What are the two systems used to assemble wood-frame buildings?

The correct answer highlights the two primary systems used to construct wood-frame buildings: balloon-frame and platform-frame construction.

Balloon-frame construction is characterized by long, continuous vertical studs that run from the foundation to the roof, allowing for a lightweight structure that can be built quickly. This technique is particularly advantageous for its ability to create large, open interior spaces, as there are fewer bearing walls required.

Platform-frame construction, on the other hand, involves building each floor as a separate platform. In this method, the floor of one level serves as the platform for the walls of the next level. This system generally provides greater structural stability and easier assembly compared to balloon-frame construction, as each floor is built independently and can be completed before moving up to the next level.

Both methods have become standard in residential construction due to their efficiency, cost-effectiveness, and the availability of materials. By understanding these two systems, one can appreciate the evolution of wood-frame building techniques and their significance in modern construction practices.