Long-Span Wood Trusses—Temporary Bracing and the Requirements to Prevent Catastrophic Collapse under Construction

Over the years, numerous construction collapses have occurred to large wood framed buildings as a result of inadequate temporary bracing of long-span press-plate wood trusses, which have resulted in numerous construction related injuries. In response, provisions were implemented in the building code starting with the 2009 IBC to require specific design for the bracing system as well as special inspection requirements during the erection process. Unfortunately, many designers, owners, and building officials are unfamiliar with these regulations and many engineers provide limiting language in their drawings specifically excluding temporary shoring and bracing from their scope as part of means and methods for the contractor. This paper will discuss the nuances of the code provisions and highlight the void of understanding and responsibility that has resulted in a continued hazard in the construction industry. While the code assigns responsibility for engaging a design professional to the owner, education and enforcement from the building official is critical in safeguarding the industry assuring proper design and construction of the temporary bracing is implemented. In addition, communication between the owner, contractor, Engineer-of-Record, and truss designer needs to include a well-established scope of responsibilities to assure these provisions are met and the building is constructed in a safe manner.