FIXINGS & FASTNERS The new isotak BS-4,8 fastener from SFS Martyn Holloway, business development manager for flat roofing at SFS, explains why a newly improved fastener provides enhanced performance and a more cost-effective solution New isotak ® BS-4,8 fastener • Improved pull-out performance • Faster, easier installation • Better corrosion protection Find out more at www.sfsintec.co.uk or call us on 0113 2085 500 for installers The use of thermally broken fasteners to secure the waterproof membrane and insulation layers has become the norm in most UK newbuild and refurbishment flat roof applications. Ten years ago, SFS launched the isotak fastener range, encouraging the change from all metal to thermally broken polypropylene sleeves and 4,8mm diameter steel fasteners. Now, this sleeve and fastener solution has evolved with a fundamental improvement. SFS has focused specifically on the fastener element of the fixing, which has resulted in the development of the new and significantly improved isotak BS-4,8 self drilling fastener. Being the manufacturer of both the fastener and the appropriate polypropylene sleeves, SFS has been able to improve this product to provide optimum performance. The SFS isotak BS-4,8 provides significantly improved pull-out performance. Compared to its predecessor, the new version offers 40% improvement for steel deck, and 20% improvement for timber deck applications, thanks to the optimised thread geometry. This means fewer fasteners per square metre for many projects, which offers the roofing contractor an even more cost effective installation. With its new, improved drill point BS-4,8 now provides for faster installation, improved reliability and more cost-effective installations. BS-4,8 is ideal for thin decks from 0,63mm through to 1,2mm. The drilling capacity is 2 x 1.25mm and the fastener can self-drill through a single layer of up to 2mm thick steel. The new characteristic values are available from European Technical Approval (ETA) 08/0262. Corrosion protection on the BS-4,8 is also improved with extensive laboratory testing, proving that the surface coating provides enhanced corrosion resistance. The isotak BS-4,8 is fully tested and approved by FM and Sintef, and through ETA 08/0262, the product carries the CE mark. The proven strong and durable SFS isotak R45, R48 and the R75 products remain market leading sleeves, and when combined with the BS-4,8 fastener offers excellent value and performance. Whilst others have focused upon relatively minor adjustments to their polypropylene sleeves, SFS has revised the main fastening element, the screw. This ensures the isotak BS-4,8 fastener “raises the bar” with respect to thermally broken fastener solutions.
RCI March 2018
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