How does fire typically travel in a structure?

Fire typically travels in a structure by moving both horizontally and vertically, generally following the path of least resistance. This characteristic behavior of fire is influenced by several factors, including the materials present in the environment, the structure's layout, and the airflow within the space.

In a compartmented structure, fire will often move upwards through stairwells, ventilation systems, or other vertical openings because heat rises. Simultaneously, it spreads horizontally along walls, ceilings, and floors as it seeks combustible materials to consume.

The path of least resistance is crucial because it dictates how fire spreads through the building's design elements, such as windows, doorways, and gaps in the structure. Failing to account for this accurate depiction of fire behavior can mislead responses to fire prevention and containment strategies. Understanding the multidirectional nature of fire travel is essential for effective fire investigation and safety measures.