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Lightning Protection
The installation of a well-designed lightning protection system on a structure will collect the strike itself and dissipate it safely to earth. The design of a lightning protection system for installation in the United Kingdom should be in accordance with BS6651:1991 ‘Code of Practice for Protection of Structures against Lightning'. A harmonised European Standard is anticipated shortly. Since lightning protection works are usually part of the electrical contract package, effective integration of the roofing and electrical design is important at an early stage.
The design process uses a defined formula to establish the need for protection based on building location, design, structural materials and building use. If protection is required, early communication to the lightning protection supplier and/or the roofing contractor of the required roof system components and method of attachment will avoid sequencing difficulties as the job proceeds. Care should be taken to ensure that the detailing of waterproofing, at entry points of the conductor(s) into the roof, is weatherproof and durable and the conductor is, where possible, visible for inspection purposes and not hidden by details or plant installations.
The practice of securing lightning conductor tape with membrane strips is no longer necessary or desirable. Compatible polymeric mouldings, such as the Sarnafil Lightning Conductor Clip (PVC or PP), are available and approved for use with Sarnafil G/S and TG/TS. These are welded to the membrane surface and an integral clamp secures the tape so that the tape is held clear of the roof surface.
Note: The ‘Consultants Handbook’ was available free of charge from W.J. Furse, Wilford Road, Nottingham NG2 1EB at the time of writing.
© 2006 Sarnafil Ltd. Legal Disclaimer
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