---
product_id: 270390717
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: "874431₫"
currency: VND
in_stock: true
reviews_count: 5
category: "M D Building Products"
url: https://www.desertcart.vn/products/270390717-m-d-building-products-versatile-gray-foam-backer-rod-essential
store_origin: VN
region: Vietnam
---

# Waterproof foam material 3/8-inch gap fill precision 20 feet versatile length 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:** 874431₫
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal smarter, save bigger — the pro’s secret to flawless finishes!

## 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?** 874431₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/270390717-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

- • **Extended Reach:** Generous 20-foot length ensures you have enough material for multiple projects or large surfaces.
- • **Customizable Fit:** Easily trimmed and twisted for larger gaps, giving you tailored control over every seal.
- • **Precision Gap Filler:** Perfectly sized 3/8-inch diameter to seal and insulate with professional accuracy.
- • **Durable Waterproof Foam:** Crafted from resilient rubber foam that blocks drafts and moisture, enhancing longevity.
- • **Multipurpose Sealant Base:** Ideal for concrete cracks, expansion joints, driveways, and sidewalks—your go-to caulk saver.

## Overview

The M-D Building Products Versatile Gray Foam Backer Rod is a 3/8-inch diameter, 20-foot long waterproof foam rod designed to fill and seal concrete gaps, expansion joints, and cracks. Made in the USA from durable rubber foam, it provides a sound surface for caulking, prevents drafts, and is easily trimmed or twisted for custom applications. Trusted by professionals and DIYers alike, it’s an essential tool for weatherproofing and extending the life of your concrete surfaces.

## 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)

Review: Great for posting my Dobermans ears thanks x
Review: good product

## 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 | #69,639 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #415 in Hardware Sealers |
| Brand | M-D Building Products |
| Brand Name | M-D Building Products |
| Color | Gray |
| Colour | Gray |
| Customer Reviews | 4.6 out of 5 stars 1,522 Reviews |
| Global Trade Identification Number | 00043374714647 |
| Included Components | MD Building - 71464 - 2pk |
| Item Form | Foam |
| Item Type Name | MD Building - 71464 - 2pk |
| Item Weight | 0.6 Ounces |
| Item form | Foam |
| Item height | 2 inches |
| Item weight | 0.6 Ounces |
| Manufacturer | M-D Building Products |
| Material Type | Rubber |
| Maximum Gap Fill | 0.38 Inches |
| Maximum gap fill | 0.38 Inches |
| Surface Recommendation | wall |
| Surface recommendation | wall |
| UPC | 043374714647 |
| Unit Count | 1 Count |
| 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. |
| Water Resistance Level | Waterproof |

## 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)

## 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 B***S on 30 September 2023*



### ⭐⭐⭐⭐⭐ good product
*by A***E on 6 January 2026*



### ⭐⭐⭐⭐⭐ Use THESE, not spray foam
*by M***Y on 24 October 2025*



## 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

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.vn/products/270390717-m-d-building-products-versatile-gray-foam-backer-rod-essential](https://www.desertcart.vn/products/270390717-m-d-building-products-versatile-gray-foam-backer-rod-essential)

---

*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-02-10*