Which of the following is an indicator of collapse potential?

Cracks in bricks or blocks are a significant indicator of collapse potential because they reveal underlying structural weaknesses that compromise the integrity of a building. When a structure has visible cracks, it often means that there has been movement within the building, whether from settling, foundation issues, fire exposure, or other stresses. These cracks can widen over time, especially under load or in response to environmental factors, which may lead to partial or total collapse.

For firefighters and rescue personnel, identifying such cracks is critical during assessments to ensure their safety and the safety of any occupants. Recognizing these types of signs helps inform decisions about evacuation, rescue tactics, and where to position resources effectively. Understanding the structural condition of a building is key to anticipating and mitigating the risks associated with a potential collapse.