---
product_id: 38638724
title: "M-D Building Products - Versatile Gray Foam Backer Rod - Set 1/2in x 250ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71551)"
brand: "m-d building products"
price: "31.29 OMR"
currency: OMR
in_stock: true
reviews_count: 3
category: "M D Building Products"
url: https://www.desertcart.com.om/products/38638724-m-d-building-products-versatile-gray-foam-backer-rod-set
store_origin: OM
region: Oman
---

# 0.5in max gap fill easy trim-to-fit weather-resistant durability M-D Building Products - Versatile Gray Foam Backer Rod - Set 1/2in x 250ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71551)

**Brand:** m-d building products
**Price:** 31.29 OMR
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal smarter, save bigger—your gap-filling game changer!

## Quick Answers

- **What is this?** M-D Building Products - Versatile Gray Foam Backer Rod - Set 1/2in x 250ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71551) by m-d building products
- **How much does it cost?** 31.29 OMR with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.om](https://www.desertcart.com.om/products/38638724-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:** Effortlessly fills and seals medium gaps up to 1/2 inch for airtight, draft-proof spaces.
- • **Cut to Your Command:** Trim or twist the foam rod to perfectly fit any joint size—custom sealing made simple.
- • **Versatile Home Armor:** Ideal for concrete, doors, windows, and expansion joints—boost insulation and block drafts with ease.
- • **Caulk Saver Extraordinaire:** Creates a sturdy base that reduces caulk usage, saving money and minimizing waste on every project.
- • **Built to Brave the Elements:** Crafted from premium weather-resistant foam that stands strong indoors and out, rain or shine.

## Overview

The M-D Building Products Versatile Gray Foam Backer Rod is a 1/2 inch thick, 250-foot long weather-resistant foam designed to fill and seal medium gaps in concrete, doors, windows, and expansion joints. It enhances caulking durability, reduces material waste, and improves insulation for both indoor and outdoor applications.

## Description

desertcart.com: M-D Building Products - Versatile Gray Foam Backer Rod - Set 1/2in x 250ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71551) : Industrial & Scientific

Review: makes great insulation - closed in a screened deck and made a glassed in sunroom. Used backer rod to fill in the gaps between deck boards. I'm relatively sure the rod doesn't have a large R value, but it stopped the wind from blowing through the floor. It did make it possible to heat the room with a mini-split (which is not overloaded). It has kept the sunroom quite comfortable during winter (temps down to 8F). If it works as well in the summer heat, I'll give it high marks as an insulator.
Review: Great as always - A must-have for any caulking or sealing job. Reduces the amount of product you need to waste by filling in the empty holes.

## 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 |
|---------------|-------|
| Brand | M-D Building Products |
| Color | Gray |
| Item Form | Foam |
| Item Weight | 0.01 Ounces |
| Maximum Gap Fill | 0.5 Inches |
| Surface Recommendation | Concrete, Door, Walls, Window |

## Product Details

- **Color:** Gray
- **Brand:** M-D Building Products
- **Item Weight:** 0.01 Ounces
- **Item Form:** Foam
- **Maximum Gap Fill:** 0.5 Inches

## Images

![M-D Building Products - Versatile Gray Foam Backer Rod - Set 1/2in x 250ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71551) - Image 1](https://m.media-amazon.com/images/I/61UnawlcwQL.jpg)
![M-D Building Products - Versatile Gray Foam Backer Rod - Set 1/2in x 250ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71551) - Image 2](https://m.media-amazon.com/images/I/81-xBTntOuL.jpg)
![M-D Building Products - Versatile Gray Foam Backer Rod - Set 1/2in x 250ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71551) - Image 3](https://m.media-amazon.com/images/I/818J6gOM3ZL.jpg)
![M-D Building Products - Versatile Gray Foam Backer Rod - Set 1/2in x 250ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71551) - Image 4](https://m.media-amazon.com/images/I/81Py1S2524L.jpg)
![M-D Building Products - Versatile Gray Foam Backer Rod - Set 1/2in x 250ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71551) - Image 5](https://m.media-amazon.com/images/I/81g6uTEnFEL.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

### ⭐⭐⭐⭐⭐ makes great insulation
*by N***D on January 24, 2025*

closed in a screened deck and made a glassed in sunroom. Used backer rod to fill in the gaps between deck boards. I'm relatively sure the rod doesn't have a large R value, but it stopped the wind from blowing through the floor. It did make it possible to heat the room with a mini-split (which is not overloaded). It has kept the sunroom quite comfortable during winter (temps down to 8F). If it works as well in the summer heat, I'll give it high marks as an insulator.

### ⭐⭐⭐⭐⭐ Great as always
*by L***A on December 1, 2024*

A must-have for any caulking or sealing job. Reduces the amount of product you need to waste by filling in the empty holes.

### ⭐⭐⭐⭐⭐ No more drafts
*by A***N on October 14, 2019*

We used it in more areas than we thought we would. Perfect for all the little insulation projects!

## Frequently Bought Together

- M-D Building Products - Versatile Gray Foam Backer Rod - Set 1/2in x 250ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71551)
- M-D Building Products - Versatile Gray Foam Backer Rod - Set 3/8in x 350ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71550)
- zzhxkjhky 3/4' Diameter x 80' Length Backer Rod Caulk Saver Foam Backer Rod for Gaps and Joints Backing Concrete Filler

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*Product available on Desertcart Oman*
*Store origin: OM*
*Last updated: 2026-01-27*