The National Institute for Occupational Safety and Health estimates that what percentage of roof systems in the US are built using a truss system?

The National Institute for Occupational Safety and Health estimates that approximately 60 percent of roof systems in the U.S. are constructed using truss systems. This high percentage reflects the widespread adoption of truss designs due to their efficiency and strength-to-weight ratio, allowing builders to create larger spaces without the need for traditional framing methods. Truss systems often reduce material costs and installation time, making them a preferred choice in residential and commercial construction. This prevalent use of trusses is important for fire officers to understand, as the structural integrity and behavior of truss systems under fire conditions can significantly affect firefighting strategies and safety measures during firefighting operations. Understanding the prevalence of truss systems can help fire officers prepare for the specific challenges encountered during emergencies involving such constructions.