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News Release from: Trussed Rafter Association | Subject: Trussed rafter industry
Edited by the Buildingtalk Editorial
Team on 31 May 2007
Trussed rafter industry braced for rise
in demand
Revisions to the British Standard for the design of trussed rafter roofs looks set to encourage the more widespread use of trussed rafters for non-domestic use.
It is well known that trussed rafters predominate for the construction of domestic roofs and have done so for almost 40 years What is probably not so commonly realised is that around one third of all trussed rafters produced over the past decade or so have been used for constructing the roofs of non-domestic buildings such as supermarkets, hospital extensions, offices, school buildings and many more
This article was originally published on Buildingtalk on 18 May 2006 at 8.00am (UK)
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The development of trussed rafters in these new markets has, in the past, been hampered by the need for special lateral and wind bracing systems for the much longer span roofs.
This, in itself, was not a problem except that the building designer would have the additional cost of designing a one-off bracing system or, in many cases, he would sub-contract this to the trussed rafter designer.
In either case, the extra cost would tend to make the trussed rafter roof less economical.
However, for many situations, this is now a thing of the past.
In the revised British Standard for trussed rafter roof design, BS 5268-3, published late in 2006, an appendix now extends the 'deemed to satisfy' rules for domestic roof bracing to non-domestic roofs up to 17 metres in span.
The Standard's appendix leads designers through a series of look-up tables in order to decide upon the appropriate bracing system and gives detailed solutions to such key details as eaves connections, brace splices and cross-overs.
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