EWI System Holders
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Technical datasheet EWI System Holders Version 2.00 September 2023 EWI System Holders Put simply, ROCKWOOL is made from rock. Our manufacturing process recreates the inside of an active volcano, using a cupola furnace to melt volcanic basalt rock at temperatures of up to 1,500°C. The liquid rock is channelled into a chamber where it is spun into strands. These strands are collected, then mixed with a small amount of binder and water-repelling agent to form stone wool insulation products. Non-combustible thermal insulation Non-combustible • 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 Durable • ROCKWOOL slabs are dimensionally stable and won't shrink or degrade over the lifetime of the building • The dense outer surface provides a solid face for base coat application, and helps to prevent overdriven fixings • Offers a high resistance to wind and rain when exposed during installation • Tried and tested: EWI providers across Europe have been using ROCKWOOL in their systems for over 40 years Breathable • 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 Thermal performance • When tightly butt jointed, the fibres of adjacent slabs will effectively knit together • This eliminates heat losses that would otherwise be caused by gaps between slabs Acoustic performance • EWI systems incorporating ROCKWOOL slabs can add significant mass to the building envelope, helping to limit the transfer of sound and vibration, while the fibrous nature of the product also helps to stop sound through absorption • Test evidence demonstrates an improvement to the weighted sound reduction, Rw, of up to 8 dB (substrate-dependent)

External Wall Dual Density Slab is a stone wool insulation solution specifically developed for use in external wall insulation systems. Made using a ROCKWOOL-patented 'dual density' manufacturing process, the top layer of each slab has a distinctly higher density than the remainder of the product. This provides a robust outer surface for applying render and accepting fixings, while the resilient underside can accommodate unevenness in the substrate. To aid installation the top layer is branded with 'THIS SIDE UP', allowing for quick and easy identification of the outer surface. PERFORMANCE...

External Wall HD Slab is a stone wool insulation solution specifically for use in external wall insulation systems where a higher density slab required. PERFORMANCE Fire Euroclass A1 - non-combustible Thermal Thermal conductivity 0.038 W/mK (30 - 40mm) / 0.039 W/mK (> 40mm) Strength Tensile strength perpendicular to faces > 15 kPa Compressive > 10 kPa For more information visit rockwool.com/uk Pencoed, Bridgend CF35 6NY Tel: (+44) 1656 862 621 • technical.solutions@rockwool.com

EWI System Holders Double Layering Insulation thicknesses greater than 250mm can be achieved by installing slabs in two layers. Where possible both layers should be of the same thickness, e.g. 2 x 150mm to meet 300mm – otherwise, for ease of identification on site, two visually dissimilar thicknesses should be chosen. Fixing instructions Installation is started from the left side of the façade at base track level. When using two different slab thicknesses, the thinner of the two is installed first. To avoid thermal bridging the slabs are installed in a brick bond pattern. First layer The...

LEGAL NOTICES General safety requirements - Building Safety Act 2022 ROCKWOOL Limited is committed to supporting specifiers, resellers and users of ROCKWOOL products for the full life cycle of the product to comply with the obligations and responsibilities set out in the Building Safety Act 2022. With regard to the general safety requirements of the Act, ROCKWOOL Limited cannot control or foresee every situation where its products might be used. We therefore strongly advise that specifiers, resellers and users contact us where use of ROCKWOOL products is contemplated in applications...

ROCKWOOL stone wool -safe to install and live alongside There are no hazardous classifications associated with stone wool insulation manufactured by ROCKWOOL-UK according to EU REACH and UK REACH regulations on health and the environment. ROCKWOOL safe use instruction sheets and material safety data sheets (where applicable) can be downloaded here. Our annual sustainability reports, which set out progress against our sustainability goals, and further details of the positive impacts of using our products can be found on our website. ROCKWOOL products are used to enrich modern living,...