---
product_id: 179540496
title: "Armacell 1\" Closed Cell Backer Rod/Crack Filler (25 ft)"
brand: "armacell"
price: "€ 36.75"
currency: EUR
in_stock: true
reviews_count: 8
category: "Armacell"
url: https://www.desertcart.hr/products/179540496-armacell-1-closed-cell-backer-rod-crack-filler-25-ft
store_origin: HR
region: Croatia
---

# Waterproof foam for lasting seal 1" diameter for perfect gap fill 25 ft length covers large projects Armacell 1" Closed Cell Backer Rod/Crack Filler (25 ft)

**Brand:** armacell
**Price:** € 36.75
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal smarter, not harder — the pro’s secret to flawless gaps!

## Quick Answers

- **What is this?** Armacell 1" Closed Cell Backer Rod/Crack Filler (25 ft) by armacell
- **How much does it cost?** € 36.75 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/179540496-armacell-1-closed-cell-backer-rod-crack-filler-25-ft)

## Best For

- armacell enthusiasts

## Why This Product

- Trusted armacell brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Easy to Cut & Install:** Flexible material that trims easily with scissors for quick, hassle-free application.
- • **Durable Closed-Cell Foam:** Waterproof and resilient rubber foam that resists compression and keeps seals intact.
- • **Saves Caulk, Saves Money:** Reduces caulk usage by providing a stable backing, preventing costly sealant waste.
- • **Trusted by Pros & DIYers:** Highly rated with 4.7 stars and praised for perfect size and reliable performance.
- • **Perfect Fit for Wide Gaps:** Designed to fill cracks from 3/4" to 1-1/8" wide, ensuring a tight, professional seal.

## Overview

Armacell 1" Closed Cell Backer Rod is a 25-foot waterproof foam rod designed to fill large cracks between 3/4" and 1-1/8" wide. It provides a durable backing that reduces caulk use and prevents sealant from ripping loose, making it ideal for floor joints, garage seals, and expansion joints. Easy to cut and install, this grey rubber foam is highly rated for its perfect fit and long-lasting performance.

## Description

Backer rod is important when sealing large gaps. It allows caulk to span a gap without ripping loose. In the example above backer rod is used where the radon pipe enters the floor before caulk is applied. 1" backer rod is perfect for filling gaps 3/4" to 1-1/8" wide. Sold in 25 foot lengths.

Review: PERFECT SIZE FOR SIDEWALK - This backer rod is part of my sidewalk expansion joint replacement. Pulled the old, rotting wood, filled the crevice with paver sand to 1.5 inches from the top. Tamped it down and leveled with a piece of 1.5 inch wood. Laid this backer rod on top of the sand, which fit tightly and sealed against the cement. The backer rod also reduces the amount of sealant caulk needed. Ideal depth is about 1/2 inch of this self leveling sealant. End result is shown. The local blue and orange stores did not carry the 1 inch backer rod, but this shipped quickly at a very reasonable cost. It is the density needed for this job and cuts easily with ordinary scissors. Don’t settle for the more common 3/4 inch, which may not yield a tight seal essential for SSL caulk. Highly recommended
Review: Worked well for the purpose of weather-sealing a garage door, although installation was difficult - The tubing was used to increase effectiveness of a roll up garage door bottom seal, that had flattened from years of use. This fix was recommended by a professional garage door installer. The original seal tubing had flattened, causing areas of rain leakage. The Backer rod tubing was pushed through the flattened bottom seal to "reinflate" the tubing enough to form an effective water barrier. The material was soft and flexible enough to form a tight seal against the garage door slab. Completely unrelated to the product quality itself, was difficulty encountered when working the tubing through the original seal tube. It must be noted that the use of this product was not for an approved application, so the product was never at fault. This product can be used for the application for which it was purchased, but note that installation difficulty may be encountered. This product is best used for its intended applications.

## Features

- Fill large cracks
- Save caulk
- Keep caulk from ripping loose
- Fill large s

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B081NTJ51G |
| Best Sellers Rank | #41,162 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #151 in Hardware Sealers |
| Brand | Armacell |
| Brand Name | Armacell |
| Color | Grey |
| Customer Reviews | 4.6 out of 5 stars 1,399 Reviews |
| Item Form | Foam |
| Manufacturer | armacell |
| Material Type | Rubber |
| Maximum Gap Fill | 1.13 Inches |
| Number of Items | 1 |
| Part Number | yyhg-905 |
| Surface Recommendation | Floor |
| UPC | 301635340128 |
| Unit Count | 25 Feet |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** Armacell
- **Color:** Grey
- **Item Form:** Foam
- **Maximum Gap Fill:** 1.13 Inches
- **Surface Recommendation:** Floor

## Images

![Armacell 1" Closed Cell Backer Rod/Crack Filler (25 ft) - Image 1](https://m.media-amazon.com/images/I/41wpFNfbCWL.jpg)
![Armacell 1" Closed Cell Backer Rod/Crack Filler (25 ft) - Image 2](https://m.media-amazon.com/images/I/41-MiFwoBcL.jpg)

## Questions & Answers

**Q: Pulled out my rotted 1x4 expansion wood and will have 1-2" void under backer rod when installed.  Any requirement to put something like sand under it?**
A: i think sand would work. Maybe backer rod under backer rod ?

**Q: Can this rod be easily compressed to fit into narrow spaces?**
A: Yes, it is foam and can be compressed by more than half, it can also be trimmed with scissors if needed.

**Q: Can this be used as concrete joint filler?**
A: Yes this works well to fill a gap in concrete, but it should be topped off a good caulk approved for use with cement.

**Q: it is stiff enough to force into the void in the garage door bottom seal?  I just replaced the seal and was looking for something to help keep shape**
A: I actually have some of this 1" backer rod slipped into the seal on my door to fix a section that separated. But it might be kind of difficult to pull into many feet of seal.

## Customer Reviews

### ⭐⭐⭐⭐⭐ PERFECT SIZE FOR SIDEWALK
*by S***6 on June 23, 2024*

This backer rod is part of my sidewalk expansion joint replacement. Pulled the old, rotting wood, filled the crevice with paver sand to 1.5 inches from the top. Tamped it down and leveled with a piece of 1.5 inch wood. Laid this backer rod on top of the sand, which fit tightly and sealed against the cement. The backer rod also reduces the amount of sealant caulk needed. Ideal depth is about 1/2 inch of this self leveling sealant. End result is shown. The local blue and orange stores did not carry the 1 inch backer rod, but this shipped quickly at a very reasonable cost. It is the density needed for this job and cuts easily with ordinary scissors. Don’t settle for the more common 3/4 inch, which may not yield a tight seal essential for SSL caulk. Highly recommended

### ⭐⭐⭐⭐⭐ Worked well for the purpose of weather-sealing a garage door, although installation was difficult
*by B***S on October 16, 2024*

The tubing was used to increase effectiveness of a roll up garage door bottom seal, that had flattened from years of use. This fix was recommended by a professional garage door installer. The original seal tubing had flattened, causing areas of rain leakage. The Backer rod tubing was pushed through the flattened bottom seal to "reinflate" the tubing enough to form an effective water barrier. The material was soft and flexible enough to form a tight seal against the garage door slab. Completely unrelated to the product quality itself, was difficulty encountered when working the tubing through the original seal tube. It must be noted that the use of this product was not for an approved application, so the product was never at fault. This product can be used for the application for which it was purchased, but note that installation difficulty may be encountered. This product is best used for its intended applications.

### ⭐⭐⭐⭐ UPDATE: Actually, it works perfectly.
*by C***S on May 6, 2026*

UPDATE: Actually, it works perfectly, can cut width as needed as well as length. Held at post office because they did not know what to do with it. No shipping updates. The "closed cells" must be filled with helium and just as heavy as that puffy cheese snack that goes crunch. Not thick enough. Yet another gem of a purchase. Next time just bill me but not ship it to save me the from anxiety and despair.

## Frequently Bought Together

- Armacell 1" Closed Cell Backer Rod/Crack Filler (25 ft)
- 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 Croatia*
*Store origin: HR*
*Last updated: 2026-05-25*