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Don’t Forget! You Saw it in the
August 2018 #10229 Page #32
What is the Most Common Fabrication Issue That Impacts a Truss?
T
he most common problem typically encountered is excessive defects in the plated area of the truss. While some defects are acceptable in the plated area, the degree of defects depends on the actual joint situation and forces at the joint.
Connector sizes are controlled by design, handling, and fabrication tolerance. They can also be limited by minimum tooth bite set by the fabricator. For example, some fabricators can decide to increase their minimum tooth count per member in response to issues that may have been encountered as the trusses leave the plant and travel to the jobsite and the structure. Plating to design limits does not include handling and transportation considerations, but fabricators may choose to take these factors into account. The best variable to make adjustments for wane in plated area is the “fabrication tolerance.” It can be adjusted within the software. Adjusting this number higher allows for more defects and will also allow for more mis-placement of connectors. Despite setting a high “fabrication tolerance,” some defects are never acceptable. The following photos show defects impacting a roof truss and a floor truss. Each is not acceptable because defects at the joint are well outside the acceptable limits.
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