Comfortboard®
ROCKWOOL Comfortboard® is a rigid stone wool insulation board engineered for continuous insulation applications. It's designed to be used in above-grade walls, below-grade foundation walls, under concrete slabs and in pitched roof applications.
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Popular applications
- Exterior wall insulation
- Roof insulation
- Below-grade insulation
- Rainscreen insulation
- Basement wall insulation
- Pitched roof insulation
- Exterior-insulated foundation wall
About this product
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-grade and below-grade exterior walls, under-slab applications, stucco assemblies, and pitched roofs.
- Noncombustible and fire resistant
- Water and moisture repellent
- Vapor Permeable to support drying
- Excellent acoustic performance
- Dimensional stability to maintain performance
- Inorganic, does not promote mold growth
Why use stone wool insulation
- 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.
- 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.
- Stone wool provides excellent noise reduction and sound absorption to help you create quieter, more productive environments.
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.
Comfortboard® continuous insulation applications
ROCKWOOL Comfortboard® covers all your needs, above, below and beyond from continuous above-grade insulation to under slab to roofs—for endless versatility.
Minimizing thermal bridging
ROCKWOOL Comfortboard is optimized for insulating above-grade exterior walls, offering comprehensive solutions for residential and commercial construction. As a continuous insulation board, it minimizes thermal bridging, maintaining energy efficiency and comfort.
Comfortboard's acoustic properties reduce noise, enhancing interior comfort, and is moisture resistant and vapor permeable, preventing condensation and mold growth within exterior walls. Noncombustible and fire resistant, Comfortboard supports safe and durable design, making it an essential choice for effective insulation.
Stucco compatible
Comfortboard is a component of both one-and three-coat insulated-stucco assemblies, providing additional solutions to exterior walls.
Below-grade approved
Comfortboard is tested and approved as a continuous layer of insulation in basement walls, on the exterior face of foundation walls and under concrete slabs to improve thermal performance and durability.
Roof
Complete your building envelope with Comfortboard on pitched roofs and in cathedral ceilings.
Product certificates
Declare
ETL Intertek Listed - CA/USA
UL Classified - CA/USA
International Code Council Evaluation Service
Comfortboard® sizes, dimensions & packaging
Find Comfortboard® thickness, width, length and pack quantities—everything you need for accurate specification and ordering.
- All
- 4
- 4.2
- 5
- 5.25
- 6
- 6.3
- 8
- 8.4
- 10
- 10.5
- 12
- 12.6
- 14
- 14.7
- 16
- 16.8
- 20
- 21
- All
- 1
- 1.25
- 1.5
- 2
- 2.5
- 3
- 3.5
- 4
- 5
Specifications & testing
Explore Comfortboard® specifications and test results, based on relevant industry standards.
| Name | Value | Test standard |
|---|---|---|
| Mineral Fiber Block and Board Thermal Insulation | Comfortboard 80 - Type IVB Compliant, Comfortboard 110 - Type IVA Compliant | ASTM C612 |
| Mineral Fiber Thermal Insulation for Buildings | Type 1 Compliant | CAN/ULC S702 |
| Flame spread index | 0 | ASTM E84 |
| Smoke Developed Index | 0 | ASTM E84 |
| Combustibility of Materials at 750 °C | Non-combustible | ASTM E136 |
| Corrosion of Steel | Passed | ASTM C665 |
| Density description | Comfortboard 80: Actual Density 8 lbs/ft³ (128 kg/m³), Comfortboard 110: Actual Density 11 lbs/ft³ (176 kg/m³) | |
| Determination of Fungi Resistance | Passed | ASTM C1338 |
Comfortboard® technical documents & resources
Download Comfortboard® technical documents and resources, including the product data sheet, to support accurate specification and efficient project planning.
Comfortboard 80 continuous insulation - Data sheet
Comfortboard 110 continuous insulation - Data sheet
Comfortboard 80 - Exterior non-structural insulated sheathing board
Continuous insulation in high-performance wall systems and more applications.
ComfortBoard 80 detailed installation guide
Residential product guide Canada - ENFR
Our residential product guide offers advice on insulating to save energy, insulating for a quiet home, maximizing comfort, and importance of vapor barriers.
Residential product guide USA - ENSP
Our residential product guide offers advice on insulating to save energy, insulating for a quiet home, maximizing comfort, and importance of vapor barriers.
Construction Details - Wood Frame Construction Lightweight Horizontal Cladding
Guidelines for cutting stone wool insulation
Board insulation attachment guide
Stucco one-coat fire and acoustic tested solutions
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Roof
Cavityrock®
ROCKWOOL Cavityrock® is a stone wool insulation board designed for exterior cavity wall and rainscreen applications. It is compatible with numerous cladding attachment systems, including z-girts, clip-and-rail systems and masonry ties.
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Product support & insights
From expert technical guidance to real-world case studies and certified sustainability documents, access the tools and insights that support confident, high-performance building with stone wool insulation.
Speak to an expert
Contact our technical team for product, application, and building science support on stone wool insulation.
View our case studies
Discover some of our case studies to learn more about applications of our products in various projects across North America.
Access sustainability documentation
Explore ROCKWOOL’s certified products for transparency and sustainability, including EPDs, HPDs, GREENGUARD, and Declare labels.
