Of the wood framing systems used in residential construction today, which is the most common?

The platform-frame system is the most common wood framing method used in residential construction today due to its efficiency, cost-effectiveness, and ease of construction. In this system, each floor of the building is built as a separate platform, allowing for quicker assembly and more straightforward integration of utilities, insulation, and structural elements.

The design minimizes complexity, as walls are framed on top of the floor platform, providing a stable base that aligns and supports subsequent walls. This approach also maximizes the use of materials, as it allows for uniformity in the dimensioning of lumber and simplifies the labor process. Additionally, platform framing accommodates standard-sized building materials, which can lead to reduced waste and lower overall costs.

In contrast, other framing systems like balloon-frame, while historically significant, are less commonly used today primarily due to complexities in construction and fire safety concerns. The post-and-beam system is more prevalent in certain architectural styles but is not as widely adopted for standard residential buildings because it often requires more skilled labor and greater material costs. Steel-frame construction is typically reserved for commercial or larger residential projects due to its structural advantages but is not the standard for most residential construction. Therefore, the platform-frame system remains the predominant choice in modern residential building practices.