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.
Traditional 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.
A king post truss is a simple triangular gable truss with a center brace known as the king truss.
Anatomy of a traditional king post roof truss.
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.
A 4 12 roof is around 19 degrees.
Its bottom chord acts as a tie for the room holding the walls from spreading.
Therefore the king post truss would have been without doubt the construction used.
What is a king post roof truss.
It is often used in.
The bottom horizontal which serves as ceiling and upper floor joist is known as the.
In aeroplanes the king post supports the top cables and helps to support the weight of the plane s wings.
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 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 posts also appear in gothic revival architecture queen anne style architecture and occasionally in.
A timber roof truss is a structural framework of timbers designed to bridge the space above a room and to provide support for a roof trusses usually occur at regular intervals linked by longitudinal timbers such as purlins the space between each truss is known as a bay.
Queen post roof trusses.
The advantage of the queen post truss is its ability to span greater distances than the king post.
The king post truss is also used for simple roof lines and short span bridges.
Choose the right truss type.
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 top two diagonal pieces that serve as rafters are known as the upper cords.
The king post roof truss is the simplest of the trusses because of its simple composition.
A run of 12 12 is a 45 degree angle.
Rafters have a tendency to flatten under gravity thrusting outwards on the walls.
However with the rooms in the centre section built into the roof structure the most likely type of roof would have been a queen post truss.
The truss has four main parts.
Trusses are elements where its entire member takes either only compression or tension member are not in bending.
The traditional tied king post truss is used for better load bearing than a standard king post truss however it can sometimes also be used in either a straight tied or curve tied variation for aesthetically more appealling results when designed to be exposed.
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.
