Trussed Roof Load Bearing Wall

They do this by means of top chords which are sloping members that extend from the peak of the roof to the top of the exterior walls at the eaves.

Trussed roof load bearing wall.

If there is a truss over the wall the wall is probably not load bearing since the truss bears the load. If the wall in question is parallel to the joists trusses it will likely not be load bearing. Roof trusses support a roof s weight by transferring the weight load downward and outward to the building s bearing walls. Interior walls might be load bearing or may not be.

Trusses unless a special girder truss which accepts the loads of attached trusses have no interior load bearing walls. That is the beauty of trusses. An example of a non load bearing partition wall can be seen on the left. If one of the truss webs doesn t come down on the wall then it s not load bearing.

With your trusses spanning the exterior walls for the full run of the house no interior walls will be load bearing the splices on trusses are engineered to be self supportive according to the plate sizing the fact that they land over an interior wall has nothing to do with that wall being load bearing trusses are engineered to span exterior wall to exterior wall self supporting. The roof trusses are too long to span the whole house so the load bearing wall runs down the center of the house to support the trusses at the perpendicular intersection in the middle. Engineered roof truss systems may be designed to eliminate the need for load bearing walls or change where the bearing walls are located. If there is a column that supports the truss found in the wall the wall still would not be load bearing because the column is taking the load.

Technically the interior partition walls shouldn t even be touching the truss bottom cord during rough in but they usually are. I ve never seen a 30 truss that needed intermediate bearing but i can t say that it has never happened. When joists trusses are perpendicular to the wall and bear on the top of the wall that wall is bearing wall.