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ROCKWOOL HARDROCK® Multi-Fix Dual Density boards

ROCKWOOL HARDROCK® Multi-Fix Dual Density boards are manufactured from renewable volcanic stone which produces a non-combustible roofing insulation board.

A uniquely versatile solution suitable for all roof covering types - torch, pour and roll, single ply, EPDM, liquid applied and green roofs - new-build and refurbishment.

Standards and approvals

ROCKWOOL HARDROCK® Multi-Fix (DD) roofing boards comply with the requirements of BS EN 13162, ‘Thermal insulation products for buildings, factory made mineral wool (MW) products specification.’


  • The product presents no smoke hazard, and will not contribute to fire growth in any stages of a fire (including the fully developed stage of a fire)

  • The product is deemed to be non-combustible in accordance with UK building regulations complying with Zurich School and Academy Design guide and HTM05-03 guidance for healthcare

  • LPCB approved to highest classification, LPS1181: Part 1 EXT – A rated constructions

  • Excellent acoustic reduction, absorption and impact (rain noise) performance

  • Solutions to meet all BB93 (Education) and HTM08- 01 (Healthcare) acoustic requirements

  • Acoustic solutions provide opportunity for additional BREEAM points

  • Dimensionally stable

  • Consistent thermal performance with no blowing agents. Zero ODP and GWP

  • HARDROCK® Multi-Fix (DD) can be recycled and reprocessed reducing landfill and cost

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