According to a NIOSH study, unprotected lightweight engineered I joist floor assemblies fail after how many minutes of fire exposure?

The findings of the NIOSH study indicate that unprotected lightweight engineered I joist floor assemblies typically exhibit structural failure after around 6 minutes of fire exposure. This data highlights the vulnerability of lightweight construction materials to heat and fire, emphasizing the critical importance of using fire-resistant materials and protective measures in building design.

Understanding the timeframe of 6 minutes is particularly vital for firefighting strategies and tactics, as it underscores the urgency for firefighters to assess and respond effectively to structural integrity concerns during fire incidents. Knowledge of such vulnerabilities can aid in planning and executing evacuation and suppression operations, ultimately enhancing community safety and firefighter effectiveness. Familiarity with this time frame can also inform training and preparation for firefighters, ensuring that they are aware of the risks associated with lightweight construction types in emergencies.