fill in the gaps between logs prior to the application of Perma Chink or Energy Seal. Backer Rod is flexible and compressible; it conforms to the irregularities in the log surface. Its primary function is recognized as a median
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