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external envelope
‘The beauty of ‘through the wall’ SFS is that it is possible to meet the U-value required without the need for any additional external insulation, which can sometimes interfere with the supportwork required for the finishes or cause condensation’
The benefits of the system are not simply in terms of thermal
performance – health and safety is improved because it reduces the amount of time operatives have to work outside at height. Once the sheathing boards are attached to the steel frame the building is weathertight and the insulation is fitted from the inside – there is no need to crane up the insulation as there would be in other systems. Using a proprietary ‘through the wall’ SFS also means there is a single source of supply, a full system design and on-site assessment, complete with a system warranty. Any number of different architectural finishes can also be
accommodated. A ventilation channel, fixed on top of the gypsum sheathing board, allows for 25mm and 50mm ventilation cavities to be created for residential applications. From there the finishing possibilities are endless. In the case of render, a carrier exterior cement board is fixed to the ventilation channel as a base for direct render application. Tiles, bricks, glass, timber and metal rain-screening are also easy to achieve, with the cladding material fixed or tied to the facade with suitable fixings secured directly back into the stud. Similarly, leading proprietary ‘through the wall’ SFS can achieve exceptional U-values of 0.15W/m2
K in practice, so meeting the thermal performance proposed for as standard for
new-build in the Building Regulations 2016. And accommo- date wind-loadings of more than 1.0kN/m2
and, for example,
carry the deadload of terracotta rainscreen. Such excellent thermal performance can also be realised
without complicating the installation. When an architect is looking for a very low U-value, this would traditionally be achieved with a standard metal framing and then insulation built up the on the outside of the studs. The beauty of ‘through the wall’ SFS is that it is possible to meet the U-value required without the need for any additional external insulation, which can sometimes interfere with the supportwork required for the finishes or cause condensation. Another big plus is that this also provides a 90-minute
fire resistance that would otherwise mean the installation of dense products such as mineral wool insulation or cement particle board. Ultimately, such an SFS design specification can be chosen
over alternative SIPS and traditional SFS systems because it can meet all performance specifications for structural, thermal, fire and acoustic levels and remain competitively priced. It is lightweight, flexible in design, and can accommodate a number of differing external finishes without compromising its core performance levels.
enq.180
respond online at
www.architectsdatafile.co.uk
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