What construction method allows for open channels from the foundation to the attic?

Balloon framing is a construction method that facilitates vertical spaces or channels running continuously from the foundation to the attic. This is achieved by using long, continuous framing members known as studs that extend from the bottom plate at the foundation to the top plate at the eaves, providing a pathway for air movement, structural support, and utility installations like electrical wiring and plumbing.

In balloon framing, the exterior walls are typically constructed with these long studs that do not rest on a floor platform; instead, they are fastened directly to the foundation and extend straight up to the roof. This design was more common in older buildings and can increase the risk of rapid fire spread since the continuous channels can allow flames and heat to travel quickly from the lower levels to the upper levels.

Other construction methods such as platform framing, heavy timber framing, and wood frame construction do not share this characteristic of providing uninterrupted vertical channels. In platform framing, for example, each floor is built separately using individual, shorter studs, which create fire stops that can help slow the spread of fire. Heavy timber framing relies on larger, solid wood members but does not provide those continuous vertical channels seen in balloon framing.