HARDROCK® MULTI-FIX (DD)
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Technical datasheet HARDROCK® MULTI-FIX (DD) Version 2.00 February 2023 HARDROCK® MULTI-FIX (DD) Non-combustible insulation for flat roofs ROCKWOOL HARDROCK® Multi-Fix (DD) is a stone wool insulation board faced with a mineral-coated white fleece, compatible with a wide range of adhered and mechanically fixed waterproofing systems - including bitumen, single-ply, EPDM and liquid membranes, as well as green roof systems. • 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 For more information visit rockwool.com/uk HARDROCK® Multi-Fix (DD) is a BBA approved insulation board that, in addition to thermal comfort, provides independently-tested acoustic and fire resistance properties. ROCKWOOL stone wool insulation, like the basalt rock it is made from, is non-combustible by nature with no chemical flame retardants. It is capable of withstanding temperatures exceeding 1,000°C.

APPLICATIONS HARDROCK® Multi-Fix (DD) roofing boards are compatible for use with the following roofing systems: • Fully bonded, partially bonded, mechanically fastened single ply membrane systems and EPDM membrane systems • Torch applied, bitumen based and mastic asphalt built up systems • Liquid applied systems • Green roof systems ROCKWOOL Acoustic Membrane is a high density polymer mass layer that combines with HARDROCK® Multi-Fix (DD) to offer enhanced acoustic performance for the very highest specifications. ROCKWOOL Acoustic Infills are tissue wrapped trapezoidal shaped trough...

The HARDROCK® Multi-Fix (DD) roofing board range HARDROCK® Multi-Fix (DD) Underlay Application Primary base layer for all systems Board size Standard thickness HARDROCK® Multi-Fix (DD) fleece faced Application Torch applied, pour and roll bitumen, single ply and EPDM mechanical or adhered systems, liquid applied systems and green roof Board size Standard thickness HARDROCK® Multi-Fix (DD) tapered roof system Application Board size Standard thickness Individually designed to meet scheme requirements ROCKWOOL Multi-Fix acoustic flat roof system ancillaries HARDROCK® Multi-Fix (DD) Underlay...

HARDROCK® MULTI-FIX (DD) PERFORMANCE Thermal performance The thermal conductivity of HARDROCK® Multi-Fix roofing boards is 0.039 W/mK (λ 90:90). Resistance to moisture ROCKWOOL products consist of randomly orientated water repellent fibres that prevent moisture from working its way into the board. Should any boards become wet during installation they should be allowed to dry out naturally, prior to applying the roof membrane. Dimensional stability HARDROCK® Multi-Fix (DD) roofing boards are dimensionally stable when tested to EN 1604 and therefore do not exert any undesirable stress on the...

HARDROCK® MULTI-FIX (DD) Product Fire resistance integrity (mins) Fire resistance insulation (mins) Underlay - for mechanically fastened single ply external membranes Fleece faced Multi-Fix - for fully adhered single ply external membranes Acoustic performance ROCKWOOL has a unique in-house design capability to provide bespoke project specific rain noise calculations and can support with a comprehensive suite of absorption and sound attenuation test data. The service will support cost effective project design and help meet the Education acoustic requirements, BB93. Sound absorption...

HARDROCK® MULTI-FIX (DD) SINGLE PLY / EPDM ROOFING - SYSTEMS Example 1 - Single layer system (Partial/fully bonded or mechanically fixed) System performance information Single ply/EPDM membrane Acoustic performance: 150mm Rw 41 dB airborne, LIA 51.9 dB rain noise Example room types & usage Primary/Secondary school classrooms (BB93) Vapour control layer Acoustic performance: 185mm Rw 43 dB airborne, LIA 50.2 dB rain noise Standard metal deck Example room types & usage Music Room (BB93) Thermal performance 0.25 W/m2K (150mm), 0.20 W/m2K (185mm) Example 2 - Dual layer system (Partial/fully...

HARDROCK® MULTI-FIX (DD) SINGLE PLY / EPDM ROOFING - SYSTEMS Example 3 - Dual layer, perforated deck system (Partial/fully bonded or mechanically fixed) Single ply/EPDM membrane System performance information Acoustic performance Rw 41 dB airborne, LIA 49.0 dB rain noise Class C sound absorption 150mm HARDROCK® Multi-Fix (DD) Underlay Vapour control layer Example room types & usage Sports Halls (BB93) Thermal performance 0.18 w/m2k Acoustic infill Perforated D 60 Metal deck Example 4 - Single ply green roof (Partial/fully bonded or mechanically fixed) System performance information...

HARDROCK® MULTI-FIX (DD) SINGLE PLY / EPDM ROOFING - FIXING OPTIONS Mechanically fastened single ply/EPDM membrane systems HARDROCK® Multi-Fix (DD) roofing boards are suitable for mechanically fastened single ply/EPDM systems. HARDROCK® Multi-Fix (DD) board fixing methods Where the complete roofing board system is mechanically fastened, it is recommended that a minimum of one mechanical fastener is used centrally per board to secure the boards during installation. The HARDROCK® Multi-Fix roofing boards are to be laid staggered, tightly butt-jointed and mechanically fastened through the...