---
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: "€ 25.74"
currency: EUR
in_stock: false
url: https://www.desertcart.hr/products/5587474-versatile-gray-foam-backer-rod-essential-caulk-saver-for-sealing
store_origin: HR
region: Croatia
---

# Easily trim to fit any joint size Weather-resistant & waterproof 3/8 inch diameter for medium gaps 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:** € 25.74
**Availability:** ❌ Out of Stock

## Summary

> 🔧 Seal smarter, not harder — the pro’s choice for flawless gaps!

## 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?** € 25.74 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/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

- • **Trusted Caulk Base:** Creates a reliable foundation for caulking that lasts, saving you time and money on repairs.
- • **Effortless Installation:** Push in place and trim with scissors—no adhesives or mess required.
- • **Durable Weatherproof Seal:** Built to withstand rain, sun, and temperature swings for year-round protection.
- • **Precision Fit for Medium Gaps:** 3/8 inch thickness ensures a snug, draft-blocking fit in concrete and expansion joints.
- • **Versatile Indoor & Outdoor Use:** Perfect for sealing windows, doors, driveways, and more, enhancing insulation and comfort.

## Overview

The M-D Building Products Versatile Gray Foam Backer Rod is a 3/8 inch thick, 20-foot long foam rod designed to fill medium-sized gaps and expansion joints. Made from durable, weather-resistant rubber foam, it provides a waterproof, airtight base for caulking applications both indoors and outdoors. Easy to install and trim, it prevents drafts, dust, and moisture infiltration, enhancing insulation and extending the life of your sealants.

## 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

## 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 |
|---------------|-------|
| ASIN | B000BQS90G |
| Best Sellers Rank | #54,564 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #9 in Rope Caulk #346 in Industrial Sealants #29,621 in Hardware |
| Brand | M-D Building Products |
| Brand Name | M-D Building Products |
| Color | Gray |
| Customer Reviews | 4.6 out of 5 stars 1,657 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 |
| Manufacturer | M-D Building Products |
| Material Type | Rubber |
| Model | 71464 |
| Number of Items | 1 |
| Part Number | 71464 |
| Surface Recommendation | surface_recommendation |
| UPC | 043374714647 |
| Unit Count | 1.0 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 |

## Product Details

- **Brand:** M-D Building Products
- **Color:** Gray
- **Item Form:** Foam
- **Item Weight:** 0.6 Ounces
- **Surface Recommendation:** surface_recommendation

## 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)
![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)
![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)
![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)
![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.

## 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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**Shop now:** [https://www.desertcart.hr/products/5587474-versatile-gray-foam-backer-rod-essential-caulk-saver-for-sealing](https://www.desertcart.hr/products/5587474-versatile-gray-foam-backer-rod-essential-caulk-saver-for-sealing)

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-07-16*