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RCI December 2017

FIXINGS & FASTENERS Steel-to-steel: nut-free fixing SFS says it has launched a self-threading screw that enables a secure connection of pre-drilled supporting Complete vapour control delivered with Visqueen’s latest tapes RCIMAG.COM DECEMBER 2017 059 steel structures without any nuts or washers. RCI hears more... The new TDBL nonut self-threading screw from SFS enables a secure connection of pre-drilled supporting steel structures without any nuts or washers. Compared to the standard method of using nuts, bolts and washers, the precisionengineered TDBL nonuts fastener is a quicker, more efficient and secure way of fixing supporting steel structures of various thickness and hardness together subject to static load. The installer only needs one component instead of three and one hand tool. Installation is onehanded and requires access from just one side. Thanks to the innovative design of the TDBL nonut with its thread-free zone and additional serration under the head, the risk of over-driving in thin steel is prevented and the connection remains robust. European-manufactured to a high quality, the plated carbon steel, case hardened TDBL nonut is available in eight variants according to length, diameter and clamping length with a hexagon head. The quality and effectiveness of the TDBL nonut has been well established in Germany, as it is the only solution of its kind with the German national technical approval (“Allgemeine bauaufsichtliche Zulassung”). However, it has been widely used across mainland Europe and the rest of the world in diverse fields of application such as steel beams, stairways, railings, pylons, water tanks, grain silos, fall protection systems, rack constructions and solar parks. A current case study is Panama airport where 28,000 TDBL nonuts are being used in the project’s construction. And nearer to SFS UK’s headquarters in Leeds, 70,000 TDBL nonuts have been used in the 3-storey structural mezzanine system of a large 516,750ft². distribution centre near Ferrybridge. The TDBL nonut has been mainly used in the columns and beam-to-column connections. The product’s unique design has enabled other design changes to be made to the structure of the mezzanine that have complemented structural performance and installation benefits. Andy Stolworthy, director of product and market development, at SFS UK said: “The traditional method of fixing steel structures together by using bolts with nuts and washers represents an unnecessarily awkward and time-consuming way of doing things. We’ve worked to overcome this by developing the TDBL nonut, a technically superior fastener in one piece rather than three. It’s a risk-free alternative that is guaranteed to make steel structure assembly faster, and the customers get the peace of mind of knowing that it’s a product from a global-market leader renowned for quality.” The TDBL nonut, like all products from SFS, is backed with expert technical support that has been at the core of the company’s success in serving the construction and manufacturing industries. www.sfsintec.co.uk Above: The SFS TDBL nonut Visqueen, manufacturer and supplier of structural waterproofing and gas protection systems, has launched a new range of vapour tapes to ensure complete airtightness for building projects when used as an integral part of Visqueen’s Vapour Check system. With a working temperature range from -40°C to 40°C, the Visqueen Vapour Tapes are designed for all weather conditions and are said to actively displace moisture, creating an excellent bond to surfaces. Utilising advanced adhesive technology that is 20 times more aggressive than standard adhesive systems at low temperatures, the Vapour Tapes mount Visqueen’s vapour membranes to the building substructures, providing grip to both wood and metal surfaces whilst ensuring airtight jointing and detailing between membranes. Vapour Tapes form part of Visqueen’s complete vapour barrier system which prevents warm, moist air from permeating into a building’s timber structures and insulation, and improves general airtightness to ensure compliance to Part L of Building Regulations and complies with EN13984:2012. This protects insulation and structural elements from condensation damage and prevents the build-up of damp and mould which can reportedly have negative effects on human health, causing asthma, rhinitis, itchy eyes, respiratory symptoms, respiratory infection and eczema. The tapes are available in two forms. The Visqueen Double Sided Vapour Tape is 20mm x 50m and provides 250 metres of linear coverage, enough for at least one room, and is less than half the price of standard blue butyl tape per linear metre. The Visqueen Single Sided Vapour Tape is a flexible blue PE-Scrim tape and is for sealing overlaps, detailing and pipe penetration. Phil Bull, sales director at Visqueen, commented: “The launch of our Vapour Tapes shows Visqueen’s commitment to providing a complete solution for vapour control within building projects. “By using Visqueen Vapour Tapes together with our Vapour Barrier Membranes, designers, specifiers and contractors can be assured that they are providing complete vapour and airtightness to their building project, in line with the requirements of the latest building regulations.” www.visqueenbuilding.co.uk


RCI December 2017
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