King Post Roof Truss Diagram

King posts were used in timber framed roof construction in roman buildings and in medieval architecture in buildings such as parish churches and tithe barns the oldest surviving roof truss in the world is a king post truss in saint catherine s monastery egypt built between 548 and 565.

King post roof truss diagram.

The truss has four main parts. A king post truss is a simple triangular gable truss with a center brace known as the king truss. A run of 12 12 is a 45 degree angle. King post truss is used when there is a need to support the weight of an expansive roof.

A king post truss solves many structural problems as well. It is often used in simple roof trusses such as in the shed porch and garage. A 4 12 roof is around 19 degrees. 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 king post roof truss is the simplest of the trusses because of its simple composition. Choose the right truss type. It is not suitable for the long span. Its bottom chord acts as a tie for the room holding the walls from spreading.

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. The top two diagonal pieces that serve as rafters are known as the upper cords. The truss is suitable for spans varying from 5 to 8 metre. Roof trusses have revolutionized roof framing.

King posts also appear in gothic revival architecture queen anne style architecture and occasionally in. 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.