King Post Roof Truss Span

Maximum span douglas fir in horizontal roof rafters and maximum span.

King post roof truss span.

In the south a king post roof truss may be able to span 36 feet with 16 foot spacing where the same truss in a snow belt up north may only be able to span 24 feet with the same spacing. Also known as a fan truss this type of truss is just like a king post except that it has two diagonal braces or web runners emanating from the bottom of the king post to the top chords on either side. It is not suitable for the long span. King post truss is used when the length of span is in the range of 5 to 8 m.

Maximum floor joist span no. It can be used for spans upto 8m. The truss is suitable for spans varying from 5 to 8 metre. Its bottom chord acts as a tie for the room holding the walls from spreading.

The spacing of king post truss is limited to 3 m centre to centre. This truss is also very strong and adaptable with regard to desired span and roof pitch. The king post truss with struts queen posts is based on the popular king post truss design but with the addition of two queen posts pictured above. It can also be built of combination of wood and steel.

This arrangement is particularly good for longer truss spans in excess of 24 feet. A king post truss solves many structural problems as well. Queen post roof truss queen post truss is used when the length of span is in the range of 8 to 12 m. They make a fan type design hence then name fan truss.

The king post truss does not provide storage space because the frames are usually exposed and do allow extra room.