M-D Building Products - Versatile Gray Foam Backer Rod - Set 3/8in x 350ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71550)

Works well. I bought it to fill in gaps in my driveway. For the smaller cracks I cut the width of it. It is durable and a good price.

Great product, made sealing our driveway a breeze!

We used this when installing engineered hardwood in our home. Functional, easy to use, and a great value. Would recommend!

nice

Does what any good backer rod would! Works great and gets the job done.

A good filler for wider spaces between two panels that saves caullk/ adnesive/ sealiant. I am using this backer in some spaces between sheetrock and flooring to liquid proof them. Also good to keep critters out.

Had a small gap in my front door threshold after one of our animals ripped up the material that was originally in the gap.After reading many reviews for this product, gave it a shot. It was just what I needed! Super easy to use: measure, cut, install. Fits perfectly in the gap. No need to worry about dirt, bugs, and other debris getting in the gap.Great value too, as the 20ft bag was only about $3.00, with plenty left over if I need to replace it again.Highly recommend.

I cut these in half to make a half circle and then inserted them in between the drywall and subfloor to create a water tight seal along with caulking. I found that using the whole rod was too much and would prevent the baseboards from being installed flush with the flooring. I ended up returning half of them because I was able to cut the rod in half. Worked well and excellent.