OCFA Strategy and Tactics – Truck Operations Practice Test

Panelized arch roofs behave like lightweight construction when exposed to fire. The arch and panelized components can lose strength and fail with little warning as heat builds, so the safest and most accurate mindset is to treat this roof as a lightweight roof (LWP). That means planning for possible collapse, avoiding routine roof operations, and prioritizing safety zones and alternative tactics rather than assuming the roof will support workers or heavy loads.

Staying on the purlins or arches would place personnel on the very members most at risk of failure, which is why that approach isn’t appropriate. The other options address ventilation or route choice rather than the fundamental hazard of the roof’s construction under fire.