Definition & Operational Usage
Thermal layering refers to the stratification of air temperatures within a fire compartment, where lighter, hotter gases rise and accumulate near the ceiling, while cooler, denser air remains closer to the floor. Not to be confused with thermal stratification, which may occur in other contexts, thermal layering is critical for understanding fire behavior and smoke movement. This knowledge aids firefighters in making informed decisions regarding ventilation strategies and safe movement within the Hot Zone, particularly when utilizing TIC devices to assess conditions.
Category context: Core tactics, command, suppression, ventilation, search, and water supply terminology used on the fireground.