Wood frame construction, window: Framing for wide window in load-bearing wall. The stud frame wall supports the ends of horizontal wood trusses that support the floor above. This load is carried above the window opening with a custom ordered timber header (horizontal beam). The lightweight aluminum sliding window has a gap between its top and the header, so if the header deflects it will not bind the top of the window. The header and its loads are supported by 3-2"x4" studs on both sides of the window.
Otherwise, the wall framing is typical of any wall: two horizontal plates at the top of the wall and one at bottom, 2x4 vertical studs at 16" on centers. Ann Arbor, Michigan 2004