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.
Truss roof load bearing 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.
If truss was build as a one piece truss it shouldn t be center bearing.
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.
If there is a truss over the wall the wall is probably not load bearing since the truss bears the load.
Joists are rarely continuous over the top of a wall instead they are often spliced over the top of the wall as dimensional lumber only available in specific lengths.
An example of a load bearing wall call be seen on the right.
Load bearing interior wall under truss roof.
Engineered roof truss systems may be designed to eliminate the need for load bearing walls or change where the bearing walls are located.