---
product_id: 5587474
title: "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 (71464)"
brand: "m-d building products"
price: "138 DH"
currency: MAD
in_stock: true
reviews_count: 8
url: https://www.desertcart.ma/products/5587474-m-d-building-products-versatile-gray-foam-backer-rod-essential
store_origin: MA
region: Morocco
---

# Easily trim to size Weather-resistant durability 3/8 inch perfect gap fit 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 (71464)

**Brand:** m-d building products
**Price:** 138 DH
**Availability:** ✅ In Stock

## Summary

> 🛡️ Seal smart, live comfortable—don’t let gaps steal your peace!

## Quick Answers

- **What is this?** 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 (71464) by m-d building products
- **How much does it cost?** 138 DH with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ma](https://www.desertcart.ma/products/5587474-m-d-building-products-versatile-gray-foam-backer-rod-essential)

## 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

- • **Customizable Length:** Trim or twist to perfectly match any gap size—tailored protection every time.
- • **Precision Gap Filler:** Seamlessly fills medium concrete gaps for flawless caulking adhesion.
- • **Versatile Home Armor:** Ideal for sealing expansion joints, drafty doors, windows, and even leaky roofs.
- • **All-Weather Resilience:** Engineered to withstand rain, sun, and temperature swings without losing integrity.
- • **Effortless Installation:** Push-in design means no mess, no fuss—get a snug fit in seconds.

## Overview

The M-D Building Products Versatile Gray Foam Backer Rod is a 3/8-inch diameter, 20-foot long, closed-cell polyethylene foam designed to fill and seal medium gaps in concrete, expansion joints, and cracks. Weather-resistant and easy to install, it provides a durable base for caulking, enhancing airtightness and insulation for both indoor and outdoor applications.

## Description

Full description not available

## 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 |
|---------------|-------|
| Manufacturer | M-D Building Products |
| Part Number | 71464 |
| Item Weight | 0.6 ounces |
| Product Dimensions | 14 x 8 x 2 inches |
| Item model number | 71464 |
| Is Discontinued By Manufacturer | No |
| Size | 20 Ft. |
| Color | Black |
| Style | Backer Rod |
| Material | Rubber |
| Pattern | Solid |
| Shape | Round |
| Item Package Quantity | 1 |
| Number Of Pieces | 1 |
| Measurement System | US |
| Certification | Non-absorbent, closed-cell polyethylene pre-caulking material |
| Included Components | MD Building - 71464 - 2pk |
| Batteries Included? | No |
| Batteries Required? | No |
| Warranty Description | All M-D products are warranted to be free from defects in material and workmanship if installed and used in strict accordance with our installation instructions. Our liability is limited to our sale price of any products proved to be defective or, at our option, to the replacement of such products upon their return to us. |

## Images

![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 (71464) - Image 1](https://m.media-amazon.com/images/I/61bhNB8Z9UL.jpg)
![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 (71464) - Image 2](https://m.media-amazon.com/images/I/71glyJQDg0L.jpg)
![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 (71464) - Image 3](https://m.media-amazon.com/images/I/818J6gOM3ZL.jpg)
![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 (71464) - Image 4](https://m.media-amazon.com/images/I/81Py1S2524L.jpg)
![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 (71464) - Image 5](https://m.media-amazon.com/images/I/81-xBTntOuL.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

### ⭐⭐⭐⭐⭐ Does the job!
*by S***. on June 21, 2025*

Good products at good prices

### ⭐⭐⭐⭐⭐ Good product
*by T***E on July 28, 2025*

Good product

### ⭐⭐⭐⭐⭐ Great for threshold gaps
*by B***E on July 22, 2024*

Had a small gap in my front door threshold after one of our animals ripped up the material that was originally in the gap.After reading many reviews for this product, gave it a shot. It was just what I needed! Super easy to use: measure, cut, install. Fits perfectly in the gap. No need to worry about dirt, bugs, and other debris getting in the gap.Great value too, as the 20ft bag was only about $3.00, with plenty left over if I need to replace it again.Highly recommend.

## 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 Morocco*
*Store origin: MA*
*Last updated: 2026-01-26*