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...

I had a chance not long ago to grab coffee with an old college roommate. We’re both engineers by trade, but our careers took different paths — he went into structural consulting, while I went into component design, working with wood trusses. As often happens, the conversation quickly...

Sometimes, a designed and engineered connection will appear to look like a member to member gap. Because of that, we need to ask the question: should the truss designer always try to eliminate a member to member gap in a truss? Generally speaking, yes, it’s always worthwhile, but there are...

A chase is an intentional opening in a floor truss created by omitting specific diagonal webs to provide space for HVAC ducts, plumbing lines, or electrical runs. For structural efficiency, chases should be located within the middle third of the truss span, where shear forces are lowest....

When given a truss design project, the Truss Designer needs all of the loading parameters before starting work on it. This article will specifically discuss the Thermal Factor (Ct), which is part of the snow load calculations. As with any load parameter, using the wrong value will result in a...

Chapter 3 of ANSI/TPI 1-2022, the National Design Standard for Metal Plate Connected Wood Trusses, provides the component manufacturer with the Quality Criteria they must follow to ensure the metal plate connected wood trusses (MPCWT) they build meet the design assumptions. Section 3.4.2 Lumber...

This article originally appeared in STRUCTURE Magazine and is reprinted with permission. One of the more hotly debated topics in the multi-story wood community is whether wall stud and truss or joist alignment is required over the full height of a building, or whether it is beneficial to...