Caulk Saver Foam Backer Rod for Gaps and Joints Backing Rod Concrete Filler Rope, Gray (3/8 Inch x 40 Ft)

When the worker removed my countertop, he accidentally broke off almost a foot of the chair rail. This was the perfect mend once we caulked and painted.

My flooring installation guide told me this was required for a correct installation. The length was as promised and it fits well in the space left between the floor and the wall, but I have no idea if it really does any good. I've left these out before and come back 10 years later... Everything was fine. So, what is this really accomplishing? I don't know, unless it helps fill in the gap and block air from circulating so easily in some installations. It should keep the floor from moving? But, I don't see how - you can squeeze easily between your fingers, so it doesn't resist much. Oh, well... Done and dusted.

Works great

As I sit here reading some of the reviews, I couldn't help but wonder what the expectation was for this product. It's a filler for concrete gaps. I found using a small bead of seal in there before stuffing it in place makes or hold perfectly. I covered the foam with seal and it's just fine.

Need to caulk the railing of drop rolling fire door and used this rope to fill the larger gaps beforehand. Works as expected without complaints.

You can go through hundreds of dollars of caulk without a backer rod. It simply fills the place of caulk you would use without it. I paid about $10 per tube of caulk. My driveway is a dumpster fire. I think the builder buried logs underneath it. Grab your caulk and come out to the driveway. You'll see.

very simple to use; cut to length, push into the expansion gap. cover with self-leveling sealant.couldn't be any easier!much better rolling my work benches around the garage floor now; very satisfied and definitely recommend.

This product is a great invention! Just what you need to fill in spaces and still have flexibility!