First, wane occurs often when lumber is manufactured and cut close to the outside of the timber, resulting in missing material or a bark area. This is done to increase the yield of the timber, which increases lumber manufacturer profits but creates some issues for lumber users. Prime grades...

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...

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,...

Metal plate connected roof and floor trusses are used widely in residential single family, multi- family, commercial, and agricultural construction. They provide design flexibility, span greater distances than traditional “stick framing,” and allow faster erection of the roof system...

This year, you can start your BCMC experience with an exciting panel discussion led by 4Ward Solutions Group that features four of today’s most significant robotics manufacturers: House of Design, Trussmatic, Brave Control Systems, and Randek. The panel discussion will take place Tuesday,...

How does ripping lumber, cutting a board along its length, affect its grade or strength values? Structural lumber is graded or inspected which provides designers, through the National Design Specification® (NDS®) for Wood Construction, the strength/design values for the lumber members....

Sometimes it is necessary to deviate from the truss design drawing and use a different connector. This may happen when a specific size connector is not available or when the original connector has been removed. Per ANSI/TPI 1 Section 3.6.3, a metal connector can be substituted if the new...

With high lumber costs and volatile pricing, it is very reasonable to look for options to normal resources. Many fabricators and lumber manufacturers have been experimenting with using non-regular channels for lumber, including some choices that have created problems and issues with their...

To answer the question of which is the better method, we should start with a little background. A critical plate is a plate with a Joint Stress Index of 80% or greater. The ANSI/TPI 1–2014 Standard stipulates that critical plate inspections must be conducted when completing the three...

Due to the nature of wood, lumber characteristics can vary in every piece. Even “in grade” lumber can have drastic variations in performance. How can we deal with and adjust for natural defects and variability? We have discussed roof trusses in previous articles, including...