Model # 71480

Internet #202066515

Store SKU #462440

M-D Building Products 1/2 in. x 20 ft. Caulk Backer Rod
0043374714807

M-D Building Products

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

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

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

Info & Guides

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Specifications

Dimensions

Details

Warranty / Certifications

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Customer Questions & Answers

Can this be trimmed to fit the space?

I have the 1/2 inch backer rod and it fills the gap but is flush with the trim rather then sitting under it.
Asked by: CC
Then you will need a smaller backer rod 3/8" and then fill the gap with a acrylic latex caulking
Answered by: MDBuildingProductsSupport
Date published: 2017-02-14

Is this product safe to use near chimney brick (which may cause moderate heat)?

Is this product safe to use near chimney brick (which may cause moderate heat)?
Asked by: Bud
No you need something that resist heat and we do not a product for that
Answered by: MDBuildingProductsSupport
Date published: 2017-02-10

Do you have it in spools of a hundred feet or more in store

Asked by: Rabbit
Yes, it is in certain stores at the moment as a promotional product. Please check with your local Home Depot to see if they have it in their store. To order the product online, it is Item# 71551, and is 250' long. Thank you for your interest in our product. M-D Building Products
Answered by: MDBuildingProductsSupport
Date published: 2016-10-31

Can I use this with hot melt rope crack filler

Will this be ok to use as a filler before I use hot melt rope filler with a small torch?
Asked by: Jimmy
We do not recommend the use of a torch on this product. Thank you for your interest in our product. M-D Building Products
Answered by: MDBuildingProductsSupport
Date published: 2016-08-06
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Customer Reviews

1/2 in. x 20 ft. Caulk Backer Rod is rated 5.0 out of 5 by 7.
Rated 5 out of 5 by from 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.
Date published: 2012-09-28
Rated 5 out of 5 by from Great for stefens I bought this fbr for homade nerf darts works great!!!
Date published: 2016-02-21
Rated 5 out of 5 by from 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.
Date published: 2015-09-08
Rated 5 out of 5 by from 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.
Date published: 2014-12-17
Rated 5 out of 5 by from 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!
Date published: 2016-08-30
Rated 5 out of 5 by from 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.
Date published: 2016-02-10
Rated 5 out of 5 by from exactly what i needed
Date published: 2011-05-02
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