---
product_id: 127119740
title: "M-D Building Products - Versatile Gray Foam Backer Rod - Set 3/8in x 350ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71550)"
brand: "m-d building products"
price: "₪54"
currency: ILS
in_stock: true
reviews_count: 8
url: https://www.desertcart.co.il/products/127119740-m-d-building-products-versatile-gray-foam-backer-rod-set
store_origin: IL
region: Israel
---

# Waterproof foam for all-weather durability 350ft continuous length for extensive projects 3/8in thickness for perfect medium gaps M-D Building Products - Versatile Gray Foam Backer Rod - Set 3/8in x 350ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71550)

**Brand:** m-d building products
**Price:** ₪54
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal smart, save energy, and upgrade your space effortlessly!

## Quick Answers

- **What is this?** M-D Building Products - Versatile Gray Foam Backer Rod - Set 3/8in x 350ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71550) by m-d building products
- **How much does it cost?** ₪54 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.il](https://www.desertcart.co.il/products/127119740-m-d-building-products-versatile-gray-foam-backer-rod-set)

## 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

- • **Extended Reach:** 350ft roll covers large-scale sealing jobs without interruption.
- • **Multi-Use Mastery:** Ideal for concrete joints, window sills, doors, and expansion gaps—your all-in-one caulk base.
- • **Precision Gap Filler:** Engineered 3/8in foam fits snugly to block drafts and dust.
- • **Effortless Installation:** Push-in design means no adhesives or mess—seal like a pro in minutes.
- • **Weatherproof Resilience:** Durable waterproof material stands up to rain, sun, and cold.

## Overview

The M-D Building Products Versatile Gray Foam Backer Rod is a 3/8-inch thick, 350-foot long waterproof foam designed to fill medium-sized gaps in concrete, doors, and expansion joints. Its durable, weather-resistant construction ensures long-lasting insulation and draft prevention, making it an essential caulk saver for both indoor and outdoor sealing projects.

## Description

desertcart.com: M-D Building Products - Versatile Gray Foam Backer Rod - Set 3/8in x 350ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71550) : 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 | 1 Pounds |
| Surface Recommendation | Door |
| Water Resistance Level | Waterproof |

## Product Details

- **Color:** Gray
- **Brand:** M-D Building Products
- **Item Form:** Foam
- **Surface Recommendation:** Door
- **Water Resistance Level:** Waterproof

## Images

![M-D Building Products - Versatile Gray Foam Backer Rod - Set 3/8in x 350ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71550) - Image 1](https://m.media-amazon.com/images/I/61bhNB8Z9UL.jpg)
![M-D Building Products - Versatile Gray Foam Backer Rod - Set 3/8in x 350ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71550) - Image 2](https://m.media-amazon.com/images/I/71JiZXfhw2L.jpg)
![M-D Building Products - Versatile Gray Foam Backer Rod - Set 3/8in x 350ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71550) - Image 3](https://m.media-amazon.com/images/I/81-xBTntOuL.jpg)
![M-D Building Products - Versatile Gray Foam Backer Rod - Set 3/8in x 350ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71550) - Image 4](https://m.media-amazon.com/images/I/818J6gOM3ZL.jpg)
![M-D Building Products - Versatile Gray Foam Backer Rod - Set 3/8in x 350ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71550) - Image 5](https://m.media-amazon.com/images/I/81Py1S2524L.jpg)

## Available Options

This product comes in different **Size, Style** options.

## 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 - Set 3/8in x 350ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71550)
- M-D Building Products 71480 1/2-Inch by 20-Feet Backer Rod, Gray
- M-D Building Products - Versatile Gray Foam Backer Rod - Set 5/8in x 150ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71552)

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*Product available on Desertcart Israel*
*Store origin: IL*
*Last updated: 2026-01-26*