Continuous Insulation for Optimal Thermal Performance

ROXUL CAVITYROCK® MD & DD is a non-combustible, water repellent insulation board specifically engineered  for cavity wall and rainscreen applications.  As a continuous insulation (ci), CAVITYROCK® provides excellent thermal performance and minimizes thermal bridging caused by stud assemblies.


This product is specifically designed for use in cavity  wall and rainscreen applications.

Product variations:
CavityRock MD
(mono density) delivers an R-value/inch of 4.2 and is available in thicknesses of up to 2 inches.

CavityRock DD - For assemblies requiring higher R-values, ROXUL's exclusive, dual density CavityRock DD delivers an R-value of 4.3/inch in thicknesses of 2.5 to 5 inches. This unique insulation combines a high density outer layer and a more compliant, low density inner layer that are created simultaneously in our proprietary manufacturing process.


  • Non-combustible stone wool insulation with melting point of approx. 1177°C (2150°F)
  • Fire resistant due to its high melting temperature
  • Water and moisture resistant; does not absorb moisture to maintain insulating value
  • Chemically inert
  • Does not rot, promote mildew, fungi, or bacteria
  • CFC- and HCFC- free product and process
  • Made from Natural and Recycled materials

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