Difference Between King Post Truss & Queen Post Truss

• 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 define 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 span is in the range of 5 to 8 m.

• Queen post truss is used when the length of 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 in 2 sides at 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.