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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.

20250407 RW-NA PROD 1672
20240625 RWNA PHO 1523
20231031 RWNA PHO 1441

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  • Declare
  • ETL Intertek Listed - CA/USA
  • UL Classified - CA/USA
  • International Code Council Evaluation Service

Popular applications

  • Exterior wall insulation
  • Roof insulation
  • Below-grade insulation
  • Rainscreen insulation
  • Basement wall insulation
  • Exterior-insulated foundation wall
  • Pitched roof insulation

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- and below-grade exterior walls, under-slab, exterior-insulated stucco assemblies, and in 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.

R-Class Builder Image - Randy Rand
Continuous Exterior Insulation - Comfortboard 80

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.

A Pretty Good House, Waldo Project
Stucco cladding

Stucco compatible

Comfortboard is a component of both one-and three-coat insulated-stucco assemblies, providing additional solutions to exterior walls.

Below grade foundation wall installation
Comfortboard 80
Simcoe, Ontario

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.

R-Class Builder Image - Randy Rand
Pitch Roof insulation - Comfortboard 80

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
  • All
  • Comfortboard 110
  • Comfortboard 80
All
  • 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
  • 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.

NameValueTest standard
Mineral Fiber Block and Board Thermal InsulationComfortboard 80 - Type IVB Compliant, Comfortboard 110 - Type IVA CompliantASTM C612
Mineral Fiber Thermal Insulation for BuildingsType 1 CompliantCAN/ULC S702
Flame spread index0ASTM E84
Smoke Developed Index0ASTM E84
Combustibility of Materials at 750 °CNon-combustibleASTM E136
Corrosion of Steel PassedASTM C665
Density descriptionComfortboard 80: Actual Density 8 lbs/ft³ (128 kg/m³), Comfortboard 110: Actual Density 11 lbs/ft³ (176 kg/m³)
Determination of Fungi ResistancePassedASTM 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 80 continuous insulation - Data sheet

ROCKWOOL Comfortboard® 80 thermal insulated sheathing is a rigid stone wool insulation board designed for use as an exterior continuous insulation.

Comfortboard 110 continuous insulation - Data sheet

Comfortboard 110 continuous insulation - Data sheet

ROCKWOOL Comfortboard® 110 is a rigid, high-density, noncombustible stone wool insulation board designed for use as an exterior continuous insulation in commercial applications.

Comfortboard 80 - Exterior non-structural insulated sheathing board

Comfortboard 80 - Exterior non-structural insulated sheathing board

Continuous insulation in high-performance wall systems and more applications.

ComfortBoard 80 detailed installation guide

ComfortBoard 80 detailed installation guide

This Single Family Residential Builder’s Guide covers the use of ROCKWOOL COMFORTBOARD™ 80 within a split insulation or exterior insulation wall assembly.

Residential product guide Canada - ENFR

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.

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Looking for more on Comfortboard?

Get quick access to additional documents that support your project — from planning to installation. Our Residential Resources Library has everything you need, all in one place.

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