I am working on a bathroom renovation. As part of it I am trying to determine if a wall is load bearing. Wall in question runs parallel to floor and ceiling joists. A small window of drywall is removed at floor level. bottom plate of wall is 2x4 and so are studs. In the attic I moved insulation aside and found the top plate...which is a 2x6. Anyway the top plate runs past the wall and ends over the hallway bordering the bathroom. So, is does a top and bottom plate od different sizes make sense?