---
product_id: 77420348
title: "M-d Products .50in. X 20ft. Backer Rod For Gaps & Joints 71480"
brand: "m-d building products"
price: "$55.03"
currency: USD
in_stock: true
reviews_count: 5
category: "M D Building Products"
url: https://www.desertcart.us/products/77420348-m-d-products-50in-x-20ft-backer-rod-for-gaps
store_origin: US
region: United States of America
---

# 20 ft. continuous length Closed-cell polyethylene, non-absorbent M-d Products .50in. X 20ft. Backer Rod For Gaps & Joints 71480

**Brand:** m-d building products
**Price:** $55.03
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal smart, save time – the pro’s secret to flawless joints!

## Quick Answers

- **What is this?** M-d Products .50in. X 20ft. Backer Rod For Gaps & Joints 71480 by m-d building products
- **How much does it cost?** $55.03 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/77420348-m-d-products-50in-x-20ft-backer-rod-for-gaps)

## Best For

- m-d building products enthusiasts

## Why This Product

- Trusted m-d building products brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Extended Reach:** Generous 20-foot length ensures you have enough material for multiple projects or large areas.
- • **Seamless Gap Filler:** Perfectly sized 0.5-inch diameter to fill cracks and joints with precision.
- • **Versatile Application:** Ideal for pavement cracks, wall joints, foundations, sidewalks, and even creative DIY uses like ear posting.
- • **Professional Grade Value:** Trusted by pros and DIYers alike for reliable cushioning, insulation, and preventing 3-point bonding.
- • **Durable & Moisture-Resistant:** Closed-cell polyethylene construction prevents water absorption and enhances insulation.

## Overview

M-D Products 0.5in x 20ft Backer Rod is a high-quality, closed-cell polyethylene foam designed to fill and insulate gaps in pavement cracks, wall joints, foundations, sidewalks, and driveways. Its non-absorbent, durable material prevents moisture intrusion and 3-point bonding, while the 20-foot length and 0.5-inch diameter provide versatile, professional-grade performance for both construction and innovative DIY applications.

## Description

Before caulking use the 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.Features. 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.. Size - 0.5 in. x 20 ft.

Review: Cost is too much.. Similar products are available in lowest prices..
Review: Though intended for sealing concrete gaps, this M-D Foam Backer Rod is an absolute game-changer for Doberman owners using DIY methods for ear posting. ​Perfect Density & Size: The 1/2 inch size and density are ideal for creating a stable, lightweight, and comfortable post core that is custom-cut to fit the ear canal perfectly. ​How to Use: The key to success is modification! It worked perfectly when wrapped in duct tape (or Zonas tape) to give it a firm, smooth exterior. This combination creates a far superior post than many specialized materials. ​Value: With 20 feet of material, this set offers incredible value, providing enough post material to last through the entire posting process for one or more puppies. ​If you are posting Doberman, Great Dane, or Boxer ears, forget the expensive custom kits—this backer rod, wrapped in tape, is the professional-level core you need. Highly, highly recommend!

## Features

- 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.
- Size - 0.5 in. x 20 ft.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000BQWOC0 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 556,588 in Beauty ( See Top 100 in Beauty ) 5,645 in Body Oils |
| Colour | Gray |
| Customer Reviews | 4.6 4.6 out of 5 stars (3,654) |
| Date First Available | 21 April 2012 |
| Item Package Quantity | 1 |
| Item Weight | 9.07 g |
| Item model number | 71480 |
| Manufacturer | M D Building Products |
| Material | Polyethylene (PE) |
| Number of Pieces | 1 |
| Part number | 71480 |
| Product Dimensions | 30.48 x 22.23 x 5.08 cm; 9.07 g |
| Size | 20 Ft. |

## Product Details

- **Brand:** M-D Building Products
- **Colour:** Gray
- **Item form:** Paste
- **Item weight:** 9 g
- **Maximum gap fill:** 0.5 Inches

## Images

![M-d Products .50in. X 20ft. Backer Rod For Gaps & Joints 71480 - Image 1](https://m.media-amazon.com/images/I/413DabwbHsL.jpg)
![M-d Products .50in. X 20ft. Backer Rod For Gaps & Joints 71480 - Image 2](https://m.media-amazon.com/images/I/4141cO3izOL.jpg)
![M-d Products .50in. X 20ft. Backer Rod For Gaps & Joints 71480 - Image 3](https://m.media-amazon.com/images/I/513MLxKGdlL.jpg)
![M-d Products .50in. X 20ft. Backer Rod For Gaps & Joints 71480 - Image 4](https://m.media-amazon.com/images/I/51E5E0vYkLL.jpg)
![M-d Products .50in. X 20ft. Backer Rod For Gaps & Joints 71480 - Image 5](https://m.media-amazon.com/images/I/51SblrTei7L.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: Is it safe to use near hot water baseboard radiators? I want to use it behind radiator cover as a temporary fix for a cold draft.**
A: I suspect it would be safe if between the wall and the top cover of the baseboard, assuming you have standard baseboard covers like mine -- which never get super hot. It's foam, and will likely melt if too close to a heat source. To be on the safe side, I'd suggest first contacting the company directly.

**Q: Can you use barge glue and plastidip**
A: Call the manufacturer

**Q: I live in an apartment and i feel a draft coming through the cracks of my window would this help? Im trying to avoid using weather tape**
A: I purchased the medium backer rod and they are 1/2" thick. I think the one I purchased would be too thick to insert into the crack of your windows.  Maybe there is a smaller version that would work for you.

**Q: What caulking do u need for this ?**
A: I did use caulk as it was used to support a garage door seal as the bottom of the door.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by R***I on 23 November 2018*

Cost is too much.. Similar products are available in lowest prices..

### ⭐⭐⭐⭐⭐ Review
*by T***D on 15 November 2025*

Though intended for sealing concrete gaps, this M-D Foam Backer Rod is an absolute game-changer for Doberman owners using DIY methods for ear posting. ​Perfect Density & Size: The 1/2 inch size and density are ideal for creating a stable, lightweight, and comfortable post core that is custom-cut to fit the ear canal perfectly. ​How to Use: The key to success is modification! It worked perfectly when wrapped in duct tape (or Zonas tape) to give it a firm, smooth exterior. This combination creates a far superior post than many specialized materials. ​Value: With 20 feet of material, this set offers incredible value, providing enough post material to last through the entire posting process for one or more puppies. ​If you are posting Doberman, Great Dane, or Boxer ears, forget the expensive custom kits—this backer rod, wrapped in tape, is the professional-level core you need. Highly, highly recommend!

### ⭐⭐⭐⭐⭐ Review
*by G***O on 4 November 2025*

Excelente como apósitos para las orejas de mis doberman

## Frequently Bought Together

- M-D Building Products - Versatile Gray Foam Backer Rod Set 1/2in x 20ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71480)
- 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)
- Sikaflex Self Leveling Sealant, Gray, polyurethane with an accelerated curing capacity for sealing horizontal expansion joints in concrete, 10.1 fl. oz Cartridge

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-26*