Interior examination should include which elements?

• A. The ignition source rating
• B. The fire alarm system status
• C. Fire pattern, melted metal, and glass, damage to structure and contents
• D. The landscaping around the building

Answer: (C)

Interior examination focuses on the physical evidence left inside the structure that shows how the fire behaved, where it started, and how it spread. The best indicators are fire patterns, which reveal flame exposure, direction, and intensity; melted metal and damaged glass, which indicate the temperatures reached and the heat concentration in specific areas; and overall damage to the structure and contents, which shows how deeply materials were affected and where the fire was most severe. Together, these signs help pinpoint the origin and progression of the fire.

Ignition source rating and fire alarm system status are documentation or system-related details rather than the primary internal indicators of fire behavior, and landscaping around the building is outside the interior evidence, so they aren’t part of the interior examination.