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M-D Building Products - Versatile Gray Foam Backer Rod - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling, 3/8 by 20 Feet, (Pack of 2) (71464)

Free shipping on orders over $29.99

$3.93

$ 1 .99 $1.99

In Stock

1.Size:20 Ft.


2.Style:Backer Rod


  • Quality Construction: This gap filler is made from high-quality, weather-resistant materials, ensuring long-lasting durability and performance. It effectively seals medium gaps between surfaces, preventing drafts and dust from entering your home. Suitable for both indoor and outdoor use, it withstands various weather conditions, providing consistent protection and improved comfort.
  • Concrete Gap Filling Excellence: Our product excels in filling concrete gaps, creating a strong foundation for caulking projects. Utilize this foam to effectively fill joints between surfaces, ensuring dependable adhesion for caulking applications that promise enduring durability and resilience.
  • Complete Gap Solution: This product provides versatile gap filling, preventing drafts and offering a sturdy base for caulking. Perfect for expansion joints in driveways and sidewalks, it can be twisted for larger gaps and easily trimmed with scissors to the desired size.
  • Effortless Installation: Enjoy a hassle-free setup by effortlessly pushing the backer rod into most joint openings until it fits snugly. Once installed, enhance the seal further by applying caulk on top—no need for messy sealants or adhesives.
  • Versatile Application: From repairing leaky roofs and window sills to addressing drafty doors, the Backer Rod is your go-to solution! Beyond sealing surface gaps, it excels in insulating, enhancing airtightness, and damp-proofing your home—offering multifaceted benefits for various household needs.



Product Description

Backer Rod Module 1
Backer Rod Module 2
excellent insulation module 3
covers most gap sizes module 4
multiple uses module 5

Karen
Reviewed in the United States on February 19, 2025
Great product, made sealing our driveway a breeze!
Amy
Reviewed in the United States on January 3, 2025
We used this when installing engineered hardwood in our home. Functional, easy to use, and a great value. Would recommend!
J. Heiskell
Reviewed in the United States on January 15, 2025
Does what any good backer rod would! Works great and gets the job done.
John C. Jackovich
Reviewed in the United States on September 19, 2024
It works and is useful. Again, I don't understand why it says pack of 2 when I only get 1.
BVance
Reviewed in the United States on July 22, 2024
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.
don
Reviewed in Canada on November 8, 2024
Use in conjunction with hollow plastic rods (from Amazon) and lead tape to make shaft heavier after club assembly.
Lynn
Reviewed in the United States on November 12, 2024
Used this in my garage to put in bottom of windows where there seems to be a small space when windows are closed. I’m sure I will find plenty of other uses for them.
ES
Reviewed in the United States on October 7, 2024
I had never used backer rod before and have found this super useful in my endeavors to seal my home. It can be cut to fit in smaller places if necessary and while I haven't tried this yet, the packaging says it can be doubled up for larger places.
Barbara Edwards
Reviewed in the United Kingdom on September 30, 2023
Great for posting my Dobermans ears thanks x
Ravinder singh
Reviewed in Canada on August 25, 2023
It keeps my stove clean
Customer
Reviewed in Canada on December 30, 2020
Good product
Pedicularis
Reviewed in Canada on June 13, 2018
Good price for the quality of the product. Did the job.
Tim
Reviewed in the United States on July 14, 2016
So I've been looking around for a way to fix my concrete driveway. Unfortunately the concrete expansion joints have separated and have made a pretty big gap. After much research I found that I should use a backer rod to lay in the expansion joints and than use a self leveling chalk to seal it in. This will prevent any additional water from eroding the base material under the concrete. I needed a couple different sizes as the width of the expansion joints was different as you went up the length of the driveway. I found what I needed. The M-D Building Products Backer Rod. I bought both a 1/4 and 1/2 sizes. I like to tell people about my shopping experiences in this case I'll cut and paste this same review for both the 1/4 and 1/2 sizes I received (no big differences in these). Both the 1/4 and 1/2 inch arrived on time. They were packaged very well. Super light as you can imagine. The backer rod is like a foam material. It fit well into the expansion joints. A nice snug fit. This is exactly what I was looking for. Otherwise with as wide and deep as these expansion joints have gotten it would have taken a lot of self leveling chalk to fill them in. The material cut really easy. I use my utility knife but an ordinary pair of scissors would have worked just fine. I was happy with the quality. I felt confident when install it in the expansion joints that it would hold up just fine and do the job.