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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Popular applications
- Exterior wall insulation
- Roof insulation
- Rainscreen insulation
- Cavity wall insulation
- Metal roof insulation
About this product
ROCKWOOL Cavityrock® is a stone wool insulation board designed for continuous insulation in exterior cavity wall and rainscreen applications. Cavityrock is a durable, noncombustible solution that is approved for use in many NFPA 285-compliant designs.
Cavityrock offers reliable thermal performance, improved acoustic comfort, and moisture resistance to maintain long term performance. Also available in a black mat finish, Cavityrock Black reducing installation time in open-joint cladding systems.
- Noncombustible and fire resistant
- Component of NFPA 285 assemblies
- Water and moisture repellent
- Made from natural and recycled materials
- Inorganic, does not promote mold growth
- Dimensionally stable to maintain performance
Why use stone wool insulation
- Noncombustible and fire resistant, stone wool works to contain a fire and prevent its spread.
- Water resistant and vapor permeable for effective drainage from an exterior wall assembly.
- Durable inorganic material that does not rot or promote the growth of mildew, fungi or bacteria
- Cavityrock Black is available with a black mat finish for improved open-joint cladding system aesthetics.
Applications
- Designed as exterior continuous insulation for above-grade wall applications.
- Ideal for exterior cavity walls, rainscreens, and open-joint cladding systems.
- Suitable for commercial and industrial buildings.
- Fits seamlessly with pre-engineered cladding attachment systems like clip and rails, continuous girts, and masonry ties.
Product certificates
Declare
Cavityrock® sizes, dimensions & packaging
Find Cavityrock® thickness, width, length and pack quantities—everything you need for accurate specification and ordering.
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Specifications & testing
Explore Cavityrock® specifications and test results, based on relevant industry standards.
| Name | Value | Unit | Test standard |
|---|---|---|---|
| Mineral Fiber Block and Board Thermal Insulation | Type IVB 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 | |
| Determination of Non Combustibility of Building Materials | Non-combustible | CAN/ULC S114 | |
| Corrosion of Steel | Passed | ASTM C665 | |
| Density Description | 6.2 lbs/ft³ (100 kg/m³) outer layer and 3.8 lbs/ft³ (61 kg/m³) inner layer | ||
| R-Value / inch @ 75 °F | 4.2 | hr.ft².F/Btu | ASTM C518 (C177) |
| RSI value / 25.4 mm @ 24 °C | 0.74 | m²K/W | ASTM C518 (C177) |
| Determination of Fungi Resistance | Passed | ASTM C1338 |
Cavityrock® technical documents & resources
Download Cavityrock® technical documents and resources, including the product data sheet, to support accurate specification and efficient project planning.
Cavityrock cavity wall and rainscreen insulation - data sheet
cavityrock® is stone wool insulation for exterior walls, available in various densities and thicknesses.
Cavityrock black features and benefits
Cavityrock Black maintains the same noncombustible properties as unfaced Cavityrock, and as a result can satisfy existing NFPA 285 listings
Cavityrock - Commercial new construction builder’s guide
This ROCKWOOL CAVITYROCK® Guide covers its use in exterior and split insulated walls for steel-framed and concrete buildings.
Additional information about ROCKWOOL cavityrock black
ROCKWOOL Cavityrock® Black is designed, tested, and approved for use in cavity wall and rainscreen systems that require a black finish due to the material being visible behind the cladding
Construction Details - Commercial Steel Frame Construction Heavyweight Cladding
Construction Details - Existing Multi Wythe Masonry Retrofit with Interior Insulation
Construction Details - Industrial Commercial Masonry Construction with Exterior Insulation up to 4 stories
Cladding attachment solutions for exterior insulated commercial walls
This bulletin clarifies and provides guidance regarding different cladding attachment systems through exterior insulation for commercial wall applications.
Bending stone wool insulation for curved designs
Insulating curved surfaces requires careful consideration; improper installation can cause gaps and cracks, compromising performance.
Guidelines for cutting stone wool insulation
Properly cutting stone wool insulation ensures fit and maintains performance, preventing safety and efficacy issues.
Related products
Explore more stone wool insulation solutions for similar applications.
Exterior wall
Frontrock®
ROCKWOOL Frontrock® is a noncombustible stone wool insulation board engineered to be used in mechanically-fastened exterior insulation and finish system (EIFS) designs.
Roof
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.
Exterior wall
Smartrock®
ROCKWOOL Smartrock® is a stone wool insulation board with an integrated smart vapor retarder, or humidity-dependent vapor retarder, for continuous insulation on the interior of concrete and masonry wall assemblies.
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Product support & insights
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