There were approximately seven employees on the trusses near the center of the trusses. shortly after the three bundles were placed the employees observed, at approximately 2:10 p.m, that the roof trusses, except for the five trusses on the south side, suddenly collapsed at the center.. Other collapse hazards buildings built with bowstring truss roof structures have a number of other factors that can make them susceptible to collapse. for example, bowstring trusses can be constructed of wood or steel, but most often, they�re made of wood�often heavy timber.. Roof collapse kills three three more firefighters are lost when a truss roof in an evacuated building collapses during a fire. by ed comeau hackensack, new jersey. chesapeake, virginia. branford, connecticut. in each of these towns, lightweight wood truss roof collapses have killed and.
