Armacell 1" Closed Cell Backer Rod/Crack Filler (25 ft)

This backer rod is part of my sidewalk expansion joint replacement. Pulled the old, rotting wood, filled the crevice with paver sand to 1.5 inches from the top. Tamped it down and leveled with a piece of 1.5 inch wood. Laid this backer rod on top of the sand, which fit tightly and sealed against the cement. The backer rod also reduces the amount of sealant caulk needed. Ideal depth is about 1/2 inch of this self leveling sealant. End result is shown. The local blue and orange stores did not carry the 1 inch backer rod, but this shipped quickly at a very reasonable cost. It is the density needed for this job and cuts easily with ordinary scissors. Don’t settle for the more common 3/4 inch, which may not yield a tight seal essential for SSL caulk. Highly recommended

I needed to reseal the driveway expansion joint. Use this backer rod and SIKA Sikaflex Self Leveling Sealant to seal it. Worked great. just be sure to measure the gap you have and bought whatever width you need. I little bit of a tight fit is good so the sealer doesn't just leak down past the backer rod. Lots of how to videos on YouTube if you need to fix yours.

Works well. Used it for my driveway expansion joints

UPDATE: Actually, it works perfectly, can cut width as needed as well as length. Held at post office because they did not know what to do with it. No shipping updates. The "closed cells" must be filled with helium and just as heavy as that puffy cheese snack that goes crunch. Not thick enough. Yet another gem of a purchase. Next time just bill me but not ship it to save me the from anxiety and despair.

Too thick for bottom of garage door though

good, durable even in very cold environment ,affordable and easy to use

Works great

These 25 ft rolls are dirt cheap and fill a lot of volume. Bigger and cheaper than any backer rod I could find at home depot. I used together with Sikaflex self levelling sealant which is great stuff, but really expensive per tube. This helps you minimize your usage of it, and to ensure the rod doesn't float up in a wider crack. The backer rod helped keep my project cost down by about half of what a sealant only solution would have been, and probably ~$15 less than if I used more of the small rod options available at HD. The results came out beautifully.