RainScreen Duo Slab®
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Technical datasheet RainScreen Duo Slab® Version 1.01 September 2023 RainScreen Duo Slab® Non-combustible insulation for ventilated façades RainScreen Duo Slab is a stone wool insulation product specifically developed for use within ventilated cladding systems, as well as sealed systems such as curtain walling. 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. Once installed, the higher density outer surface works in combination with a factoryapplied water repelling agent to give improved resistance to rain ingress during construction. The product can be easily fitted around brackets and other awkward details, and when tightly butted, adjacent slabs effectively ‘knit’ together to provide a continuous insulating layer, reducing heat losses that would otherwise be caused by gaps. Independently tested acoustic benefits Water repellent yet breathable Stone wool is dimensionally stable and has been proven to provide the same performance for more than 55 years after installation.* RainScreen Duo Slab is a BBAapproved insulation product, that in addition to thermal comfort, provides an independently-tested acoustic benefit. Non-combustible insulation for use within façade systems. Can be recycled and reprocessed, reducing landfill costs, with zero ODP and GWP. *FIW, Durability Project Mineral Wool (2016), “Conclusions and Outlook.” Available via EURIMA (European Insulation Manufacturers Association) at https://www.eurima.org/uploads/ModuleXtender/Publications/168/2017-02-21_EURIMA-55YearsOfUse_Info_Sheet_V08_final.pdf For more information visit rockwool.com/uk

APPLICATIONS RainScreen Duo Slab is suitable for use on the following construction types: • Steel frame, timber frame or masonry walls in conjunction with a cladding system; Steel frame or timber frame with a masonry outer leaf For more information visit rockwool.com/uk

RainScreen Duo Slab PERFORMANCE Thermal performance Thermal conductivity = 0.034 W/mK (<90mm) / 0.035 W/mK (≥90mm) Acoustic performance As demonstrated by independent in-situ laboratory testing, RainScreen Duo Slab helps to reduce the transfer of airborne noise - with results for typical systems as high as Rw 62 dB. For more information please see the Rainscreen Acoustic Reference Guide, available on our website. Fire performance Rated Euroclass A1 when assessed to EN 13501-1 using test data from reaction-to-fire tests. Wind resistance RainScreen Duo Slab fixed as indicated in Figure 1 has...

U-values 1. Cladding system in conjunction with concrete/masonry RainScreen Duo Slab between metal bracket system on 200mm reinforced concrete. Notes • Tables based on pointloss scenarios where only the rainscreen brackets bridge the thermal insulation layer. • U-values shown have been calculated with a thermal bridging allowance which has been determined using a 3-dimensional analysis in accordance with BR443. The system modelled included 8mm Rockpanel Rockclad and Plastestrip Thermaframe stainless steel brackets.

2. Cladding system in conjunction with steel frame filled with ROCKWOOL Steel Frame Slab RainScreen Duo Slab on 150mm deep metal studs at 600mm centres with 140mm ROCKWOOL Steel Frame Slab installed within the frame. Notes • U-values shown have been calculated with a thermal bridging allowance which has been determined using a 3-dimensional analysis in accordance with BR443. The systems modelled included 8mm Rockpanel Rockclad and FastFrame rainscreen brackets insulation fixing breather membrane sheating board cladding support bracket cladding panel secondary frame plasterboard lining...

3. Masonry outer in conjunction with steel frame filled with ROCKWOOL Steel Frame Slab RainScreen Duo Slab on 100mm steel frame filled with ROCKWOOL Steel Frame Slab. Notes • U-values shown have been calculated with a thermal bridging allowance which has been determined using a 3-dimensional analysis in accordance with BR443. The systems modelled included 8mm Rockpanel Rockclad and FastFrame rainscreen brackets Pencoed, Bridgend CF35 6NY, secured to the substrate with metal and polypropylene fixings in accordance with RainScreen Duo Slab data sheet. Horizontal joints should be staggered and...

RainScreen Duo Slab has been examined by the BBA and granted Certificate 17/5402 for use in ventilated rainscreen cladding systems on both domestic and non-domestic buildings. RainScreen Duo Slab satisfies the requirements of BS EN 13162 - “Thermal insulation products for buildings. Factory made mineral wool (MW) products". INSTALLATION Work on site RainScreen Duo Slab is supplied in shrink-wrapped polythene packs. Pallets are fitted with a waterproof hood that is suitable for outside storage. The product can be easily cut and shaped using a sharp knife. Fixings A suggested fixing pattern...

RainScreen Duo Slab For use on steel frame, timber frame, or masonry walls in conjunction with cladding Slabs should be close-butted at all vertical and horizontal joints. The horizontal joints of the insulation should be staggered in accordance with good practice. Fixings should have a minimum head diameter of 70 mm. A typical fixing pattern has three fixings per square metre with one metal fixing at the centre of every slab (see Figure 1). The product should be cut and tightly fitted around cladding support elements. For a typical installation, a breathable membrane is placed between the...

RainScreen Duo Slab For use on steel frame, timber frame, or masonry walls in conjunction with cladding • The product should be applied with the printed patterned side (where appropriate) facing outwards. The slabs should be close-butted at all vertical and horizontal joints, and at corners. The horizontal joints of the slabs should be staggered, in accordance with good practice. Slabs should be carefully cut to fit around any protrusions into the cavity. A VCL is placed between the plasterboard and the frame. A breathable membrane is placed between the sheathing board and the product—see...