What action should firefighters take upon identifying signs of thermal layering?

When firefighters identify signs of thermal layering, proceeding with caution is essential. Thermal layering occurs when there are different temperature gradients within a fire environment, often with cooler air near the floor and hotter air closer to the ceiling. This condition can indicate potential danger, such as the possibility of flashover, where highly combustible gases ignite suddenly due to a dramatic rise in temperature.

By proceeding with caution, firefighters can carefully assess the situation and implement strategic measures while minimizing risks. This cautious approach allows them to evaluate the extent of the layering, consider the conditions inside the structure, and determine the best tactics to use in suppression efforts. Firefighters must remain vigilant because the thermal layers can shift, potentially leading to rapid changes in the fire behavior.

In contrast, actions such as immediately extinguishing flames or enhancing ventilation might not be suitable because they could disrupt the existing thermal layering and lead to sudden and dangerous conditions. Assessing structural integrity is also important, but it doesn't adequately address the immediate risks posed by thermal layering itself. Therefore, caution is the most prudent response to ensure the safety of both firefighters and potential victims.