Issue 5 and Volume 144.

LIGHTWEIGHT WOOD TRUSSES: MORE TO CONSIDER Photos by John Hayes. The weaknesses and unacceptability of lightweight wood truss construction and sheet metal surface fasteners, or “gang nailers,” have been given considerable attention over the past two to three years. I agree wholeheartedly that they are a hazard to the health and well-being of firefighters and civilians. In addition to the points already published about trusses, the following are some considerations for those who test these assemblies and those who tout the dependability of truss construction, as well as for firefighters. Keep in mind that although this article addresses wood truss construction, similar consideration, where applicable, should be given to metal truss construction. TEST CONDITIONS VS. REALITY Test loads are static and usually are spread out, distributing the load over more than one support member; on the other hand, a firefighter is in motion and represents a concentrated load imposed on…

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