King Post Roof Truss Diagram

The top two diagonal pieces that serve as rafters are known as the upper cords.

King post roof truss diagram.

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. Choose the right truss type. King post truss is used when there is a need to support the weight of an expansive roof. The king post truss does not provide storage space because the frames are usually exposed and do allow extra room.

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. Its bottom chord acts as a tie for the room holding the walls from spreading. The king post roof truss is the simplest of the trusses because of its simple composition. 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.

A 4 12 roof is around 19 degrees. 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. 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. A king post truss is a simple triangular gable truss with a center brace known as the king truss.

It is often used in simple roof trusses such as in the shed porch and garage. The bottom horizontal which serves as ceiling and upper floor joist is known as the. The truss has four main parts. Roof trusses have revolutionized roof framing.

The truss is suitable for spans varying from 5 to 8 metre. King posts also appear in gothic revival architecture queen anne style architecture and occasionally in.