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38 You can expect


tremendous longevity from a well-installed lead roof


when specifying the dimensions of the gutter. To allow for thermal movement the LSA recommends that gutters are divided into bays with the size of each bay depen- dant on the code of lead sheet used. The table shows the maximum length and girth for the five codes of lead sheet that are used for linings of both box and tapered gutters.


RECOMMENDED The LSA recommends the use of a ventilated warm roof for most new roof details as it allows through-ven- tilation above the insulation to disperse any moisture


abuts a vertical wall, where two pitched roofs are joined by a horizontal valley gutter and between adjacent areas of lead roofing. To allow for thermal movement, lead gutter linings must always be divided into separate pieces (bays). As with all lead sheet installations thermal movement must be accounted for


By following these guidelines, you and your clients should have peace of mind and a roof that stands the test of time. All the technical details referred to in this article can be found in ‘Rolled Lead Sheet – The Complete Manual’ which refers to the use of Rolled Lead Sheet BS EN 12588. The LSA has also recently developed an app that brings together some key details that can be easily accessed.


Darren Tutt is technical officer at the Lead Sheet Association


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Get technical advice from the Rolled Lead Sheet experts, at your fingertips


• The LSA's Manual was fully updated in 2016, the biggest revamp in recent years


• Available online as an e-book and as a hard copy • Visit www.leadsheet.co.uk/manuals to order your copy today


Don’t forget the LSA’s technical experts are here to help with all your technical queries, including site surveys and condition reports.


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