What should be noted when assessing fire spread during an investigation?

When assessing fire spread during an investigation, noting the source of the ignition is crucial. The ignition source helps investigators understand how the fire started and the conditions that contributed to its spread. Identifying the source can reveal whether it was accidental, intentional, or due to equipment failure, aiding in determining the cause of the fire. This information is vital for understanding fire behavior, which can inform better prevention strategies in the future and offer insights into how quickly the fire spread through various materials and environments.

Factors like the presence of smoke alarms, the age of construction materials, and potential firefighter injuries are important considerations in the overall investigation but do not directly relate to the mechanics of fire spread itself. The ignition source serves as a fundamental element in establishing the timeline and dynamics of the fire's development.