59FT Length Backer Rod Foam Caulk Saver for Concrete Filling, Joints and Gaps, 3/8 in Diameter x 59FT Length (Grey)

Used this product as backing bar ….while caulking the gap between concrete deck and pavers for in ground pool. Use of backing bar allows you to control the depth of the gap for caulk application. Watched You Tube to learn the process. This product is simple to use, and worked great. I can’t say about durability because it’s only been installed for a week, but if the caulk keeps the gap watertight it should be fine.

Used these between my foundation wall and sidewalk. Used to have an asphalt fiberboard there used in forming the concrete. It just fell apart over time. I shoved this down the whole and It filled the crack. In some places I used silicone to hold it in place. It compresses so it can be used in smaller than 1/2" cracks. It does have it's limit. Fix saved water getting in my crawl space. They look strong and hope they last a long. time.

Nice, sturdy, well made. Not time tested by me, but seem to do a great job initially - so far.

Easy to work with, helped much with filling in gaps

used this to fill crackes in gap on a porch on a old house.At bottom of siding. then caulked .

Great for replacing spacers in concrete driveway

Used this filler in the cracks of my driveway with Slab. Easy to use and great price compared to Lowe's.

I wedged this in a gap between my driveway and the curb and filled it with a sealer. It did its job without any issues so I’m giving it 5 stars