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1 2 3 4 5 6 7 8 3.21 ROOF TRUSS SYSTEMS - OVERHANGS & CANTILEVERS Truss Heels The end of a truss is also known as the heel of a truss. All trusses have two heels, one at each end. The heel height of a truss is the distance from the top edge of the top chord to the bottom edge of the bottom chord at the heel (see illustration). Minimum Heel Heights for TrusSteel Trusses Due to the internal configuration of heels for non- parallel chord trusses, these trusses have a minimum heel height (see table below). TrusSteel trusses can be fabricated with lower-than- minimum heel heights. Using greater than minimum heel heights can help create more efficient trusses. Minimum Heel Height Table Heel height in inches Roof Chord Size Slope TSC2.75 TSC3.00 TSC4.00 ________________________________ 2 5-9/16 6-1/16 8-1/16 3 5-5/8 6-1/8 8-1/8 4 5-11/16 6-3/16 8-1/4 5 5-3/4 6-1/4 8-3/8 6 5-7/8 6-3/8 8-1/2 7 5-15/16 6-1/2 8-11/16 8 6-1/16 6-5/8 8-13/16 9 6-3/16 6-3/4 9 10 6-3/8 6-7/8 9-1/4 11 6-1/2 7-1/16 9-7/16 12 6-11/16 7-1/4 9-11/16 Overhangs and Cantilevers Most designers who place pitched roofs on buildings design those roofs with perimeter overhangs. Overhangs can be accomplished with trusses by extending the top chords of trusses (overhangs), or by cantilevering the ends of the trusses out past the perimeter bearing support (see illustration). Cantilevered trusses are generally more efficient trusses than those with overhangs, and can simplify the installation of fascia and soffit materials. A cantilevered truss can also have a top chord overhang. Standard Heel Standard Heel with Overhang Standard Heel with Boxed Return Cantilevered Heel Heel height Heel height Cantilever distance Common Heel Conditions ENGINEERED BY ALPINE S P E C I F Y I N G / D E S I G N I N G