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Graphical Construction Glossary >> Roofs and roofing. >> Roof Trusses >> bowstring truss
Also known as a Belfast Truss
In the photo above we are looking at quite flat bowstrings that have a curved top chord. These trusses are spanning about 18M. They are made up on site from prefabricated kits using lightweight MS angles flat and plate connectors. Bolted together to form the trusses. Top chords can also be segmented straight sections as seen in the lower sketch. Bottom chords are usually slightly cambered. The author has experience working with a timber engineering company that made trusses up to 100ft. span using laminated softwood. The bottom chords had a camber of around 1" every 10ft. At that time, (in the early 1960's) prior to the advent of cheap steel systems, these timber bowstrings were the most economical way of clear span roofing sheds and warehouses. If you didn't find exactly what you are looking for try this search tool that will search the site and the web. "What can be added to the happiness of a man who is in health, out of debt, and has a clear conscience? "When we build, let us think that we build for ever."John Ruskin 1819-1900 |
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Please Note! The information on this site is offered as a guide only! When we are talking about areas where building regulations or safety regulations could exist,the information here could be wrong for your area. It could be out of date! Regulations breed faster than rabbits! You must check your own local conditions. Copyright © Bill Bradley 2007-2012. All rights reserved. 
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