---
product_id: 4320311
title: "MD Building Foam Backer Rod, Gray, 20ft x 5/8in for Large Gaps"
brand: "m-d building products"
price: "4665 som"
currency: KGS
in_stock: true
reviews_count: 13
url: https://www.desertcart.kg/products/4320311-md-building-foam-backer-rod-gray-20ft-x-5-8in
store_origin: KG
region: Kyrgyzstan
---

# Easily trims to fit any gap Waterproof closed-cell foam 20ft length for extensive coverage MD Building Foam Backer Rod, Gray, 20ft x 5/8in for Large Gaps

**Brand:** m-d building products
**Price:** 4665 som
**Availability:** ✅ In Stock

## Summary

> 🛡️ Seal the deal with MD Building Foam — your gap’s new best friend!

## Quick Answers

- **What is this?** MD Building Foam Backer Rod, Gray, 20ft x 5/8in for Large Gaps by m-d building products
- **How much does it cost?** 4665 som with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/products/4320311-md-building-foam-backer-rod-gray-20ft-x-5-8in)

## 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

- • **Built to Last:** Weather-resistant foam ensures durable indoor/outdoor performance
- • **Seal Like a Pro:** Blocks drafts, moisture, dust, and insects for year-round comfort
- • **Perfect Fit Every Time:** Flexible and easily trimmed to fill medium to large gaps flawlessly
- • **Versatile Gap Solution:** Ideal for driveways, windows, doors, roofs, and more—your all-in-one sealant partner
- • **Caulk Smarter, Not Harder:** Creates a strong base to prevent caulk waste and cracking

## Overview

The MD Building Foam Backer Rod is a 20ft long, 5/8in thick closed-cell foam designed to fill medium to large gaps indoors and outdoors. Waterproof and weather-resistant, it prevents drafts, moisture, dust, and insects while providing a sturdy base for caulking projects. Easy to trim and install, it enhances insulation and durability across various surfaces, making it a top-rated, versatile solution for professional-grade weatherization.

## Description

desertcart.com: MD Building Foam Backer Rod, Gray, 20ft x 5/8in for Large Gaps | Closed-Cell Foam, Prevents Caulk Waste, Cuts With Scissors, Blocks Drafts Moisture Dust Insects, Indoor/Outdoor : Industrial & Scientific

Review: Perfect for Packing Large Gaps Before Caulking - Really happy with this foam backer rod. It arrived right on time and in perfect condition, no damage at all to the packaging. Works exactly as described and made packing large gaps before caulking so much easier. Great quality material and easy to use. Would definitely buy again for future projects.
Review: Excellent - Excellant

## 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 | B000BQP1D4 |
| Best Sellers Rank | #1,424 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #68 in Hardware Sealers |
| Brand | M-D Building Products |
| Brand Name | M-D Building Products |
| Color | Gray |
| Customer Reviews | 4.6 out of 5 stars 5,394 Reviews |
| Global Trade Identification Number | 00043374715064 |
| Included Components | MD Building - 71506 |
| Item Form | Foam |
| Item Type Name | MD Building - 71506 |
| Item Weight | 1.76 ounces |
| Manufacturer | M-D Building Products |
| Material Type | Plastic |
| Model | MD Building - 71506 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Part Number | 71506 |
| Surface Recommendation | surface_recommendation |
| UPC | 043374715064 |
| Unit Count | 1 Count |
| Warranty Description | Warranty |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** M-D Building Products
- **Color:** Gray
- **Item Form:** Foam
- **Item Weight:** 1.76 ounces
- **Surface Recommendation:** surface_recommendation

## Images

![MD Building Foam Backer Rod, Gray, 20ft x 5/8in for Large Gaps - Image 1](https://m.media-amazon.com/images/I/61HHJ4QXlvL.jpg)
![MD Building Foam Backer Rod, Gray, 20ft x 5/8in for Large Gaps - Image 2](https://m.media-amazon.com/images/I/81SA6HZLHaL.jpg)
![MD Building Foam Backer Rod, Gray, 20ft x 5/8in for Large Gaps - Image 3](https://m.media-amazon.com/images/I/818J6gOM3ZL.jpg)
![MD Building Foam Backer Rod, Gray, 20ft x 5/8in for Large Gaps - Image 4](https://m.media-amazon.com/images/I/81Py1S2524L.jpg)
![MD Building Foam Backer Rod, Gray, 20ft x 5/8in for Large Gaps - Image 5](https://m.media-amazon.com/images/I/81-xBTntOuL.jpg)

## Available Options

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

## Questions & Answers

**Q: This will seem like a bizarre question, but does it smell? (Like the majority of Chinese-made closed cell foam materials.)**
A: I use it for taxidermy purposes and havent noticed any smell.

**Q: Is product gray or black?**
A: Mine was Gray...

**Q: Can i use that to repair my garage floor cracks with the concrete caulk?**
A: I wouldn’t. It’s just foam. If the crack is huge I would use sand as a filler and apply a deep layer of concrete patch

**Q: does this break down or come apart easily when wet?**
A: No. Its foam.. it doesnt break down at all

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect for Packing Large Gaps Before Caulking
*by A***S on August 7, 2026*

Really happy with this foam backer rod. It arrived right on time and in perfect condition, no damage at all to the packaging. Works exactly as described and made packing large gaps before caulking so much easier. Great quality material and easy to use. Would definitely buy again for future projects.

### ⭐⭐⭐⭐⭐ Excellent
*by D***E on July 26, 2026*

Excellant

### ⭐⭐⭐⭐⭐ Great quality & sealing ability, highly versatile & easy to use.
*by J***N on March 31, 2026*

High quality & works just as advertised. Seals like a champ. When it comes to sealing air gaps whether it be around window frames, doors, moldings, baseboards, concrete, etc. you get what you pay for. Go for the better quality. It's easy to use, cut, install, highly versatile. This is a great & trusted product.

## Frequently Bought Together

- M-D Building Products - Versatile Gray Foam Backer Rod - Set 5/8in x 20ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71506)
- 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 71480 1/2-Inch by 20-Feet Backer Rod, Gray

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**Shop now:** [https://www.desertcart.kg/products/4320311-md-building-foam-backer-rod-gray-20ft-x-5-8in](https://www.desertcart.kg/products/4320311-md-building-foam-backer-rod-gray-20ft-x-5-8in)

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*Product available on Desertcart Kyrgyzstan*
*Store origin: KG*
*Last updated: 2026-09-01*