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Rockwool® Slab Insulation

Rockwool® Slab Insulation

Molten basaltic rock is spun at extremely high temperatures to create fine interwoven mineral wool fibres, which are then used to make Rockwool® slab insulation. The resulting material is compressed into a lightweight, dense block, which is then joined using a premium glue to produce a product with exceptional thermal and acoustic insulation qualities.

The semi-rigid RWA45 grade of Rockwool® insulation is the one we use most frequently at PAR. In both residential and commercial settings, it is generally used to insulate walls, roofs, HVAC ductwork, floors, and ceilings. Once placed, the material effectively absorbs sound across a wide frequency range and contributes to energy savings by trapping rising warm air. Additionally, it is non-hygroscopic (has little to no inclination to absorb moisture) and needs minimal upkeep.


Used as thermal and acoustic insulation in general building and HVAC applications.

Key Features of Rockwool® Insulation

  • Provides outstanding thermal, acoustic and fire insulation properties.
  • Non-hygroscopic (little or no tendency to absorb moisture).
  • Excellent resistance to high temperatures.
  • Easy to cut and install.


  • Conforms to BS EN 13162:2012 for factory made mineral wool products that are suitable for use as thermal insulation products in buildings.
  • RWA45 has a Euroclass A1 fire protection rating in accordance with BS EN 13501-1 and is considered non-combustible.
  • Rockwool fibres are not classified as a possible human carcinogen as per EU directive 97/69/EC.
  • CE Certificate to EN 13162 for thermal insulation products.

Technical Specification:

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