What is a common characteristic of fires in bowstring truss buildings?

Fires in bowstring truss buildings are often characterized by the presence of heavy smoke showing from the exterior. This is due to the construction of these types of buildings, which typically have open floor plans and large unobstructed spaces that allow for quick fire spread. The construction materials used in truss systems can also contribute to the rapid development of smoke, often leading to limited visibility and increased hazards for both firefighters and occupants.

The bowstring truss itself can fail rapidly under heat, leading to dangerous structural conditions. This allows the fire to produce significant amounts of smoke before it becomes fully visible as flames through windows or other openings. Addressing smoke conditions, therefore, is crucial for safety and effective firefighting strategies in these structures. Understanding this characteristic allows firefighters to anticipate the behavior of fire within these buildings and to develop appropriate tactics for fire attack and ventilation.