Closed-Cell Foam Backer Rod.

Product Details

Based on standard manufacturing specs for this specific type of grey polyethylene foam, here is what you are dealing with:

• Estimated Length: Approximately 15 to 20 feet (Judging by the coil size and standard retail lengths like Quikrete or Sika packs).---- LENGTH IS APPROX. THIS PRODUCT HAS BEEN USED

• Diameter: Appears to be 5/8 inch to 3/4 inch (Standard sizing for medium masonry and pavement cracks).

What is This Product Used For?

This item is a Closed-Cell Foam Backer Rod.

In the construction and DIY world, its primary job is to act as a gap filler and depth-controller inside expansion joints or deep cracks (like in concrete driveways, masonry walls, or around window frames) before you apply caulk or sealant.

By shoving this flexible foam noodle into the crack first, you accomplish two things:

• Save Money: You don't waste half a dozen expensive tubes of caulk filling a bottomless pit.

• Proper Bonding: It stops the sealant from sticking to the bottom of the crack, allowing the caulk to expand and contract properly between the two side walls without tearing.