Cavityrock Black mineral wool insulation board

ROCKWOOL Cavityrock Black is a semi-rigid stone wool insulation board designed for exterior cavity wall and rainscreen applications. Its non-combustible, moisture-resistant construction delivers reliable thermal performance while the black facer helps mask behind open-joint cladding for a cleaner finished look.

Key Features:

• Fire-Resilient Stone Wool: Non-combustible insulation designed to help limit flame spread in exterior wall assemblies.
• Thermal Performance: Provides R-17.2 insulation value for energy-efficient wall and rainscreen builds.
• Black Facer for Open-Joint Cladding: Black mat facer helps visually mask the insulation layer behind open joints.
• Dual-Density Rigidity: Higher-density outer layer improves rigidity for fastening while conforming to the wall surface.
• Moisture & Biological Resistance: Moisture resistant and resists fungi for long-term performance.

Please check the Product Data Sheet Here

Specifications Table:

Frequently Asked Questions (FAQ):

Q: What is this insulation used for?
A: Its designed for exterior cavity wall and rainscreen applications and is compatible with many cladding attachment systems.

Q: Is it faced or unfaced?
A: This product is listed as unfaced, and it is also described as having a black facer/mat finish intended for open-joint cladding aesthetics.

Q: What R-value does it provide?
A: R-17.2.

Q: What are the board dimensions and coverage?
A: Each board is 4 in thick x 16 in wide x 48 in long, with 64 sq ft coverage listed for the item.

Q: Does it resist moisture or biological growth?
A: It is described as moisture resistant and listed as resisting fungi.

A shadow-perfect insulation layer for open-joint faades

Cavityrock Black brings quiet confidence to the wall assemblyperformance-forward stone wool wrapped in a deep, light-absorbing facer that disappears behind open-joint cladding. The effect is crisp and architectural: clean reveals, fewer visual distractions, and a faade that reads intentionally finished. Pair it with modern rainscreen systems and precise panel spacing to emphasize rhythm and shadow play. Its the kind of invisible upgrade that makes a space feel unmistakably more refined and resilient.

Upgrade your exterior wall system with ROCKWOOL Cavityrock Black for fire-resilient, R-17.2 performance and a cleaner open-joint cladding look.

Installation