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CavityRock is a high-density, semi-rigid stone wool board for exterior cavity walls and rainscreen facades. It pairs with ComfortBatt batts in the stud cavity to add continuous exterior insulation, boosting thermal performance and cutting thermal bridging. Stone wool is non-combustible with a melting point near 2150°F, resists moisture without losing R-value, and absorbs sound. It suits builders and renovators doing rainscreen or ventilated facade work who want fire and moisture performance over foam boards; the trade-off is heavier boards and a higher installed cost than rigid foam.
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Owners and installers of CavityRock boards generally report dense, rigid boards that cut cleanly and hold up in rainscreen assemblies, with strong fire and moisture performance. Complaints center on weight, dust while cutting and the higher cost than foam.
CavityRock MD and CavityRock DD are high-density, semi-rigid stone wool board insulation. They are designed for external cavity wall and rainscreen applications.
Used with ComfortBatt thermal batt insulation in the exterior wall stud cavity, the board provides long-term thermal efficiency, fire resistance, moisture control and acoustic performance.
The stone wool is non-combustible and has a melting point of approximately 1177°C (2150°F). It does not absorb moisture, so it keeps its insulating value. It is chemically inert and does not rot or promote mildew, fungi or bacteria.
