Rockwool CavityRock mineral wool boards, 24" x 48" panels, are high-density, semi-rigid insulation designed for external cavity walls and rainscreens. When paired with COMFORTBATT in the wall stud cavity, they deliver long-term thermal efficiency, fire resistance, moisture control, and acoustic performance for resilient buildings. Available in all thicknesses from 1" to 6" to fit your cavity wall needs.

Key Features & Design

• Applications: Designed for external cavity wall and rainscreen applications. This board insulation, combined with the COMFORTBATT thermal batt insulation in the exterior wall stud cavity, offers superior long-term thermal efficiency, fire resistance, moisture control, and acoustic performance.
• Material & Fire Performance: Non-combustible stone wool insulation with a melting point of approximately 1177°C (2150°F).
• Moisture & Durability: Water and moisture resistant; does not absorb moisture to maintain insulating value. Chemically inert; does not rot, promote mildew, fungi, or bacteria.
• Environment & Certification: CFC- and HCFC-free product and process. Made from natural and recycled materials. ROXUL can contribute to earning LEED points.
• Sizes, Coverage & R-Value: Thickness options with Sq Ft per Pallet and R-Value:
  • 1" – 1536 Sq Ft, R4.2
  • 2" – 768 Sq Ft, R8.4
  • 3" – 480 Sq Ft, R12.6
  • 4" – 480 Sq Ft, R16.8
  • 5" – 320 Sq Ft, R21
  • 6" – 356 Sq Ft, R25.2