---
product_id: 5587474
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: "307406₫"
currency: VND
in_stock: true
reviews_count: 8
category: "M D Building Products"
url: https://www.desertcart.vn/products/5587474-versatile-gray-foam-backer-rod-essential-caulk-saver-for-sealing
store_origin: VN
region: Vietnam
---

# Easily trimmed to fit any joint size Waterproof foam ensures weather resistance 3/8 inch diameter for precise gap filling 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:** 307406₫
**Availability:** ✅ In Stock

## Summary

> 🛡️ Seal smart, save energy, and stay ahead of the weather!

## 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?** 307406₫ 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/5587474-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

- • **Multi-Use Mastery:** Ideal for concrete joints, window sills, doors, and draft-proofing your entire home
- • **Cut-to-Size Convenience:** Trim with scissors for a custom fit—no waste, no hassle
- • **Effortless Installation:** Push-in design means no messy adhesives or complicated tools required
- • **Precision Fit, Every Time:** 3/8 inch diameter perfectly fills medium gaps for airtight seals
- • **Built to Brave the Elements:** Waterproof, weather-resistant foam guarantees long-lasting outdoor durability

## 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 medium gaps in concrete, expansion joints, and cracks. Its weather-resistant construction ensures durability indoors and outdoors, while its easy-to-trim and push-in installation makes it the essential caulk saver for professional-grade airtightness and draft prevention.

## Description

desertcart.com: 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) : Industrial & Scientific

Review: good product - worked perfectly
Review: Works like a charm - Made up 20F difference before and after. I inserted this into a narrow gap between baseboard and floor. Wish I could've got 0.5', but a couple of go for this worked perfectly as well.

## 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 | 0.6 Ounces |
| Surface Recommendation | wall |
| Water Resistance Level | Waterproof |

## 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

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

worked perfectly

### ⭐⭐⭐⭐⭐ Works like a charm
*by D***I on January 7, 2026*

Made up 20F difference before and after. I inserted this into a narrow gap between baseboard and floor. Wish I could've got 0.5', but a couple of go for this worked perfectly as well.

### ⭐⭐⭐⭐⭐ Good product
*by K***. on March 25, 2025*

Works well. I bought it to fill in gaps in my driveway. For the smaller cracks I cut the width of it. It is durable and a good price.

## 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 Vietnam*
*Store origin: VN*
*Last updated: 2026-02-11*