Horizontal Shearing Of A Roof Trust

Pitch slope the pitch or slope is the incline of the roof expressed as a fraction describing the rise over the run.

Horizontal shearing of a roof trust.

The rise will be the elevation change over the 12 inches. 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. Rafters have a tendency to flatten under gravity thrusting outwards on the walls. Typically they are lapped and then toe nailed together in its center so that the correct length can be achieved.

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. The run or the base number is 12 inches. Properly designed drag strut trusses shear walls or roof diaphragms and their connections will transfer lateral loads to the foundation and then safely into the ground. It is often used in simple roof trusses such as in the shed porch and garage.

The king post roof truss is the simplest of the trusses because of its simple composition. 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. To carry the roof load. Trusses are also used to carry heavy loads and are sometimes used as transfer structures.

To provide horizontal stability.