Engineered Roof Trusses Load Bearing Walls

The span in short is the length of the bottom of the truss.

Engineered roof trusses load bearing walls.

I would think that any wall with a truss over it is not likely to be load bearing. Factors that affect truss pricing and cost. Engineered roof truss systems may be designed to eliminate the need for load bearing walls or change where the bearing walls are located. Engineered trusses tend to be designed to span from exterior wall to exterior wall.

For example a gable end truss may be designed with support members that transmit the roof weight load outward to the side walls allowing the end wall directly below it to have breaks or openings in it that would otherwise be impossible. Some spans have a lower rate per foot than others. This is the distance of the bottom chord of the truss from outside overhang of bearing wall to outside of the other bearing wall. Technically the interior partition walls shouldn t even be touching the truss bottom cord during rough in but they usually are.

The first and second floors have 13 5 9 and 9 5 spans add the 6 per bearing wall and each exterior wall you get 33. If all the trusses are identical they can t be load bearing with walls in three different spots. Load bearing interior wall under truss roof. These are structurally engineered not only to bear the weight and stress of a home but also to resist earthquakes heavy winds and other weather related events.

Johnson got it right. That is the beauty of trusses. Stick built roofs tend to only span about the same distance as floor joists and would require load bearing interior walls to support them. We built our own home and it is about 33 wide.

By contrast a non load bearing wall sometimes called a partition wall is responsible only for holding up itself. Load bearing walls support the weight of a floor or roof structure above and are so named because they bear a load. Load bearing walls are fairly self explanatory. Trusses unless a special girder truss which accepts the loads of attached trusses have no interior load bearing walls.

Usually load bearing interior walls support the structure above directly by the components of the wall.