In the truss industry, camber refers to the gradual curvature of a chord member either naturally occurring or created to alleviate the natural deflection of a truss structure. That sounds simple enough, but there are key elements about camber that should be considered. Camber in Action All...

Component manufacturers have long been in search of “any practical technology that can lessen rejects”[1] when fabricating trusses from our imperfect supply of lumber. New machines and processes have increased material throughput, but they have also increased the time lost when...

Fire retardant lumber, also called FRTW, is used when a project has a requirement to reduce the structures’ ability to burn and to reduce the structures’ contribution to the spread of fire. Most fire retardant materials also reduce the development of smoke and the release of...

It never ceases to amaze me how “simple” things can become so complicated. I’m sure I’m not alone in this quandary – the feeling that you’ve stepped into a maze and now struggle to get out. Simple Beginnings, Complicated Developments Last spring, I...

How does a component manufacturer determine what fabrication tolerances should be used during truss design? To answer that question, we first need to clarify what is meant by “fabrication tolerance.” Per ANSI/TPI 1–2014, the guidance is 3.3.2 Fabrication Tolerance. All...

Over the last couple of articles, I’ve spent some time discussing improvements that would improve both the energy efficiency and the ability of the truss system to withstand extreme weather conditions. If you’ve read those articles, you will know that I think it is ridiculous that we...

Each generation has to learn all the life lessons either through their own mistakes or the counseling of the older generation. The vast majority of us wish not to repeat the same mistakes and, if possible, avoid them altogether. If you wish to avoid embarrassment, whether you are new to being an...

The photo shows a 2 x 4 truss with an ANSI/TPI 1 non-compliance issue. This is something that never should have happened! Can you spot the problem? [For photo, See PDF or View in Full Issue.] If you shouted, “a missing connector,” then give yourself a gold star! As I was ranking...

Everyone who uses lumber in trusses understands that defects in lumber can impact truss performance in different ways. Some defects are not important but others will affect truss performance and can even cause truss failure. [For all photos, See PDF or View in Full Issue.] In the first photo,...

Originally intended as an improvement in lumber manufacturing, most dimensional lumber used for framing has a radius corner created during the planing process. The rounded corner radius is intended to make the lumber easier to handle and can improve the lumber’s performance because sharp...