---
product_id: 5587474
title: "MD Building Foam Backer Rod, Gray, 3/8in x 20ft for Small Gaps"
brand: "m-d building products"
price: "AR$50135"
currency: ARS
in_stock: true
category: "M D Building Products"
url: https://www.desertcart.com.ar/products/5587474-md-building-foam-backer-rod-gray-3-8in-x-20ft
store_origin: AR
region: Argentina
---

# Easily trims with scissors Weather-resistant & waterproof 3/8in x 20ft perfect gap size MD Building Foam Backer Rod, Gray, 3/8in x 20ft for Small Gaps

**Brand:** m-d building products
**Price:** AR$50135
**Availability:** ✅ In Stock

## Summary

> 🔧 Seal Smart, Save Big: The Pro’s Choice for Flawless Gaps!

## Quick Answers

- **What is this?** MD Building Foam Backer Rod, Gray, 3/8in x 20ft for Small Gaps by m-d building products
- **How much does it cost?** AR$50135 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/5587474-md-building-foam-backer-rod-gray-3-8in-x-20ft)

## 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

- • **Caulk Waste Reduction:** Creates a reliable base that prevents caulk overuse, saving money and ensuring a clean finish.
- • **Effortless Installation:** Push-in design fits most joints instantly—no adhesives or messy sealants required.
- • **Durable Weatherproof Design:** Crafted from closed-cell foam that resists moisture and harsh outdoor elements without degrading.
- • **Precision Fit for Small Gaps:** Snugly seals medium joints to block drafts, dust, and insects for year-round comfort.
- • **Versatile Indoor & Outdoor Use:** Ideal for driveways, window sills, doors, and roofs—your all-in-one gap sealing solution.

## Overview

The MD Building Foam Backer Rod is a 3/8-inch by 20-foot closed-cell foam strip designed to fill and seal small to medium gaps indoors and outdoors. Its weather-resistant, waterproof rubber material ensures long-lasting durability while preventing drafts, moisture, dust, and insects. Easy to trim and install, it provides a sturdy base for caulking, reducing waste and enhancing adhesion for professional-grade sealing and insulation.

## Description

desertcart.com: MD Building Foam Backer Rod, Gray, 3/8in x 20ft for Small Gaps | Closed-Cell Foam, Prevents Caulk Waste, Cuts With Scissors, Blocks Drafts Moisture Dust Insects, Indoor/Outdoor : 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 | #2,540 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Rope Caulk #30 in Industrial Sealants #1,153 in Hardware |
| Brand | M-D Building Products |
| Brand Name | M-D Building Products |
| Color | Gray |
| Customer Reviews | 4.6 out of 5 stars 1,666 Reviews |
| Global Trade Identification Number | 00043374714647 |
| Included Components | MD Building - 71464 - 2pk |
| Item Form | Foam |
| Item Highlight | Closed-Cell Foam, Prevents Caulk Waste, Cuts With Scissors, Blocks Drafts Moisture Dust Insects, Indoor/Outdoor |
| Item Type Name | MD Building - 71464 - 2pk |
| Item Weight | 17.01 g |
| Manufacturer | M-D Building Products |
| Material Type | Rubber |
| Model | 71464 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Part Number | 71464 |
| Surface Recommendation | surface_recommendation |
| 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 |

## Product Details

- **Brand:** M-D Building Products
- **Color:** Gray
- **Item Form:** Foam
- **Item Weight:** 17.01 g
- **Surface Recommendation:** surface_recommendation

## Images

![MD Building Foam Backer Rod, Gray, 3/8in x 20ft for Small Gaps - Image 1](https://m.media-amazon.com/images/I/61bhNB8Z9UL.jpg)
![MD Building Foam Backer Rod, Gray, 3/8in x 20ft for Small Gaps - Image 2](https://m.media-amazon.com/images/I/71glyJQDg0L.jpg)
![MD Building Foam Backer Rod, Gray, 3/8in x 20ft for Small Gaps - Image 3](https://m.media-amazon.com/images/I/818J6gOM3ZL.jpg)
![MD Building Foam Backer Rod, Gray, 3/8in x 20ft for Small Gaps - Image 4](https://m.media-amazon.com/images/I/81Py1S2524L.jpg)
![MD Building Foam Backer Rod, Gray, 3/8in x 20ft for Small Gaps - 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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*Product available on Desertcart Argentina*
*Store origin: AR*
*Last updated: 2026-09-20*