---
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: "AR$1121"
currency: ARS
in_stock: false
url: https://www.desertcart.com.ar/products/270390717-m-d-building-products-versatile-gray-foam-backer-rod-essential
store_origin: AR
region: Argentina
---

# 3/8-inch diameter precision 20 feet versatile length Made in USA quality 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:** AR$1121
**Availability:** ❌ Out of Stock

## Summary

> 🛠️ Seal Smart, Save Big – 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?** AR$1121 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/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

- • **Long-Lasting Coverage:** Generous 20-foot length ensures you have enough material to tackle multiple projects without constant reordering.
- • **Draft-Proof Your Space:** Effectively fills large gaps and expansion joints to prevent drafts, enhancing energy efficiency and comfort.
- • **Perfect Fit, Every Time:** Precisely sized 3/8-inch diameter for seamless gap filling and professional-grade caulking support.
- • **Customizable & Easy to Use:** Easily trimmed with scissors and twistable for extra-large gaps, giving you ultimate control and flexibility.
- • **Trusted American Craftsmanship:** Manufactured in the USA with durable, closed-cell polyethylene foam for reliable, non-absorbent performance.

## Overview

The M-D Building Products Versatile Gray Foam Backer Rod is a 3/8-inch diameter, 20-foot long closed-cell polyethylene foam rod designed to provide a sound surface for caulking in concrete gaps, expansion joints, and crack filling. Made in the USA, it prevents drafts, improves energy efficiency, and is easily trimmed or twisted for custom applications, making it an essential tool for professional and DIY weatherization 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 |
|---------------|-------|
| Manufacturer | M-D Building Products |
| Part number | 71464 |
| Item Weight | 17 g |
| Product Dimensions | 35.56 x 20.32 x 5.08 cm; 17.01 g |
| Item model number | 71464 |
| 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 |
| Specification met | Non-absorbent, closed-cell polyethylene pre-caulking material |
| Included components | MD Building - 71464 - 2pk |
| Batteries Included? | No |
| Batteries Required? | No |

## 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)

## 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.

## 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 Argentina*
*Store origin: AR*
*Last updated: 2026-01-22*