The ironic thing I read was asbestos thermal protection for the beams was removed on health concerns. The building was being transitioned too slowly, obviously fire on a tall building is hard to put out and while its original design was compromised with some steel beams left uncoated with no protection to fire or rust this allowed the vulnerability which unfolded that day. Though not achieving melting point, the tensile strength of the structure was compromised by extremes of the fire such that it weakened enough to collapse
inferior to asbestos-containing fireproofing. The nonasbestos materials are less dense, less uniform, and less cohesive to the surface. Rust scale had not been removed prior to applying the fireproofing
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