Origin & Properties of Stone Wool

Stone wool (or mineral wool) was discovered on the islands of Hawaii at the beginning of the century. It occurs there naturally as a byproduct of volcanic activity. In its manufactured state, stone wool combines the power of rock with the characteristics of typical insulation wool. And, thanks to its non-directional fiber orientation, it also exhibits some unique and valuable characteristics.



  • Unique non-directional structure of ROXUL stone wool insulation content is denser than traditional insulations
  • Effectively reduces airflow and sound transmissions
  • Higher air flow resistivity means better sound attenuation

Sound Absorption

  • Non-directional fiber of ROXUL stone wool helps absorb acoustic waves and can reduce the intensity and propagation of noise

Fire Resistant

  • ROXUL stone wool can withstand temperatures up to 2150º F (1177º C);consequently it does not contribute either to the development and spread of fire or the release of toxic gases

Water Repellent

  • Water repellent yet vapour permeable
  • R-value unaffected by moisture
  • Completely resistant to rot, mildew, mould and bacterial growth- contributing to a safer indoor environment

Dimensional stability

  • Retains its characteristics over time
  • Minimal changes in size and performance are evident with changes in temperature and humidity