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Dual Density Technology

Producing resilient and robust slabs for external applications

ROCKWOOL has pioneered innovative Dual Density technology through a specialist manufacturing process. Comprised of a high-density outer layer and a lower-density sub-layer, Dual Density products provide compressive resistance, sound absorbency and many other benefits for different applications. Dual Density stone wool products in the United Kingdom are supplied exclusively by ROCKWOOL and its distribution network. 

Manufactured using Dual Density technology, the outer surface of each slab features a distinctly higher density than the underside. This provides a firm and robust surface for the application of fixings, while the resilient underside can accommodate unevenness in the substrate.

RainScreen Duo Slab

ROCKWOOL Rainscreen Duo Slab® is a non-combustible thermal insulation for ventilated rainscreen and overcladding applications. The Dual Density slab has a resilient surface for accepting mushroom-head fixings, whilst the underside absorbs any imperfections or unevenness in the substrate. The robust outer surface and inner face are also an effective protection against adverse weather conditions. 

The fibres of adjacent slabs knit together when tightly butt jointed, eliminating any gaps through which heat can be lost. 

Alongside the sound absorption properties offered by ROCKWOOL stone wool, the change in density between the two layers provides an additional benefit in that it causes soundwaves to be reflected at the interface, further enhancing the acoustic performance.

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Crowne Plaza Hotel - Heathrow Airport Terminal 4 - RAINSCREEN DUO SLAB

HardRock Multi-Fix (DD)

Compatible with a range of flat roof systems, ROCKWOOL HardRock Multi-Fix DD provides acoustic and fire resistance properties. The Dual Density  composition gives a high-density top surface which exhibits compressive resistance, engineered to last for at least 65 years. 

Despite its robust nature, the board is easy to cut, shape and install. As only one fixing is typically required per board for mechanically fixed roof systems, HardRock Multi-Fix DD reduces installation time and costs. 

ROCKWOOL Dual Density technology in the HardRock Multi-Fix DD roofing system means the boards provide both mass and absorption for acoustic performance, which can eliminate the requirement for additional mass layers allowing performance criteria to be met through the insulation alone. 

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Queen Elizabeth Stadium

Thermal RockFloor®

The unique dual density structure of Thermal RockFloor® means the slabs can absorb sub-floor imperfections on one side, and provide a high level of compressive strength on the other. The slabs are also easy to handle and fit.

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Home, floor, carpet, living room, couch

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