---
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: "R$120"
currency: BRL
in_stock: true
category: "M D Building Products"
url: https://www.desertcart.com.br/products/4877844-m-d-building-products-versatile-gray-foam-backer-rod-set
store_origin: BR
region: Brazil
---

# Easily trim to size Waterproof & weather-resistant 0.5in max gap fill 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:** R$120
**Availability:** ✅ In Stock

## Summary

> 🛡️ Seal smart, save energy, and upgrade your space effortlessly!

## 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?** R$120 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/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

- • **Effortless Custom Fit:** Trim or twist to perfectly match any joint or crack size
- • **Precision Gap Filling:** Seals up to 0.5-inch gaps for airtight, draft-free spaces
- • **Universal Application:** Ideal for concrete, expansion joints, window sills, and more—indoor or outdoor
- • **Weatherproof Durability:** Built to withstand rain, sun, and temperature swings without degrading
- • **Quick & Clean Installation:** Push in place and caulk over—no messy adhesives needed

## Overview

The Versatile Gray Foam Backer Rod Set by M-D Building Products is a 20ft roll of high-quality, waterproof foam designed to fill and seal gaps up to 0.5 inches. Perfect for concrete joints, expansion gaps, and crack filling, it enhances caulking durability and energy efficiency. Easy to trim and install, it’s a must-have for professionals and DIYers aiming for long-lasting, weather-resistant seals indoors and outdoors.

## 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

## 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 | #1,639 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #16 in Weather Stripping |
| Brand Name | M-D Building Products |
| Color | Gray |
| Customer Reviews | 4.6 4.6 out of 5 stars (3,950) |
| Global Trade Identification Number | 00043374714807 |
| Included Components | 1 Foam Backer Rod Roll |
| Item Form | Specialty |
| Item Type Name | Backer Rod |
| Item Weight | 0.02 Pounds |
| Manufacturer | M-D Building Products |
| Material Type | Foam |
| Maximum Gap Fill | 0.5 Inches |
| Model | 71480 |
| Number of Items | 1 |
| Part Number | 71480 |
| 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)

## 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.

## 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 Brazil*
*Store origin: BR*
*Last updated: 2026-07-06*