What is the standard thickness of a stud wall and how does it vary based on construction materials and building codes?

The standard thickness of a stud wall is typically 3.5 inches for interior walls and 5.5 inches for exterior walls. However, this can vary based on the construction materials used and building codes in place. Some walls may be thicker to accommodate insulation or structural requirements, while others may be thinner in certain situations. It is important to consult local building codes and regulations to determine the appropriate thickness for a specific project.