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When the top or bottom chords of a truss are subjected to large forces, or when load application or hanger requirements necessitate a wider chord member, designers sometimes use stacked chord members, where two chord members are placed one above the other. [For images, See PDF or View in...

In Truss Studio™, the Bearings dialog does more than define where a truss is supported—it directly influences how loads are generated, particularly wind loads on the bottom chord. Adjusting bearing location or type can change how the software interprets exposed versus supported...

As the building and construction industry continues to evolve, we strive to enhance and improve our understanding of the loads and conditions that we need to design for, the engineering tools and methods that we use in our analyses, and the materials with which we build. This advancement in our...

The principle of limiting deflection in proportion to span was first established by Thomas Tredgold, a prominent British engineer born in 1788. He recognized that for a floor to be functional, its bending (deflection) needed to be restricted based on its length. Tredgold originally recommended a...

Real-world performance may not always match tested values. In light-frame construction, structural connectors are often treated as commodity hardware — selected from a catalog, installed in the field, and assumed to perform as designed. In reality, structural connectors are highly...

Per ANSI/TPI 1-2022 (National Design Standard for Metal Plate Connected Wood Truss Construction), Section 6.2.2.5, trusses with an overall span of 18 ft or greater must be evaluated for a 300 lb concentrated person load applied at the midpoint of any chord panel that is not sheathed with...

Purchasing the correct grade of lumber to match your design drawing requirements is only one step in selecting the right lumber. Previously, we’ve discussed lumber quality in “Who is Responsible for Lumber Quality in Your Trusses?,” but let’s expand that discussion with...

Designing long-span trusses starts with a clear definition. Establishing what constitutes a long-span truss sets expectations early, helping to drive smarter design, manufacturing, and logistics decisions from the outset. [For all figures, See PDF or View in Full Issue.] Defining Long-Span...

Mansard-type trusses are a type of roof truss that extend outward and are supported only on top and bottom of the tall end, allowing it to cantilever out without additional support. [For all images, See PDF or View in Full Issue.] They are commonly designed with a pin and vertical roller...

Do you understand deflection and deflection differential — and how your truss systems and, more importantly, your clients’ perceptions will be affected? Deflection has been around for an exceptionally long time and always needs to be considered and addressed. To do so, however, we...