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The roof structure is frequently a truss roof supporting purlins or laths, or built using common rafters. Wide buildings with common rafters need interior rows of posts. Sometimes rafters may be attached directly to the poles. The roof pitch of pole buildings is usually low and the roof form is usually gable or lean-to.
The design of most pole barns is simple. Poles make up the outer walls and support the roof system, usually pre-engineered wood trusses with a roof sheathing. Poles are usually spaced 8' apart, with the trusses bearing directly on the poles. Some variations in design call for truss carrying beams between the posts with trusses sitting on them.
Two king post trusses linked to support a roof. Key:1: ridge beam, 2: purlins, 3: common rafters. This is an example of a "double roof" with principal rafters and common rafters. 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.
A single, central post in a roof truss in tension between the rafters and a tie beam (bottom chord), or 2) (U.S.) A short of the tie beam only supporting the rafters via struts. 3) (U.K.) A king post specifically carries a ridge beam otherwise is called a king strut. "King post" was formerly used to describe a crown post in the U. K., but no ...
A truss roof with tongue and groove sheathing. The gap in the sheathing at the ridge is the space designed to allow natural ventilation. Pre-manufactured roof trusses come in a wide variety of styles. They are designed by the manufacturer for each specific building. Timber trusses also are built in a variety of styles using wood or metal joints.
A variation of a plank framed truss with metal plate connectors on a pole barn. Plank framed truss was the name for roof trusses made with planks rather than timber roof trusses. In the 20th century, it was typical for carpenters to make their own trusses by nailing planks together with wood plates at the joints.