---
product_id: 38638724
title: "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: "€ 107.77"
currency: EUR
in_stock: true
reviews_count: 4
category: "M D Building Products"
url: https://www.desertcart.fi/products/38638724-versatile-gray-foam-backer-rod-set-1-2in-x-250ft
store_origin: FI
region: Finland
---

# 35 PSI tensile strength 250ft continuous length 0.5in max gap fill 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:** € 107.77
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal smarter, save bigger — the ultimate gap-filler for the savvy pro!

## Quick Answers

- **What is this?** 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?** € 107.77 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/38638724-versatile-gray-foam-backer-rod-set-1-2in-x-250ft)

## 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, Twist, Fit:** Customizable length and shape for perfect fit in expansion joints, cracks, and crevices.
- • **Seal Like a Pro:** Effortlessly fills and seals medium gaps up to 1/2 inch for airtight, draft-proof spaces.
- • **Multi-Use Home Hero:** Ideal for insulating, damp-proofing, and sealing concrete, doors, windows, and more.
- • **Caulk Saver Extraordinaire:** Reduces caulk usage by filling voids, saving money and minimizing waste on every project.
- • **Endurance Meets Versatility:** Weather-resistant foam built to withstand indoor and outdoor elements year-round.

## Overview

The M-D Building Products Versatile Gray Foam Backer Rod is a 250-foot long, 1/2-inch diameter foam rod designed to fill and seal medium gaps in concrete, expansion joints, and cracks. Made from durable, weather-resistant materials with a tensile strength of 35 PSI, it provides a reliable base for caulking, improves insulation, and prevents drafts both indoors and outdoors. Easy to install and customizable by trimming or twisting, it’s a cost-effective solution that enhances airtightness and protects your home from the elements.

## 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 |
|---------------|-------|
| ASIN | B00C1TGKZW |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #731,829 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #884 in Adhesive Caulk #1,454 in Industrial Sealants #157,925 in Hardware |
| Brand | M-D Building Products |
| Color | Gray |
| Customer Reviews | 4.4 4.4 out of 5 stars (80) |
| Date First Available | March 27, 2013 |
| Global Trade Identification Number | 00043374715514 |
| Included Components | MD Building - 71551 |
| Is Discontinued By Manufacturer | No |
| Item Form | Foam |
| Item Package Quantity | 1 |
| Item Weight | 0.01 ounces |
| Item model number | MD Building - 71551 |
| Manufacturer | M-D Building Products |
| Material | Aluminum |
| Maximum Gap Fill | 0.5 Inches |
| Measurement System | Inch |
| Mounting Type | Wall |
| Number Of Pieces | 1 |
| Number of Items | 1 |
| Part Number | 4962239 |
| Pattern | Solid |
| Product Dimensions | 13 x 10 x 10 inches |
| Shape | Round |
| Size | 250 Ft. |
| Style | 250 Ft |
| Surface Recommendation | Concrete, Door, Walls, Window |
| Tensile Strength | 35 Pounds Per Square Inch |
| UPC | 043374715514 |
| Unit Count | 1.0 Count |
| Water Resistance Level | Waterproof |

## Product Details

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

## Images

![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)

## 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 Finland*
*Store origin: FI*
*Last updated: 2026-02-11*