Trainers caution on roof stability and collapse indicators for metal commercial buildings

Instructors discussed roof operations on pre-engineered metal buildings, advising crews to check stability before stepping onto roofs and to "poke" and sound decking where they plan to stand. One exchange referenced beam spacing varying "two foot" up to "five" feet depending on decking and red-iron framing, warning that some spans are large and may not support personnel without careful checks.

Trainers also noted that metal components heat and cool quickly; rapid cooling after water application can make members brittle and increase failure risk. The training emphasized situational awareness and using command emergency traffic or mayday if interior conditions indicate imminent collapse.