Kingpost Roof Truss

The oldest surviving roof truss in the world is a king post truss in saint catherine s monastery egypt built between 548 and 565.

Kingpost roof truss.

The important point to keep in mind when you use your truss calculator is that every truss calculation is completely unique and is based on the size of your roof and its specific dimensions. 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. A king post truss may be all you need if you re looking to add some extra stability to a garden shed or gable roof. In aeroplanes the king post supports the top cables and helps to support the weight of the plane s wings.

It is used in aircraft construction. Choose the right truss type. Trusses are elements where its entire member takes either only compression or tension member are not in bending. A 4 12 roof is around 19 degrees.

3 build a fink truss to bolster a floor roof or deck. The king post truss is also used for simple roof lines and short span bridges. In a fink truss the internal joists are arranged in a w shape ensuring even weight distribution from one end to the other. King post trusses are also used as a structural element in wood and metal bridges.

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. 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. The truss is a framework consisting of rafters posts and struts which supports your roof. The top two diagonal pieces that serve as rafters are known as the upper cords.

They have one bottom chord two top chords a king post a vertical central member and optional webs that can be straight or curved. A run of 12 12 is a 45 degree angle. We will be going over how to do a king post truss on a shed with a 4 12 roof but it can be done on any type of pitch. A king post truss solves many structural problems as well.

A king post truss is a simple triangular gable truss with a center brace known as the king truss. King posts also appear in gothic revival architecture queen anne style architecture and occasionally in modern construction. Many building codes do not allow a roof on a shed to be less than 3 12 as flatter roofs are more prone to leaks and snow damage. The truss has four main parts.

It is often used in simple roof trusses such as in the shed porch and garage. 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. What are king post trusses. Roof trusses have revolutionized roof framing.