How quickly can unprotected lightweight steel and wooden trusses fail during a fire?

Unprotected lightweight steel and wooden trusses are known for their susceptibility to rapid failure in the event of a fire. The time frame of 5 to 10 minutes is critical because both types of trusses lack the fire resistance provided by protective coatings or materials. In a fire scenario, the lightweight nature of these trusses can lead to quick degradation under high temperatures.

Wooden trusses can ignite and burn away swiftly due to their reduced mass and the way they are constructed, while unprotected lightweight steel trusses can lose their structural integrity quickly as the steel weakens when exposed to high heat. The intense conditions of a fire can cause these materials to fail rapidly, reinforcing the importance of understanding the behavior of different construction elements in fire scenarios for effective fire safety planning and response strategies.