0043374714807

M-D Building Products

Model 71480

Internet #202066515

Store SKU #462440

1/2 in. x 20 ft. Caulk Backer Rod

$3.48 /each
  • Fills large gaps and openings
  • Provides a sound surface for caulking projects
  • For use in expansion joints in driveways and sidewalks

Frequently Bought Together

Product Overview

Before caulking, use the MD Building Products 1/2 in. x 20 ft. Caulk Backer Rod to help fill gaps and openings in pavement cracks, wall joints, foundations, sidewalks and driveways. The backer rod helps cushion and insulate and helps prevent 3-point bonding.

  • Fills gaps and openings in pavement cracks, wall joints, foundations, sidewalks and driveways
  • Non-absorbent, closed-cell polyethylene pre-caulking material
  • Twist multiple strands together to fill large cracks, gaps
  • Gray finish

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Customer Questions & Answers

8 Questions8 Answers

Customer Questions & Answers

1/2 in. x 20 ft. Caulk Backer Rod
1/2 in. x 20 ft. Caulk Backer Rod

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This question is from 1/2 in. x 20 ft. Caulk Backer Rod
 
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Can I use this with hot melt rope crack filler

This question is from 1/2 in. x 20 ft. Caulk Backer Rod
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Connecticut
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August 3, 2016
Will this be ok to use as a filler before I use hot melt rope filler with a small torch?
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Answer (1)

August 5, 2016
Answer: 
We do not recommend the use of a torch on this product. Thank you for your interest in our product. M-D Building Products
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This question is from 1/2 in. x 20 ft. Caulk Backer Rod
 
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What type of caulk should I use with this product for patio expansion joint in upstate NY?

This question is from 1/2 in. x 20 ft. Caulk Backer Rod
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July 10, 2016
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Answer (1)

July 12, 2016
Answer: 
Any silicone-based caulking would work well for this project and is compatible with our Backer Rod. Thank you for your interest in our product-- M-D Building Products
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This question is from 1/2 in. x 20 ft. Caulk Backer Rod
 
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Regarding materials' compatibility, can this be used with Sikaflex 1a to prevent 3 point bonding?

This question is from 1/2 in. x 20 ft. Caulk Backer Rod
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June 8, 2016
Note: Sikaflex 1a is a one part polyurethane, elastomeric sealant/adhesive.
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June 13, 2016
Answer: 
Our product manager for this project tells us that this product is suitable for use with Sikaflex 1a. Thank you for your interest in our product-- M-D Building Products
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This question is from 1/2 in. x 20 ft. Caulk Backer Rod
 
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Question about use of this product with self leveling sealant...

This question is from 1/2 in. x 20 ft. Caulk Backer Rod
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May 14, 2016
I would like to use the foam backer rod to fill a gap between concrete steps and house foundation...temporary fix, I know...but I have read to fill the gap with foam backer rod to within about a 1/2" of top, then shoot caulk into the corners and around the edge of the foam to create a 'dam'...then fill the remaining space with self leveling sealant...I would wait to use the leveling sealant until the caulk dries/cures...Will self leveling sealant adhere to caulk around the foam? Do you have any suggestions or comments on this plan? Thank you for your assistance.
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May 24, 2016
Answer: 
This product is intended to use with caulking products. From your description, this product is well-suited for that application. Thank you for your interest in our product--- M-D Building Products
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Customer Reviews

Rated 5.0 out of 5 by 7 reviewers.
Rated 5.0 out of 5.0 by Great Stuff Used backer rod on a new door I was putting. Was easy to use and worked great on filling in between the frame and wall. Save much on caulk too! August 30, 2016
Rated 5.0 out of 5.0 by Just what I expected I am not using this product for its intended use. I am a quilter and cut it up to replace the very costly Pinmoors used in quilt layering. February 10, 2016
Rated 5.0 out of 5.0 by Great for stefens I bought this fbr for homade nerf darts works great!!! February 20, 2016
Rated 5.0 out of 5.0 by Great Concept for Caulk Backer The Caulk Backer rod filled the gaps and minimized the need for gobs of caulk. This product wedged into the crack very well and I applied the caulk over top of this product. The results were superb. September 8, 2015
Rated 5.0 out of 5.0 by Good buy I used this product to fill in gaps around window siding before re-caulking and it worked well. I just wish it was stocked at the store. December 17, 2014
Rated 5.0 out of 5.0 by Easy to use, doesn't tear Had to use to fill large gap between driveway and foundation. In some places, had to twist larger sizes of backer rod to fill gap so the sealant will adhere only to the sides and not the bottom of the gap. This keeps it 'floating' as the gap expands and contracts. This backer rod is easy to twist and keep twisted, returns to its shape when untwisted, is easy to knot or fold, and to compress into appropriate sizes and shapes to fill all sorts of odd sizes of gaps. September 28, 2012
Rated 5.0 out of 5.0 by exactly what i needed May 1, 2011
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