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A king post truss has two principal rafters, a tie beam, and a central vertical king post. The simplest of trusses, it is commonly used in conjunction with two angled struts.
The king post is normally under tension, and requires quite sophisticated joints with the tie beam and principal rafters. In a variation known as a king bolt (rod) truss the king post is replaced by a metal bolt (rod), usually of wrought iron.
• Queen post truss
A queen post truss has two principal rafters and two vertical queen posts. The queen post truss extends the span, and combined with spliced joints in the longer members extends the useful span for trusses of these types. As with a king post, the queen posts may be replaced with iron rods and thus called a queen rod truss. This truss is often known as a palladiana (Palladian truss) in Italy, as it was frequently used by the Venetian architect Andrea Palladio. Sometimes a palladian truss is defined as a compound truss with a queen post and king post truss in the same assembly.