Roof Truss Kingpost

Sometimes king post roof trusses are constructed with the tie beam in two thicknesses one notched to each side of the foot of the principal rafters and king post as in fig.

Roof truss kingpost.

In aeroplanes the king post supports the top cables and helps to support the weight of the plane s wings. A king post truss utilizes two top chords a bottom chord and a piece that connects the bottom and top chords vertically called a king post. 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. Trusses are elements where its entire member takes either only compression or tension member are not in bending.

The king post truss is also used for simple roof lines and short span bridges. The truss has four main parts. Simple to make and require a small amount of lumber king post trusses are ideal for small structures. It is often used in simple roof trusses such as in the shed porch and garage.

In a nutshell it s made up of a central vertical post called the king post two rafters meeting at the apex and a tie beam or the horizontal base. The top two diagonal pieces that serve as rafters are known as the upper cords. The oldest surviving roof truss in the world is a king post truss in saint catherine s monastery egypt built between 548 and 565. A king post truss solves many structural problems as well.

King post roof 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. King posts also appear in gothic revival architecture queen anne style architecture and occasionally in modern construction. Roof truss span tables alpine engineered products 15 top chord 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 bottom chord 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2 12 24 24 33 27 27 37 31 31 43 33 33 46 2 5 12 29 29 39 33 33 45 37 38 52 39 40 55 3 12 34 34 46 37 39 53 40 44 60 43 46 64 3 5 12 39 39 53 41 44 61 44 50 65 47 52 70. A king post truss is a simple triangular gable truss with a center brace known as the king truss.

They are only good up to 16 as larger structures require a greater weight distribution. The same thing is true for the bridge of the truss. The bottom horizontal which serves as ceiling and upper floor joist is known as the lower cord. The more complex the truss framework is the greater quantity of these joints will be required.

It is used in aircraft construction. Its bottom chord acts as a tie for the room holding the walls from spreading. Queen post roof truss queen post truss is define as a pitched roof support using two vertical tie posts connected between the tie beam and the rafters. King post trusses are also used as a structural element in wood and metal bridges.