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Comfortbatt®

ROCKWOOL Comfortbatt® is a stone wool batt insulation designed for thermal performance in exterior wall cavities, exposed floors, basements/crawlspaces and attic applications in both wood and steel framing.

20250407 RW-NA PROD 1676
20221101 RWNA PHO 1181

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  • UL Classified - CA/USA
  • UL GREENGUARD Gold Certified
  • USDA BioPreferred Program - 25%

Popular applications

  • Exterior wall insulation
  • Roof insulation
  • Below-grade insulation
  • Basement wall insulation
  • Attic insulation
  • Exposed floor insulation
  • Framed wall cavity insulation

About this product

ROCKWOOL Comfortbatt® is a stone wool thermal batt insulation for exterior wood and steel studs. It's designed for exterior wall cavities, exposed floors, basements/crawlspaces and attic applications.

Comfortbatt features a unique flexible edge that allows for easy installation and helps prevent over compression to maintain its R-value, and is an effective way to improve a home’s energy efficiency.

Comfortbatt is noncombustible and fire resistant, and offers water and moisture resistance.

  • Wide range of available R-values
  • Noncombustible and fire resistant
  • Long term thermal performance
  • Water and moisture resistant
  • Easily cut with a serrated knife
  • Inorganic, does not promote mold growth

Why use stone wool insulation

  • Excellent thermal performance providing a high R-value per inch.
  • Noncombustible and fire resistant, stone wool works to contain a fire and prevent its spread.
  • Stone wool provides excellent noise reduction and sound absorption to help you create quieter, more productive environments.
  • Water resistant, stone wool does not rot or promote the growth of mildew, fungi or mold.
  • Lightweight and easy to install.

Applications

  • Designed for framed exterior wall cavities.
  • Sized for both wood and steel stud construction.
  • Compatible with attic floor or cathedral ceiling applications.
  • Ideal for basement renovations when combined with ROCKWOOL Comfortboard continuous insulation boards.

Common Comfortbatt® applications

Installing insulation

Framed wall cavities

ROCKWOOL Comfortbatt is engineered for installation between wood or steel studs in framed wall cavities, delivering superior thermal performance. Available in various thicknesses, it accommodates cavities ranging from 2x4 to 2x10 stud sizes, ensuring versatility across different construction needs.

Comfortbatt features a unique flexible edge, which simplifies installation and enhances thermal efficiency. This innovative design ensures a snug fit within the cavity, optimizing insulation effectiveness and contributing to energy savings and overall building comfort.

Nick Schiffer custom home builder from NS Builders in Massachusetts

Basement walls

Add Comfortbatt to basement wall assemblies with Comfortboard for an effective split insulation solution.

Attic, insulation, wood, construction, beam, room, home, wall

Attics and ceilings

With available 9.5" thick R38 insulation options, Comfortbatt can be added into attics or cathedral ceilings in a new build or retrofit project, enhancing thermal control and overall home comfort.

Product certificates

  • UL Classified - CA/USA
  • UL GREENGUARD Gold Certified
  • USDA BioPreferred Program - 25%

Comfortbatt® sizes, dimensions & packaging

Find Comfortbatt® thickness, width, length and pack quantities—everything you need for accurate specification and ordering.

All
  • All
  • 13
  • 14
  • 15
  • 21
  • 22
  • 22.5
  • 23
  • 24
  • 28
  • 30
  • 32
  • 38
All
  • All
  • 16
  • 24
All
  • All
  • Canada
  • USA

Specifications & testing

Explore Comfortbatt® specifications and test results, based on relevant industry standards.

NameValueTest standard
Mineral Fiber Thermal Insulation for BuildingsType 1 CompliantCAN/ULC S702
Mineral Fiber Blanket Thermal InsulationType 1 CompliantASTM C665
Flame spread index0ASTM E84
Smoke Developed Index0ASTM E84
Combustibility of Materials at 750 °CNon-combustibleASTM E136
Density descriptionDensity greater than 1.8 lbs/ft³ (28.8 kg/m³)
Determination of Fungi ResistancePassedASTM C1338

Comfortbatt® technical documents & resources

Download Comfortbatt® technical documents and resources, including the product data sheet, to support accurate specification and efficient project planning.

Comfortbatt thermal insulation - Data sheet - USA

Comfortbatt thermal insulation - Data sheet - USA

ROCKWOOL Comfortbatt® is a semi-rigid stone wool batt insulation for exterior wood and steel stud applications in both new construction and renovations.

Comfortbatt thermal insulation - Data sheet - Canada

Comfortbatt thermal insulation - Data sheet - Canada

ROCKWOOL Comfortbatt® is a semi-rigid stone wool batt insulation for exterior wood and steel stud applications in both new construction and renovations.

Comfortbatt residential installation guide

Comfortbatt residential installation guide

ROCKWOOL Comfortbatt® installed in exterior walls is a great way to save energy, but there are other applications that can make a big difference in your home’s comfort.

Comfortbatt r-value expansion - USA fact sheet

Comfortbatt r-value expansion - USA fact sheet

Non-combustible and fire resistant, Comfortbatt will not develop smoke or promote flame spread when exposed to fire

Comfortbatt exterior wall wood stud batt insulation

Comfortbatt exterior wall wood stud batt insulation

Thermal performance, fire safety, and sound control in one product. Learn more about the full ROCKWOOL Comfortbatt product range.

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