Which construction type is known to give firefighters problems with hidden void spaces?

Balloon construction is known for its unique framing technique that creates continuous vertical void spaces from the foundation to the roof. This construction style features long, continuous studs that run the entire height of the building, which can allow fire to travel rapidly through these hidden spaces. As flames or heat penetrate the walls, they can move between floors undetected, complicating firefighting efforts. Firefighters may struggle to locate the source of the fire or gauge its extent because the fire can spread quickly through these concealed areas, failing to reveal itself on the surface.

In contrast, other construction types, such as concrete block and steel frame, do not typically present the same hidden void issues. Concrete block walls are firmer and less prone to hidden spaces, while steel framing generally contains a more rigid structure that bounds fire spread more effectively. Log cabins, although they have their challenges, do not have the continuous vertical channels that balloon construction does, making balloon construction distinctly problematic in fire situations.