Difference between King Post Truss & Queen Post Truss

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The King post truss & Queen Post truss are type of the sloping roof. Both roofs are used in residential, commercial or industrial buildings.

Also Read: Basic Elements of Roof

Following are the Points which Differentiate both the Trusses:



  • A king post has a central vertical post as used in architectural or bridge designs, working in tension to support a beam below from a truss apex above.
  • Queen Post Truss is defined as a pitched roof support using two vertical tie posts connected between the tie beam and the rafters.
  • The king post truss consists following components:
    • Tie Beam
    • Two Inclined principal rafter
    • Two struts
    • King post
    • Ridge Beam
  • The Queen post Truss consists of following components.
    • Two Queen posts
    • Two Principal Rafters
    • Struts
    • Tie Beam
    • Straining beams
    • Straining sills
    • Purlins
  • King post truss is used when the length of the span is in the range of 5 to 8 m.
  • Queen post truss is used when the length of the span is in the range of 8 to 12 m.
  • One vertical post is provided at the centre of the roof which is called king post.
  • Two vertical posts are provided on 2 sides at a distance which is called queen post.
  • Straining beam and straining sill are not necessary.
  • Straining beam and straining sill are used to keep the queen post in stable position.
  • King-post is connected with principal rafter, strut and tie beam.
  • Queen-post is connected with principal rafter, strut, Straining beam, straining sill and tie beam
  • The top ends of two main rafters are connected to ridge pitch.
  • Top ends of two main rafters are joined with the queen posts heads.
Also Read:

Rafter & its Classification
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