---
product_id: 75618026
title: "Rockwool RXCB11224, ComfortBoard 80 R-6.3 Rigid Stone Wool Insulation Board, 1.5\" x 24\" x 48\", Covers 48 sq. feet, Fire Resistant"
brand: "rockwool"
price: "¥81656"
currency: JPY
in_stock: true
reviews_count: 6
url: https://www.desertcart.jp/products/75618026-rockwool-rxcb11224-comfortboard-80-r-6-3-rigid-stone-wool
store_origin: JP
region: Japan
---

# Superior acoustic dampening R-6.3 thermal resistance Noncombustible fire barrier Rockwool RXCB11224, ComfortBoard 80 R-6.3 Rigid Stone Wool Insulation Board, 1.5" x 24" x 48", Covers 48 sq. feet, Fire Resistant

**Brand:** rockwool
**Price:** ¥81656
**Availability:** ✅ In Stock

## Summary

> 🛠️ Build smarter, safer, and quieter — insulation that works as hard as you do!

## Quick Answers

- **What is this?** Rockwool RXCB11224, ComfortBoard 80 R-6.3 Rigid Stone Wool Insulation Board, 1.5" x 24" x 48", Covers 48 sq. feet, Fire Resistant by rockwool
- **How much does it cost?** ¥81656 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/75618026-rockwool-rxcb11224-comfortboard-80-r-6-3-rigid-stone-wool)

## Best For

- rockwool enthusiasts

## Why This Product

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

## Key Features

- • **Quiet Comfort Creator:** Exceptional sound absorption reduces noise pollution, perfect for focused, productive spaces.
- • **Fire-Resistant Safety Shield:** Noncombustible stone wool that actively contains and prevents fire spread for peace of mind.
- • **Energy-Smart R-6.3 Insulation:** Stable long-term R-value that slashes energy costs and boosts building envelope performance.
- • **Durable & Dimensionally Stable:** Engineered for compressive strength and compatibility with mechanical cladding systems.
- • **Moisture-Resistant & Mold-Free:** Vapor permeable and inorganic to minimize condensation and eliminate mold risk.

## Overview

Rockwool RXCB11224 ComfortBoard 80 is a 1.5" thick rigid stone wool insulation board covering 48 sq. ft., designed for continuous exterior insulation. It offers a high R-value of 6.3, noncombustible fire resistance, vapor permeability to prevent moisture buildup, and excellent acoustic performance. Ideal for above- and below-grade walls, under slabs, and insulated stucco, it delivers long-term thermal stability and durability compatible with mechanical cladding systems.

## Description

Enhance your building envelope with ROCKWOOL Comfortboard, a rigid stone wool insulation board that provides exceptional fire protection, energy efficiency, and versatility. Available in two product options to support specific structural requirements for your next project, Comfortboard 80 and Comfortboard 110 products are used with screws through strapping and insulation cladding support systems. Comfortboard enables the creation of safer, more comfortable buildings that resist moisture and reduce energy costs. It's engineered for use as exterior continuous insulation in both above- and below-grade exterior walls, under-slab, exterior-insulated stucco assemblies, and in pitched roofs.

Review: Worked well quieting an AC unit. - I have a roof mounted ac condenser. I used this in the attic, on the inner side of the roof, directly under the ac unit. It quieted the hum by about 50%. Which was aabout what I expected. Rockwool makes a sound batt also, but I could not find it near me. I am happy with the results. Easy to cut using only a serrated knife blade.
Review: Pricey - Pricey but works well

## Features

- ComfortBoard 80 R-6.3 Rigid Stone Wool Insulation Board, 1.5" x 24" x 48", covers 48 sq. feet.
- Noncombustible and fire resistant, stone wool works to contain a fire and prevent its spread.
- Vapor permeable enabling wall systems to have superior drying potential, minimizing the risk of condensation and water accumulation. Inorganic, does not promote mold growth
- Stable long-term R-values for superior thermal performance.
- Superior compressive resistance and compatible with screw-through mechanically-supported cladding systems.
- Reduces thermal bridging through wood framing, leading to a higher-performing building envelope.
- Excellent acoustic performance. Stone wool provides excellent noise reduction and sound absorption to help you create quieter, more productive environments.
- Water and moisture repellent
- Dimensional stability to maintain performance
- Applications: Installed in above-grade walls as continuous exterior insulation (ci); Below-grade exterior-insulated foundation walls and basements; Under flat concrete slabs; One-coat and three-coat insulated stucco cladding; Wood-framed cathedral ceilings.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00E5CSSNK |
| Best Sellers Rank | #84,358 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #10 in Construction Boards |
| Color | Tan |
| Coverage | 48 sqft per bag |
| Customer Reviews | 4.6 4.6 out of 5 stars (13) |
| Date First Available | July 25, 2013 |
| Included Components | ComfortBoard Insulated Sheathing |
| Item Package Quantity | 1 |
| Item Weight | 47 pounds |
| Item model number | RXCB11224 |
| Manufacturer | Rockwool |
| Measurement System | inch |
| Part Number | RXCB11224 |
| Product Dimensions | 1.5 x 24 x 0.1 inches |
| UPC | 774783454526 |

## Product Details

- **Brand:** Rockwool
- **Item Thickness:** 1.5 Inches
- **Material:** Wool
- **Product Dimensions:** 1.5"L x 24"W
- **Recommended Uses For Product:** Thermal Insulation, Fire Resistance, Sound Insulation

## Images

![Rockwool RXCB11224, ComfortBoard 80 R-6.3 Rigid Stone Wool Insulation Board, 1.5" x 24" x 48", Covers 48 sq. feet, Fire Resistant - Image 1](https://m.media-amazon.com/images/I/41Ma+o5wJrL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Worked well quieting an AC unit.
*by T***. on November 9, 2025*

I have a roof mounted ac condenser. I used this in the attic, on the inner side of the roof, directly under the ac unit. It quieted the hum by about 50%. Which was aabout what I expected. Rockwool makes a sound batt also, but I could not find it near me. I am happy with the results. Easy to cut using only a serrated knife blade.

### ⭐⭐⭐⭐⭐ Pricey
*by A***G on August 16, 2025*

Pricey but works well

### ⭐⭐⭐⭐ Pricey but works
*by M***S on June 8, 2025*

It's on the pricey side but works well for sound asorbing

## Frequently Bought Together

- Rockwool RXCB11224, ComfortBoard 80, 1.5" x 24" x 48", High-Performance Commercial Insulation
- Refrigeration Technologies RT201B Nylog Gasket/Thread Sealant, 30 ml (1 Pack)
- Shurtape LS 300 HVAC Line Set Tape, 55m Length x 48mm Width, Black (Pack of 1)

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**Shop now:** [https://www.desertcart.jp/products/75618026-rockwool-rxcb11224-comfortboard-80-r-6-3-rigid-stone-wool](https://www.desertcart.jp/products/75618026-rockwool-rxcb11224-comfortboard-80-r-6-3-rigid-stone-wool)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-02*