What is NOT an indicator of possible structural collapse?

The presence of hydrogen cyanide is not an indicator of possible structural collapse. Instead, it is a toxic gas often associated with combustion and can pose serious health risks to firefighters and occupants during a fire situation. Its detection typically indicates fire-related hazards rather than structural integrity issues.

In contrast, bubbling paint, cracks in walls, and doors and windows that stick all provide visual and physical signs that a structure may be at risk of collapse. Bubbling paint can suggest heat damage, moisture issues, or other conditions that may compromise the structural stability. Cracks in the walls can indicate shifting or settling of the foundation, which might result from fire damage or structural overload. Sticking doors and windows often signal warping or shifting of the frame due to heat and stress on the materials, which is common in cases where the integrity of the structure is at risk. These indicators are critical for firefighters to assess the safety of both the building and their own positions while operating in a hazardous environment.