---
product_id: 4877844
title: "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)"
brand: "m-d building products"
price: "₩24323"
currency: KRW
in_stock: true
reviews_count: 13
category: "M D Building Products"
url: https://www.desertcart.kr/products/4877844-m-d-building-products-versatile-gray-foam-backer-rod-set
store_origin: KR
region: South Korea
---

# 0.5in max gap fill easy trim & twist fit weather-resistant foam 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)

**Brand:** m-d building products
**Price:** ₩24323
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal smarter, live cozier — don’t let gaps steal your comfort!

## Quick Answers

- **What is this?** 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) by m-d building products
- **How much does it cost?** ₩24323 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/4877844-m-d-building-products-versatile-gray-foam-backer-rod-set)

## 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

- • **Seal Like a Pro:** Perfectly fills medium concrete gaps up to 1/2 inch for airtight, draft-proof joints.
- • **Cut & Fit Your Way:** Easily trimmed or twisted to custom fit any expansion joint or crack—no special tools needed.
- • **Effortless Installation:** Push in place and caulk over—no messy adhesives or complicated prep required.
- • **Multi-Purpose Home Hero:** Ideal for sealing windows, doors, driveways, and even DIY projects like Doberman ear posting—versatility that saves time and money.
- • **Built to Brave the Elements:** Durable, waterproof foam that withstands rain, sun, and temperature swings without losing form.

## Overview

The M-D Building Products Versatile Gray Foam Backer Rod is a 1/2 inch thick, 20-foot long weather-resistant foam designed to fill and seal medium-sized gaps in concrete, expansion joints, and cracks. Waterproof and easy to trim or twist for a custom fit, it provides a durable base for caulking that enhances airtightness and insulation indoors and outdoors. Trusted by professionals and DIYers alike, it’s a cost-effective solution that improves home comfort and protects against drafts, dust, and moisture.

## Description

desertcart.com: 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) : Industrial & Scientific

Review: Perfect Core Material for Ear Posts—Must-Have for Owners! - 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: Good magnetic screwdrivers for drill gun. - Very good magnetic screwdrivers for drill gun. Good quality metal screwdrivers. Works well.

## Features

- 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.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000BQWOC0 |
| Best Sellers Rank | #2,908 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #54 in Weather Stripping |
| Brand | M-D Building Products |
| Color | Gray |
| Date First Available | October 12, 2005 |
| Global Trade Identification Number | 00043374714807 |
| Is Discontinued By Manufacturer | No |
| Item Form | Specialty |
| Item Weight | 0.32 ounces |
| Item model number | 71480 |
| Manufacturer | M-D Building Products |
| Material | Foam |
| Maximum Gap Fill | 0.5 Inches |
| Number of Items | 1 |
| Product Dimensions | 12 x 8.75 x 2 inches |
| Surface Recommendation | wall |
| UPC | 043374714807 |
| Unit Count | 1.0 Count |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** M-D Building Products
- **Color:** Gray
- **Item Form:** Specialty
- **Item Weight:** 0.02 Pounds
- **Maximum Gap Fill:** 0.5 Inches

## Images

![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) - Image 1](https://m.media-amazon.com/images/I/61UnawlcwQL.jpg)

## 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

### ⭐⭐⭐⭐⭐ Perfect Core Material for Ear Posts—Must-Have for Owners!
*by T***D on November 15, 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!

### ⭐⭐⭐⭐⭐ Good magnetic screwdrivers for drill gun.
*by G***D on December 10, 2025*

Very good magnetic screwdrivers for drill gun. Good quality metal screwdrivers. Works well.

### ⭐⭐⭐⭐⭐ Insulate those pipes with this
*by S***Y on December 21, 2025*

Bargainprice for a product that works well!

## 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 South Korea*
*Store origin: KR*
*Last updated: 2026-03-07*