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The M-D Building Products 71480 Backer Rod is a 1/2-inch thick, 20-foot long polyethylene foam rod designed to fill large gaps before caulking. Waterproof and easy to use, it provides a reliable, smooth surface for caulking projects, preventing drafts and improving insulation. Trusted by thousands with a 4.6-star rating, it’s a must-have for professional-grade weatherization and finishing.










| ASIN | B000BQWOC0 |
| Best Sellers Rank | #67,894 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #149 in Raw Building Materials |
| Brand | M-D Building Products |
| Brand Name | M-D Building Products |
| Color | Gray |
| Colour | Gray |
| Customer Reviews | 4.6 out of 5 stars 3,781 Reviews |
| Global Trade Identification Number | 00043374714807 |
| Item Form | Foam |
| Item Type Name | Backer Rod |
| Item Weight | 9 g |
| Item form | Foam |
| Item weight | 9 g |
| Manufacturer | M-D Building Products |
| Material Type | Polyethylene (PE) |
| Maximum Gap Fill | 0.5 Inches |
| Maximum gap fill | 0.5 Inches |
| Model | 71480 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Part Number | 71480 |
| Surface Recommendation | wall |
| Surface recommendation | wall |
| UPC | 043374714807 |
| Unit Count | 1.0 Count |
| Water Resistance Level | Waterproof |
R**I
Quality is Good but cost is too much
Cost is too much.. Similar products are available in lowest prices..
A**S
Perfect for Packing Large Gaps Before Caulking
Really happy with this foam backer rod. It arrived right on time and in perfect condition, no damage at all to the packaging. Works exactly as described and made packing large gaps before caulking so much easier. Great quality material and easy to use. Would definitely buy again for future projects.
R**Z
just what I expected.
Ideal solution for one of my projects. Happy to find higher volume package at good price. M-D Building Products came through yet again for me.
G**O
Excelente
Excelente como apósitos para las orejas de mis doberman
N**I
Used for my dogs ears
I’ve been using very thin backer rod for posting my dog’s ears, and it’s been a fantastic solution! It’s lightweight, flexible, and provides just the right amount of support without causing any discomfort. It’s easy to cut to size and stays in place securely. Plus, it’s gentle on the ears and works perfectly with sports tape. Highly recommend for anyone looking for a reliable and comfortable ear-posting method!
Trustpilot
2 weeks ago
1 week ago