Which historical construction method is known for vertical studs that run from foundation to roof, creating hidden fire spread paths?

• A. Platform framing
• B. Concrete block
• C. Balloon-frame construction
• D. Steel frame

Answer: (C)

Balloon-frame construction uses long, continuous vertical studs that run from the foundation all the way to the roof. That creates tall, unobstructed cavities inside the walls, so fire can travel upward through the studs and from one floor to the next while remaining hidden behind wall finishes. This is what people refer to when they talk about hidden fire spread paths.

In contrast, platform framing builds each story separately, with studs that don’t extend through multiple floors, and fire blocks or blocking interrupt vertical paths, making it harder for fire to climb unseen. Concrete block and steel-frame construction don’t rely on those continuous wood studs spanning from foundation to roof, so they don’t produce the same kind of hidden vertical fire paths.