115mm Rockwool Hardrock Multi-Fix DD Flat Roof Board

Rockwool HardRock Multi-Fix (DD) delivers high-density, non-combustible thermal insulation engineered for warm flat roofs. Extensively tested for fire resistance and acoustic performance, this board provides superior protection and sound control.

This 115mm insulation board strengthens lightweight flat roof insulation systems by managing sound transmission and reducing noise through the building structure.

Perfect for roofs subject to foot traffic and regular upkeep, the 115mm Rockwool Hardrock boards work seamlessly with all roof covering types—torch-on, pour-and-roll, single-ply, EPDM, liquid-applied, and green roofs.

Product specification

• Thickness: 115mm
• Width: 1000mm
• Length: 1200mm
• Pallet Quantity: 10
• Pallet Coverage: 12.00m2
• 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, making it compatible with numerous adhered and mechanically fixed waterproofing solutions, including bitumen, single-ply, EPDM, liquid membranes, and green roof systems.

Key features include:

• Produces no smoke and will not fuel fire growth at any stage, including during fully developed fires.
• Non-combustible to UK building standards, meeting Zurich School and Academy Design guide and HTM05-03 healthcare guidance requirements.
• LPCB approved at the highest level, LPS1181: Part 1 EXT – A rated constructions.
• Outstanding acoustic reduction, absorption, and impact (rain noise) performance.
• Complies with all BB93 (Education) and HTM08-01 (Healthcare) acoustic standards.
• Acoustic solutions can unlock additional BREEAM credits.
• Remains dimensionally stable throughout its lifespan.
• Delivers consistent thermal performance without blowing agents, featuring zero ODP and GWP.
• Fully recyclable and reprocessable, minimising waste and reducing costs.

Applications

115mm Rockwool Hardrock Multi-Fix roofing boards suit the following roofing systems:

• Fully bonded, partially bonded, and mechanically fastened single-ply membrane systems, plus 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, 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 115mm Rockwool Hardrock DD

• Manufaturer Link: 115mm Rockwool Hardrock Multi-Fix DD
• Browse our full Rockwool Insulation range and refine by thickness or coverage using the left-hand filters. For product suitability advice, quantity discounts, or project-specific quotations, contact us on +4402038839057 , email sales@insulationbee , or use Live Chat - Competitive UK Rockwool Insulation Pricing.