What type of wood framing method is being used when wall framing is constructed one floor at a time?

The correct answer is platform framing. This method involves constructing each floor level separately, beginning with the ground floor, where the walls are framed and then a floor structure is added on top. This creates a platform where the next level’s walls can be framed. The platform method is widely used in residential construction due to its efficiency and ease of assembly. It allows for the installation of utilities and insulation in the space between floors, promoting energy efficiency.

In contrast, balloon framing utilizes long vertical members that extend from the foundation all the way to the roof, making it a structurally different method that does not build one floor at a time. Post and beam construction involves larger framing members (posts and beams) and relies on a different structural system, while timber framing typically uses heavy timber and is known for its exposed joinery, which is also distinct from the platform method. Therefore, platform framing specifically corresponds to the described technique of constructing walls one floor at a time.