85mm Rockwool Hardrock Multi-Fix DD Flat Roof

Rockwool HardRock Multi-Fix (DD) is a premium high-density, non-combustible thermal insulation solution engineered for warm flat roofs. Extensively tested for superior acoustic performance and fire resistance, this product delivers outstanding results.

This 85mm Hardrock Multi-Fix board strengthens lightweight flat roof insulation systems by minimising sound transmission and reducing noise penetration through the building structure.

Perfect for roofs experiencing regular foot traffic and ongoing upkeep requirements, these 85mm Rockwool Hardrock boards work seamlessly with all roof covering types, from torch-on and pour-and-roll systems to single-ply, EPDM, liquid-applied, and green roof installations.

Product specification

• Thickness: 85mm
• Width: 1000mm
• Length: 1200mm
• Pallet Quantity: 15
• Pallet Coverage: 18.00m2
• Density: 160kg/m3
• Weight/m2: 9.6kg
• Weight: 230.4kg
• Thermal Conductivity: 0.039W/mK
• R-Value: 1.54m2K/W
• Fire Rating (Reaction to Fire): A1(Non-combustible)
• Application: Primary base layer for all systems
• Applications: Torch applied, pour and roll bitumen, single ply and EPDM mechanical or adhered systems, liquid applied systems and green roof

This stone wool insulation board features a mineral-coated white fleece facing and integrates effortlessly with a wide range of adhered and mechanically fixed waterproofing systems, including bitumen, single-ply, EPDM, liquid membranes, and green roof applications.

Key features include:

• Produces no smoke hazard and will not support fire growth at any stage, even during fully developed fire conditions.
• Non-combustible per UK building regulations, meeting Zurich School and Academy Design guide requirements and HTM05-03 healthcare guidance standards.
• LPCB approved at the highest level, LPS1181: Part 1 EXT – A rated constructions.
• Outstanding acoustic reduction, absorption, and impact (rain noise) capabilities.
• Satisfies all BB93 (Education) and HTM08-01 (Healthcare) acoustic specifications.
• Acoustic solutions can unlock additional BREEAM credits.
• Maintains dimensional stability throughout its lifespan.
• Delivers reliable thermal performance without blowing agents, featuring zero ODP and GWP.
• Fully recyclable and reprocessable, minimising environmental impact and project costs.

Applications

85mm Rockwool Hardrock Multi-Fix roofing boards perform excellently with these roofing systems:

• Fully bonded, partially bonded, and mechanically fastened single-ply membrane systems, plus EPDM membrane installations.

• 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, when combined with HardRock Multi-Fix (DD), offers enhanced acoustic performance for the highest specifications.

• Rockwool insulation Acoustic Infills are tissue-wrapped, trapezoidal-shaped trough inserts designed to improve the acoustic absorption of perforated metal decks.

More Information on 85mm Rockwool Hardrock DD

• Manufacturer Link: 85mm Rockwool Hardrock Multi-Fix DD
• Browse our complete Rockwool Insulation range and refine by thickness or coverage using the filters on the left. For project-specific advice, suitability assessments, or bulk pricing quotations, contact us on +4402038839057, email sales@insulationbee, or use Live Chat – we offer the best value Rockwool Insulation across the UK.