---
product_id: 270390717
title: "Versatile Gray Foam Backer Rod - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling, 3/8 by 20 Feet (71464)"
brand: "m-d building products"
price: "$35.00"
currency: USD
in_stock: true
reviews_count: 5
url: https://www.desertcart.us/products/270390717-versatile-gray-foam-backer-rod-essential-caulk-saver-for-sealing
store_origin: US
region: United States of America
---

# 20 feet length for extensive coverage Made in USA quality assurance Versatile Gray Foam Backer Rod - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling, 3/8 by 20 Feet (71464)

**Brand:** m-d building products
**Price:** $35.00
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal smarter, not harder — the pro’s secret weapon!

## Quick Answers

- **What is this?** Versatile Gray Foam Backer Rod - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling, 3/8 by 20 Feet (71464) by m-d building products
- **How much does it cost?** $35.00 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/270390717-versatile-gray-foam-backer-rod-essential-caulk-saver-for-sealing)

## 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:** Creates a perfect sound and draft barrier for concrete gaps and expansion joints
- • **Durable & Dependable:** Crafted from resilient gray foam that withstands weather and time
- • **Custom Fit Every Time:** Easily trims with scissors to fit any gap size, even twist multiple rods for larger openings
- • **Versatile Application:** Ideal for driveways, sidewalks, and all your caulking projects
- • **Save Caulk, Save Money:** Acts as an essential caulk saver by providing a solid backing surface

## Overview

The M-D Building Products Versatile Gray Foam Backer Rod is a 3/8-inch by 20-foot foam rod designed to fill and seal large concrete gaps, expansion joints, and cracks. Made in the USA, it provides a durable backing for caulking, preventing drafts and enhancing weatherproofing in driveways, sidewalks, and other construction projects.

## Description

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)

## Features

- This item is a M-D Building Products 71464 Backer Rod For Gaps and Joints, 3/8-by-20 Feet, Gray
- Purpose of use for Hardware, ropes
- This product is manufactured in United States
- Provides a sound surface for caulking projects
- Fills large gaps and openings to prevent drafts.Recommended for use in expansion joints in driveways and sidewalks.Twist multiple strands of cord together for extra large gaps; easily trimmed to size with scissors.3/8-inch by 20 foot

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Asin | B000BQS90G |
| Best Sellers Rank | #446 in Hardware Sealers |
| Date First Available | 17 August 2012 |
| Department | Unisex-Adult |
| Is Discontinued By Manufacturer | No |
| Item Model Number | 71464 |
| Manufacturer | M-D Building Products |
| Product Dimensions | 35.56 x 20.32 x 5.08 cm; 17.01 g |

## Product Details

- **Brand:** M-D Building Products
- **Colour:** Gray
- **Item form:** Foam
- **Item weight:** 0.6 Ounces
- **Maximum gap fill:** 0.38 Inches

## Images

![Versatile Gray Foam Backer Rod - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling, 3/8 by 20 Feet (71464) - Image 1](https://m.media-amazon.com/images/I/61bhNB8Z9UL.jpg)

## Available Options

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

## Questions & Answers

**Q: how many feet come in a 3 pk?**
A: Both INDIVIDUAL packs - the 3/8" and the 1/2"-  are 20 feet long.

**Q: no 1/4" one? either 20 or 50ft?**
A: Not in this brand, but Amazon offers 1/4-inch backer rod in various lengths, from 10 feet to 100 feet, from other brands. Just search on "Backer Rod 1/4 Inch".

**Q: can the backer rod be sliced for smaller openings?**
A: I have not done that, but it cuts easily with a sharp knife or scissors, so you should be able to slice it to fit whatever opening you have. It's good stuff!

**Q: Can his be used for exterior windows before caulking?**
A: I used it to push into larger cracks in my driveway before applying concrete filler, and it worked great. I'm thinking that it should work well for filling in spaces around your windows prior to caulking.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great for posting my Dobermans ears thanks x
*by  on Reviewed in the United Kingdom 30 September 2023*

Great for posting my Dobermans ears thanks x

### ⭐⭐⭐⭐⭐ Good low cost back rod
*by  on Reviewed in the United States 8 April 2026*

Used this foam to seal up the concrete around my 4inch pipe for Radon System before I caulked. I stuffed this around the pipe to fill in the gap and then covered it all with high quality caulk to seal it up perfectly. It worked perfectly and is far cheaper than what i found at my Home Center. Make sure to purchase a thickness that is a little wider than your gap so it make a tight fit.

### ⭐⭐⭐⭐ Very satisfactory
*by  on Reviewed in Canada 13 June 2018*

Good price for the quality of the product. Did the job.

## Frequently Bought Together

- 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 - Versatile Gray Foam Backer Rod Set 1/2in x 20ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71480)
- 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 United States of America*
*Store origin: US*
*Last updated: 2026-08-25*