Graphical Construction Glossary >> Roofs and roofing. >> Roof Trusses >> Cruck Truss
A sketch of a full cruck-truss showing a few of the part names. The main point of note is that it reaches almost the full height of the building. There is a huge variety of styles and designs of these structures and it would be impossible to detail them all. The main point being that the available timber in any one place to a large extent determine the design of these early trusses.
At the right is a sketch of a laminated timber portal arch that was popular for church construction work in the early 1960's. At the time the author thought that these were the cutting edge of technology. Not knowing that what he was building was a continuation of a tradition that started centuries before.
If large section timber was available then quite often it would be dressed by adze axe and saw to the required shape and then the whole section was sawn down the middle to make the two equal blades that form the truss.
One category of building that has survived well over the centuries are the larger agricultural building. In particular the Tythe Barns, built to store agricultural produce by rich land holders, churches and monasteries etc.
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"When we build, let us think that we build for ever."John Ruskin 1819-1900
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