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The Origins and 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 is denser than traditional insulation products
  • Non-directional fibres help to absorb acoustic waves and can reduce the intensity and propagation of noise
  • Effectively reduces airflow and sound transmission
  • Higher air flow resistivity means better sound attenuation

Fire Resistant

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

Water Repellent

  • ROXUL stone wool is water repellent yet vapour permeable
  • The long-term R-value of stone wool is unaffected by moisture over time, due to the inherent drying potential of the product
  • 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

Discover more about stone wool's unique qualities.