Horizontal Shearing Of A Roof Trust

A sagging roof line may original from the ceiling s horizontal rafters.

Horizontal shearing of a roof trust.

This article focuses on typical single storey industrial buildings where trusses are widely used to serve two main functions. It is often used in simple roof trusses such as in the shed porch and garage. Rafters have a tendency to flatten under gravity thrusting outwards on the walls. The rise will be the elevation change over the 12 inches.

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. The king post roof truss is the simplest of the trusses because of its simple composition. When the framing of the roof is put together quite frequently two of the ceiling rafters will be fixed together as this will create a much longer span. To carry the roof load.

Typically they are lapped and then toe nailed together in its center so that the correct length can be achieved. Pitch slope the pitch or slope is the incline of the roof expressed as a fraction describing the rise over the run. For example a slope of 6 12 means for every 12 inches of horizontal distance the slope of the roof will rise 6 inches vertically. Trusses are also used to carry heavy loads and are sometimes used as transfer structures.

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.