ROCKWOOL® HARDROCK® Dual Density Roofing Board  


ROCKWOOL® HARDROCK® Dual Density Roofing Boards are high performance fire and acoustic insulation boards for warm flat roofs. ROCKWOOL® HARDROCK® offers the ideal non-combustible dual purpose insulation solution for most types of roof deck, when combined with single ply or high performance built-up roofing systems. The product range consists of 1200mm x 1000mm plain or tissue faced roofing insulation boards in a range of thicknesses. Each board has a robust, high density top surface. Single Ply Adhered (SPA) and cut to falls boards are also available.


  • High strength with excellent point load compressive resistance
  • Faster to install with fewer insulation fasteners
  • Non-combustible
  • Fire resistance up to 2 hours
  • Excellent sound reduction including rain noise
  • Dimensionally stable
  • Cantilever performance
  • Chemically inert – no taping of joints required
  • Suitable for new build and refurbishment
  • Tested and assessed by BRE/LPC
  • Listed as LPCB approved product
  • LPS 1181: Part 1 Grade EXT-A rated constructions
  • Solutions to BREEAM Schools 2006

ROCKWOOL® HARDROCK® Dual Density Roofing Boards are used to achieve high performance thermal, fire and acoustic benefits in warm flat roofs.