The traditional 'Kingpost' truss. Developed in the late 18th century, this style uses little metalwork and largely depends on joints being in compression.
This governs the available range of profiles to Kingpost, Queenpost, Mono pitched or similarly based forms. A classic design which involves large section timbers with spans which can exceed 14m.
For preliminary drawings the proportions shown can be used - rounded up to stock section sizes as appopiate.
Traditionally the thickness would have been a little under half the tie beam depth. For economy current practice would be nearer one third.
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