Name one key indicator of potential structural collapse in a burning building.

The indication of sagging or bowing in structural members is a critical sign of potential structural collapse in a burning building. This physical distortion can result from the intense heat of the fire weakening the materials that provide structural integrity, such as timber and steel. When structural members lose their strength, they can no longer support the weight they are designed to, leading to a potential failure.

Identifying such deformities is crucial for firefighters, as it helps them assess the stability of the building and make informed decisions about tactics and evacuations. When sagging or bowing is observed, it may signal that the roof or walls are at risk of failing, thereby warning personnel of imminent danger. Understanding these indicators allows firefighters to prioritize safety and make strategic choices while managing firefighting efforts.