Thermal-acoustic insulation EWI

stone woolpanelwall

External Wall DD (Dual Density) Slab for external walls is manufactured using Dual Density technology. The outer surface of each slab features a higher density than the underside providing a firm surface for the application of fixings, while the underside can accommodate unevenness in the substrate. Pre-installation trials are recommended to determine that the level of unevenness in the substrate can be covered without gaps forming between slabs. Once installed and tightly joined together, the edges knit together, providing a continuous insulating layer of trapped pockets of air with no gaps and no associated loss of thermal performance. ROCKWOOL stone wool achieves the highest ‘A1 – Non-combustible’ rating under the European Reaction to Fire Classification system. This means that it doesn’t burn and won’t contribute to any stage of a fire. • The dense outer surface provides a solid face for base coat application, and helps to prevent overdriven fixings. • The breathable open-cell structure of ROCKWOOL stone wool allows water vapour to pass through, while the randomly oriented water-repellent fibres work to prevent water ingress. • ROCKWOOL stone wool has a vapour resistance similar to that of still air. • When tightly butted, adjacent slabs effectively ‘knit’ together to provide a continuous insulating layer, reducing heat losses that would otherwise be caused by gaps. • Test evidence demonstrates an improvement to the weighted sound reduction, Rw, of up to 8 dB (substrate-dependent).