What kind of hazards should you look for in structural voids during overhaul?

• A. Visible flames that can be seen from outside.
• B. Hidden fires, gas pockets, electrical wiring, and insulation that can propagate heat.
• C. Water leaks in the structure.
• D. Roof damage from collapse.

Answer: (B)

In overhaul, the focus is on concealed ignition sources inside structural voids. These spaces can trap heat, embers, and vapors, allowing fire to survive and rekindle even when visible flames aren’t present. The hazards you must look for are hidden fires, pockets of gas or fuel vapors that could ignite, electrical wiring that may be damaged or pose a shock or arc risk, and insulation or other materials in the void that can retain and transmit heat, enabling fire to spread. These conditions create a real rekindle risk and can injure crews if not found and controlled. While visible flames, water leaks, and roof damage are also safety concerns, they don’t capture the specific danger posed by concealed ignition sources inside void spaces.