What is the maximum unsupported height for an interior wall with a 38x64 mm stud size?

The maximum unsupported height for an interior wall using 38x64 mm studs is generally considered to be 3.0 meters. This height is established based on building codes and structural engineering principles, which take into account the load-bearing capacity of the studs, their spacing, and the overall stability of the wall assembly.

At 3.0 meters, the wall maintains sufficient strength to resist bowing, buckling, and other deformations under normal conditions while still allowing for installation and handling considerations. Beyond this height, there is an increased risk of structural failure due to the reduced effectiveness of the studs in providing lateral support.

For other height options presented, such as 2.5 meters and 3.5 meters, while they may be within feasible limits for certain conditions or specific materials and treatments, they do not represent the standard maximum height for unsupported walls built with that specific stud size. A height of 4.0 meters significantly exceeds the general recommendations for stability and safety in typical construction scenarios.