CPD Specifier May 2015 issue January 2015 | Page 19

Roofing New Klober CPD on BS 5534 Technical brochure accompanies updated presentation With the ever increasing demands of the Building Regs and Standards, technical support for construction materials is in great demand. Changes to BS 5534 ‘Code of Practice for slating and tiling’ will have a major impact on roofing design and installation as well as on specific products such as underlays and dry fixing accessories. Klober will, therefore, shortly be introducing a CPD presentation explaining the full implications. The biggest change relates to single lap tiles, as every tile will now need to be fully fixed with either a clip or nail. This has been prompted by an updated UK wind zone map, the influence of which is also reflected in the wind zone limitation being required on underlay packaging. Cheaper membranes have suffered from ‘ballooning’ causing tiles to lift, in contrast to an air-open underlay such as Permo® air which exceeds the minimum wind uplift resistance and can be used in zones 1-3, and all zones when taped. Klober has been at the forefront of developments in pitched roofing accessories and has built up trust amongst specifiers over many years. Architect Neil Oakley of Danks Badnell Architects put this in perspective saying, “We specified Klober airtightness accessories as they provide a complete package, from underlays and vapour barriers to dry fixing accessories, tapes and sealants for laps and penetrations. They appear to have led the market with these key products, enabling us to achieve the high standard of performance we require”. To address the problem of mortar-related claims under the NHBC Buildmark Warranty, dry fixing using product such as Klober Roll-Fix®, is considered to be best practice. Mortar can still be used, but ridges, hips and verges must now be supported by mechanical means. Specific emphasis is placed on use of correct material ratios in mortar as complaints had highlighted regular instances of poor quality. A six month co-existence period with the old Standard lapses on 28th February. Meanwhile, Klober has been working alongside the NFRC to provide courses free to members explaining how it will impact on them. All have been fully subscribed and will continue until March when the CPD presentation becomes available. The CPD presentation ‘Control of air leakage in roofs’ has also been updated and a new brochure produced to show how airtightness accessories can affect SAP ratings. Ridge Cl