Foam Backer Rod Closed Cell Foam Rope Backer Rod is extruded closed-cell polyethylene rod that is used in cracks, checks and gaps before filling them with sealants such as Perma-Chink, Energy Seal and Check Mate 2. Caulk joints should not be more than 3/8” thick and Backer Rod provides a way to fill a deep crevice or gap while maintaining the proper sealant thickness for maximum performance. Backer Rod should also be used in checks over 1/4” wide before applying Check Mate 2.
Closed cell polyethylene
Will not absorb water
Heat and cold stable.
Should be used to assure proper thickness of sealants including Perma-Chink,Energy Seal and Check Mate 2.