---
product_id: 4320311
title: "Versatile Gray Foam Backer Rod - Set 5/8in x 20ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71506)"
brand: "m-d building products"
price: "€ 42.35"
currency: EUR
in_stock: true
reviews_count: 13
category: "M D Building Products"
url: https://www.desertcart.pt/products/4320311-versatile-gray-foam-backer-rod-set-5-8in-x-20ft
store_origin: PT
region: Portugal
---

# Easily trimmed to size Weather-resistant & waterproof 5/8in x 20ft foam rod Versatile Gray Foam Backer Rod - Set 5/8in x 20ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71506)

**Brand:** m-d building products
**Price:** € 42.35
**Availability:** ✅ In Stock

## Summary

> 🛡️ Seal smart, save time—your gap’s new best friend!

## Quick Answers

- **What is this?** Versatile Gray Foam Backer Rod - Set 5/8in x 20ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71506) by m-d building products
- **How much does it cost?** € 42.35 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/4320311-versatile-gray-foam-backer-rod-set-5-8in-x-20ft)

## 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

- • **Cut-to-Size Convenience:** Trim with scissors for a custom fit—no extra tools or hassle required.
- • **Effortless Installation:** Simply push into gaps and apply caulk on top for a professional-grade seal in minutes.
- • **Multi-Use Home Essential:** Ideal for concrete, expansion joints, drafty doors, windows, and even roof repairs—your all-in-one gap solution.
- • **Built to Brave the Elements:** Durable, weather-resistant foam stands strong against rain, wind, and temperature swings.
- • **Precision Fit for Every Gap:** Snug 5/8in diameter ensures perfect sealing for medium-sized joints and cracks.

## Overview

The Versatile Gray Foam Backer Rod by M-D Building Products is a 5/8in x 20ft high-quality, weather-resistant foam designed to fill and seal medium gaps in concrete, expansion joints, and cracks. Waterproof and durable, it provides a reliable base for caulking, enhancing insulation and draft prevention for both indoor and outdoor applications. Easy to install and trim, it’s a must-have for professional-grade weatherization and home improvement projects.

## Description

desertcart.com: M-D Building Products - Versatile Gray Foam Backer Rod - Set 5/8in x 20ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71506) : Industrial & Scientific

Review: Good product - Works very well for what I need.
Review: good quality, good service - I ended up ordering the wrong size for my project and had to return. However, the backer rod seems to be made of high-quality foam, and it feels dense and durable. It has a nice, consistent texture that should be great for filling gaps and joints. I can't speak to how well it works in the long term, but it appears sturdy and like it would do the job as intended. While I didn't end up using the backer rod, desertcart's return service made the process incredibly easy and the refund was instant.

## 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 | B000BQP1D4 |
| Best Sellers Rank | #27,639 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #97 in Hardware Sealers |
| Brand Name | M-D Building Products |
| Color | Gray |
| Customer Reviews | 4.7 4.7 out of 5 stars (1,600) |
| Global Trade Identification Number | 00043374715064 |
| Included Components | MD Building - 71506 |
| Item Form | Foam |
| Item Type Name | MD Building - 71506 |
| Item Weight | 1.76 ounces |
| Manufacturer | M-D Building Products |
| Material Type | Plastic |
| Surface Recommendation | surface_recommendation |
| UPC | 043374715064 |
| Unit Count | 1.0 Count |
| Warranty Description | Warranty |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** M-D Building Products
- **Color:** Gray
- **Item Form:** Foam
- **Item Weight:** 1.76 ounces
- **Surface Recommendation:** surface_recommendation

## Images

![Versatile Gray Foam Backer Rod - Set 5/8in x 20ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71506) - Image 1](https://m.media-amazon.com/images/I/61HHJ4QXlvL.jpg)

## Available Options

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

## Questions & Answers

**Q: This will seem like a bizarre question, but does it smell? (Like the majority of Chinese-made closed cell foam materials.)**
A: I use it for taxidermy purposes and havent noticed any smell.

**Q: Is product gray or black?**
A: Mine was Gray...

**Q: Can i use that to repair my garage floor cracks with the concrete caulk?**
A: I wouldn’t. It’s just foam. If the crack is huge I would use sand as a filler and apply a deep layer of concrete patch

**Q: does this break down or come apart easily when wet?**
A: No. Its foam.. it doesnt break down at all

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good product
*by C***A on October 8, 2025*

Works very well for what I need.

### ⭐⭐⭐⭐⭐ good quality, good service
*by M***L on November 9, 2024*

I ended up ordering the wrong size for my project and had to return. However, the backer rod seems to be made of high-quality foam, and it feels dense and durable. It has a nice, consistent texture that should be great for filling gaps and joints. I can't speak to how well it works in the long term, but it appears sturdy and like it would do the job as intended. While I didn't end up using the backer rod, Amazon's return service made the process incredibly easy and the refund was instant.

### ⭐⭐⭐⭐⭐ Great price.
*by M***Y on October 23, 2025*

Works great!

## Frequently Bought Together

- M-D Building Products - Versatile Gray Foam Backer Rod - Set 5/8in x 20ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71506)
- 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)
- M-D Building Products 71480 1/2-Inch by 20-Feet Backer Rod, Gray

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*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-03-31*