---
product_id: 38638724
title: "M-D Building Products - Versatile Gray Foam Backer Rod - Set 1/2in x 250ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71551)"
brand: "m-d building products"
price: "B/.142"
currency: PAB
in_stock: true
url: https://www.desertcart.com.pa/products/38638724-m-d-building-products-versatile-gray-foam-backer-rod-set
store_origin: PA
region: Panama
---

# 0.5in max gap fill Easily trimmed to size Waterproof & weather-resistant M-D Building Products - Versatile Gray Foam Backer Rod - Set 1/2in x 250ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71551)

**Brand:** m-d building products
**Price:** B/.142
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal smarter, live cozier — don’t let gaps steal your comfort!

## Quick Answers

- **What is this?** M-D Building Products - Versatile Gray Foam Backer Rod - Set 1/2in x 250ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71551) by m-d building products
- **How much does it cost?** B/.142 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.pa](https://www.desertcart.com.pa/products/38638724-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

- • **Seal Like a Pro:** Effortlessly fills and seals medium concrete gaps up to 0.5 inches for airtight, draft-free spaces.
- • **Quick & Clean Setup:** Simply push into joints and apply caulk on top—ditch complicated adhesives and enjoy a sleek finish.
- • **Custom Fit, Every Time:** Trim or twist the foam rod to perfectly match your gap size—no mess, no fuss installation.
- • **Multipurpose Home Hero:** Ideal for sealing expansion joints, window sills, doors, and even leaky roofs—boosting insulation and comfort.
- • **Built to Brave the Elements:** Crafted from durable, weather-resistant foam that stands strong against rain, wind, and temperature swings.

## Overview

The M-D Building Products Versatile Gray Foam Backer Rod is a 250-foot, 1/2-inch diameter foam rod designed to fill and seal medium-sized gaps in concrete, doors, windows, and walls. Waterproof and weather-resistant, it provides a durable base for caulking, enhancing insulation and draft protection for both indoor and outdoor applications. Easy to trim and install, it’s the essential caulk saver for professional-grade sealing and long-lasting home comfort.

## Description

Full description not available

## 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 |
|---------------|-------|
| Color | Gray |
| Brand | M-D Building Products |
| Item Weight | 0.01 Ounces |
| Item Form | Foam |
| Maximum Gap Fill | 0.5 Inches |
| Surface Recommendation | Concrete, Door, Walls, Window |
| Tensile Strength | 35 Pounds Per Square Inch |
| Water Resistance Level | Waterproof |
| Number of Items | 1 |
| Manufacturer | M-D Building Products |
| UPC | 043374715514 |
| Global Trade Identification Number | 00043374715514 |
| Unit Count | 1.0 Count |
| Material | Aluminum |
| Part Number | 4962239 |
| Item Weight | 0.01 ounces |
| Product Dimensions | 13 x 10 x 10 inches |
| Item model number | MD Building - 71551 |
| Is Discontinued By Manufacturer | No |
| Size | 250 Ft. |
| Style | 250 Ft |
| Pattern | Solid |
| Shape | Round |
| Item Package Quantity | 1 |
| Number Of Pieces | 1 |
| Measurement System | Inch |
| Mounting Type | Wall |
| Included Components | MD Building - 71551 |
| Batteries Included? | No |
| Batteries Required? | No |

## Product Details

- **Color:** Gray
- **Brand:** M-D Building Products
- **Item Weight:** 0.01 Ounces
- **Item Form:** Foam
- **Maximum Gap Fill:** 0.5 Inches

## Images

![M-D Building Products - Versatile Gray Foam Backer Rod - Set 1/2in x 250ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71551) - Image 1](https://m.media-amazon.com/images/I/61UnawlcwQL.jpg)
![M-D Building Products - Versatile Gray Foam Backer Rod - Set 1/2in x 250ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71551) - Image 2](https://m.media-amazon.com/images/I/81zeuR+Nj2L.jpg)
![M-D Building Products - Versatile Gray Foam Backer Rod - Set 1/2in x 250ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71551) - Image 3](https://m.media-amazon.com/images/I/818J6gOM3ZL.jpg)
![M-D Building Products - Versatile Gray Foam Backer Rod - Set 1/2in x 250ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71551) - Image 4](https://m.media-amazon.com/images/I/81Py1S2524L.jpg)
![M-D Building Products - Versatile Gray Foam Backer Rod - Set 1/2in x 250ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71551) - Image 5](https://m.media-amazon.com/images/I/81-xBTntOuL.jpg)

## Questions & Answers

**Q: Is it safe to use near hot water baseboard radiators? I want to use it behind radiator cover as a temporary fix for a cold draft.**
A: I suspect it would be safe if between the wall and the top cover of the baseboard, assuming you have standard baseboard covers like mine -- which never get super hot. It's foam, and will likely melt if too close to a heat source. To be on the safe side, I'd suggest first contacting the company directly.

**Q: Can you use barge glue and plastidip**
A: Call the manufacturer

**Q: I live in an apartment and i feel a draft coming through the cracks of my window would this help? Im trying to avoid using weather tape**
A: I purchased the medium backer rod and they are 1/2" thick. I think the one I purchased would be too thick to insert into the crack of your windows.  Maybe there is a smaller version that would work for you.

**Q: What caulking do u need for this ?**
A: I did use caulk as it was used to support a garage door seal as the bottom of the door.

## Frequently Bought Together

- M-D Building Products - Versatile Gray Foam Backer Rod - Set 1/2in x 250ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71551)
- 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)
- zzhxkjhky 3/4' Diameter x 80' Length Backer Rod Caulk Saver Foam Backer Rod for Gaps and Joints Backing Concrete Filler

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.com.pa/products/38638724-m-d-building-products-versatile-gray-foam-backer-rod-set](https://www.desertcart.com.pa/products/38638724-m-d-building-products-versatile-gray-foam-backer-rod-set)

---

*Product available on Desertcart Panama*
*Store origin: PA*
*Last updated: 2026-01-22*