Bottom Chord: A horizontal member that establishes the lower edge of a truss, usually carrying combined tension and bending stresses. Butt Cut: Slight vertical cut on the outside edge of truss bottom chord to make sure uniform nominal span. (Typically 1/4 inch) Cantilever: A condition where both the top and bottom chords extend beyond a support structure with no bearing at the extended end. Chase Opening: An open panel in a floor truss for used for running utilities through it such as air conditioning or heating ducts. Clear Span: The horizontal distance between interior edges of support. Concentrated Load: Superimposed load centered at a given point; (like roof mounted air conditioners). Dead Load: Any permanent load such as the weight of the truss, sheathing, or purlins, roof material, ceiling, etc. Deflection: Movement of an in place truss caused by dead and live loads. Design Loads: The live and dead loads which a truss is designed to support. Fascia: Dimensional lumber used as trim board applied to ends of overhang. Heel: The point on a truss where the top and bottom chords intersect. Heel Height: Height of truss at end of span (excluding overhangs) or plumb cut & butt cut. Interior Bearing Truss: Truss with structural support in the center of a truss span as well as at end points. Lateral Brace: A dimensional lumber member connected at right angles to a chord or web member of a truss, (typically three trusses continuous required). Live Load: Loading which is not permanent, such as snow, wind, temporary construction loads, etc. Overhang: The extension of the top chord of a truss beyond the bearing support. Peak: Point on a truss where the sloped top chords meet. Plumb Cut: Top chord cut to provide for vertical (plumb) installation of fascia. Reaction: The total load transmitted to its support by a truss. Sealed Drawings: Structural Drawings or truss drawings having the seal of a registered professional architect or engineer. Slope: (Pitch) The inches of vertical rise in 12 inches of horizontal run for inclined members Square Cut: End of top chord cut perpendicular to the slope of member. Top Chord: The inclined horizontal member that makes up the upper edge of a truss, usually carrying bearing and compression stresses. Uniform Load: A total load that is equally distributed over a given length, usually expressed in pounds per linear foot (PLF). Valley: A depression in a roof where two roof slopes meet. Webs: Members that join the bottom and top chords forming the triangular patterns that give truss action, usually carrying tension or compression stresses.
Gable • Raised Center Aisle / Monitor • Gambrel • Salt Shed • Mono-Slope
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