HARDROCK® Multi-Fix (DD)  


HARDROCK® Multi-Fix (DD) is a versatile flat roof solution which carries with it exceptional acoustic and fire resistance properties. Suitable for any building type, HARDROCK® Multi-Fix (DD) is compatible with an array of flat roof systems including; Single-Ply, EPDM, green roof, bitumen & liquid membranes.

HARDROCK® Multi-Fix (DD) has excellent acoustic properties and can be used in combination with ROCKWOOL Acoustic Infill’s and ROCKWOOL Acoustic Membrane to provide high performance, acoustic flat roof systems. In addition HARDROCK® Multi-Fix (DD) is tested to the highest European fire classification and has also been tested to meet the highest LPCB standards.


  • Euroclass A1 non-combustible
  • Both LPCB approved (LPS 1181: Part 1 Ext A) & FM approved
  • Excellent acoustic reduction, absorption and impact (rain noise) performance
  • Dimensionally stable providing a long term, consistent thermal performance
  • Can be recycled and reprocessed reducing landfill costs, Zero ODP and GWP

  • Dimensions 1200mm x 1000mm
  • Thickness 50mm - 185mm
  • Thermal conductivity (W/mK) 0.039W/mK
  • Fire resistance Class (EN 13501-1) A1 (BS EN 13501-1)
  • Specific heat capacity 0.84 kJ/kgK
  • Vapour resistance 5.9 MNs/gm
  • Recyclable content 25 - 50% (Depending on definition)
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