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Roof trusses

Queen post truss

A queen post truss has two vertical posts instead of one, which lets it span further than a king post truss.

Also known as queen post, queenpost truss, queen post roof truss, two post truss

The two queen posts rise from the bottom chord to the top chords, often with a horizontal member between their heads, leaving an open rectangle in the middle. This extends the span and can leave usable space in the centre of the roof.

The same idea underlies many attic trusses, where the open middle becomes a room.

Related terms
King post trussA king post truss is the simplest roof truss: two top chords, a bottom chord and one vertical post from the apex down to the middle of the tie. Modified queen post trussA modified queen post truss adds diagonal webs to the queen post layout, so it spans further than a plain queen post truss. Attic trussAn attic truss leaves an open rectangular space in the middle of the roof, so the loft can be used as a room. Truss typesRoof trusses come in many shapes, such as fink, mono, attic, scissor and girder trusses, each suited to a different roof form, span or use of the roof space.
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