thermal insulation
thermal insulation
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thermal, acoustic
interior, for flat roofs
Technical characteristics
fire-resistant, high-performance
Thermal conductivity

0.039 W/(m.K)


Tapered thermal and acoustic insulation for flat roofs. Multiple sound sources, especially rainfall, can cause disruption in the interior environment. This is where the HARDROCK Multi-fix (DD) Tapered range comes in. Compatible with an array of roofing systems and offering exceptional acoustic and fire resistance properties, this product also provides a water management solution by coming pre-cut to provide a fall in the roof level. ROCKWOOL HARDROCK Multi-Fix (DD) is manufactured from renewable volcanic stone which produces a non-combustible roofing insulation board. The boards are compatible with a range of flat roof systems, including single-ply, EPDM and liquid membranes, bitumen, and green roofs. HARDROCK Multi-Fix (DD) boasts an extremely high acoustic performance, offering a robust fire-resistant acoustic solution for flat roofs. Tested and assessed under the stringent European reaction-to-fire classification system, HARDROCK® Multi-Fix (DD) achieves the highest Euroclass A1 rating, as well as meeting the highest LPCB standards. In specifying insulation, it is crucial to consider characteristics such as combustibility and smoke toxicity. HARDROCK® Multi-Fix (DD) provides an acoustically sound, non-combustible and non-toxic solution to flat roof insulation. Accreditations: Euroclass A1 non-combustible, LPCB & FM approved. Achieves Euroclass A1 (non-combustible) LPCB (LPS 1181: Part 1 Ext A) and FM approved Excellent acoustic reduction, absorption and impact performance – whether from people, machinery or rain on the roof. HARDROCK® Multi-Fix (DD) is dimensionally stable and will provide long term consistent thermal performance over its lifetime.


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