Where walls are concerned, "Traditional" residential wood framing uses 2x4 studs at 16-inches apart. "New" wood framing may use 2x6 studs 24-inces apart. The thinking is the "new" method allows for improved the thermal performance of the structure, without sacrificing the strength of the structure. (Fewer, stronger studs further apart versus more, weaker studs closer together.)
Building & Construction Methods: Only your local "Building Inspector" can tell you what the legal requirements are for your project. Local jurisdictions choose which building codes and design standards to enforce. You won't know which apply to your project unless you ask.
