What term does Frank Brannigan use to refer to the large void space created by open web trusses?

Frank Brannigan refers to the large void space created by open web trusses as "truss loft." This term captures the unique characteristics of trussed roof systems, where the design allows for a significant amount of open space between the trusses. The use of "loft" implies not just the physical volume, but also the potential for these spaces to be used for other purposes, such as storage or housing mechanical systems.

Understanding this terminology is crucial for fire officers and responders, as truss lofts can present specific hazards during firefighting operations. The open web structure can compromise the integrity of the roof under heat, and knowing about these spaces can inform strategies for ventilation, troop placement, and overall fire behavior management. This term is also significant in discussions about building construction and fire dynamics, which is essential knowledge in firefighting and risk assessment.