HardRock® Multi-Fix (DD)
HardRock Multi-Fix (DD) is a BBA-approved dual-density insulation board suitable for various surfaces, including flat roofs. In addition to thermal comfort, it provides independently tested acoustic and fire resistance properties.
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Application(s)
- Roof
- Flat Roof
- Cold Pitched Roof / Loft
Product description
ROCKWOOL HardRock Multi-Fix (DD) is a high density, non-combustible thermal insulation board for flat roofs which has also been tested for acoustic applications and fire resistance.
HardRock Multi-Fix (DD) has been proven to improve the ability of lightweight flat roof systems to control both noise ingress and egress through the building envelope.
Suitable for areas subject to pedestrian traffic and frequent maintenance, the boards are compatible with all roof covering types, including torch-on, pour-and-roll, single-ply, EPDM, liquid applied and green roofs.
- Euroclass A2-s1,d0 in accordance with BS EN 13501-1 Reaction to Fire rating
- Thermal conductivity 0.039 W/mK
- BBA approved (Certificate No. 21/5878)
- Tested in accordance with ISO 140-18 for rain noise
Areas of application
Application for HardRock Multi-Fix (DD) roofing boards are:
- Fully bonded, partially bonded, mechanically fastened single ply membrane systems and EPDM membrane systems
Documentation
Hardrock Multi Fix DD Datasheet
HardRock Multi-Fix (DD) is a BBA-approved dual-density insulation board suitable for various surfaces, including flat roofs. In addition to thermal comfort, it provides independently tested acoustic and fire resistance properties.
RockFall Datasheet
Non-combustible insulation for warm pitched-roofs. RockFall datasheet.
Hardrock Multi Fix DD BBA Certificate
Certificate No. BBA-21-5878
HardRock Multi-Fix (DD) Installation Guide
Installation guideline for ROCKWOOL HardRock Multi-Fix (DD)
SUIS ROCKWOOL UK
Safe use instruction sheet ROCKWOOL stone wool insulation products
Republic of Ireland Price List
Price List March 2025
UK Price List
Price List March 2025
Product properties
| Name | Value | Test standard | Symbol | Unit |
|---|---|---|---|---|
| Declared thermal conductivity | 0.039 | EN 826 | λD | W/mK |
| Reaction to Fire | A2-s1,d0 | EN 13501-1 | Euroclass | |
| Long term water absorption | WL(P) | EN 12087 | WL(P) | kg/m² |
| Short term water absorption | WS | EN 1609 | WS | kg/m² |
| Product standard | EN 13162:2012+A1:2015 | |||
| Facing type, side 1 | Mineral Fleece | |||
| Declaration of Performance (DoP) number | RWUK-CE-0144-08_english | |||
| BBA certificate number | 21/5878 |
Product variants
Industrial development achieves thermally efficient green roof with ROCKWOOL®
Discover how ROCKWOOL helped Southern Water create a 17,800m² green roof using sustainable insulation. It enhances biodiversity, manages rainwater, and blends seamlessly into the landscape.
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