On Edge - Vertical placement of a member's wide edge.
On The Flat - Horizontal placement of a member's wide edge.
Out-To-Out Span - See Overall Span
Outrigger - Wood member nailed to a truss to form a rake overhang beyond the wall line.
Overall Rise - Vertical distance from bottommost part of the bottom chord to uppermost point on peak.
Overall Span - Outside-of-frame dimensions, not outside-of-sheathing dimensions.
Overall Truss Depth - Vertical distance between bearing and the uppermost point of the peak.
Overall Truss Length - The horizontal length of truss including the cantilever, but not the overhang.
Overhang - The extension of a top or bottom chord of a truss beyond a support.
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