---
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: "4546 kr"
currency: ISK
in_stock: true
reviews_count: 5
category: "M D Building Products"
url: https://www.desertcart.is/products/270390717-m-d-building-products-versatile-gray-foam-backer-rod-essential
store_origin: IS
region: Iceland
---

# 20 feet length for extensive coverage Made in USA quality assurance 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:** 4546 kr
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal smarter, save bigger – the ultimate caulk saver for 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?** 4546 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/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

- • **Cut to Fit:** Easily trimmed with scissors for custom sizing on any project.
- • **Seal Like a Pro:** Perfectly fills large gaps and expansion joints to block drafts and moisture.
- • **Trusted Quality:** Manufactured in the USA with a 4.6-star rating from over 1,500 satisfied users.
- • **Durable & Reliable:** Closed-cell polyethylene foam resists absorption, ensuring long-lasting performance.
- • **Versatile Application:** Ideal for concrete cracks, driveways, sidewalks, and window or door frames.

## 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 fill large gaps and expansion joints. Made in the USA, it provides a durable, non-absorbent surface that enhances caulking efficiency and insulation in concrete, driveways, sidewalks, and window or door cracks. Highly rated for its ease of use and reliable performance, it’s a must-have for professional-grade weatherization and sealing 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)

Review: Great for posting my Dobermans ears thanks x
Review: Stuffs easily into door and window cracks to provide insulation in irregular sized gaps. And works well as intended caulk saver for large cracks.

## 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 |
| ASIN  | B000BQS90G |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #28,387 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #164 in Hardware Sealers |
| Color | Gray |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,527) |
| Customer reviews | 4.6 4.6 out of 5 stars (1,527) |
| Date First Available | 17 August 2012 |
| Date First Available  | 17 August 2012 |
| Department  | Unisex-Adult |
| Included components | MD Building - 71464 - 2pk |
| Is Discontinued By Manufacturer  | No |
| Item Package Quantity | 1 |
| Item Weight | 17 g |
| Item model number | 71464 |
| Item model number  | 71464 |
| Manufacturer | M-D Building Products |
| Manufacturer  | M-D Building Products |
| Material | Rubber |
| Measurement System | US |
| Number Of Pieces | 1 |
| Part number | 71464 |
| Pattern | Solid |
| Product Dimensions | 35.56 x 20.32 x 5.08 cm; 17.01 g |
| Product Dimensions  | 35.56 x 20.32 x 5.08 cm; 17.01 g |
| Shape | Round |
| Size | 20 Ft. |
| Specification met | Non-absorbent, Closed-cell Polyethylene Pre-caulking Material |
| Style | Backer Rod |

## Product Details

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

## 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

### ⭐⭐⭐⭐⭐ Review
*by B***S on 30 September 2023*

Great for posting my Dobermans ears thanks x

### ⭐⭐⭐⭐⭐ Review
*by M***N on 8 February 2026*

Stuffs easily into door and window cracks to provide insulation in irregular sized gaps. And works well as intended caulk saver for large cracks.

### ⭐⭐⭐⭐⭐ Review
*by M***Y on 24 October 2025*

Sometimes caulking or spray foam is not appropriate for the job, and is an excellent permanent base fix prior to caulking. Creates no pressure on door and window frames

## 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 Iceland*
*Store origin: IS*
*Last updated: 2026-03-04*