What is generally the minimum thickness for exterior walls in wood-frame construction?

In wood-frame construction, the minimum thickness for exterior walls is generally specified as 6 inches to ensure both structural integrity and insulation performance. This thickness allows for the inclusion of structural elements such as studs, sheathing, and insulation while adhering to building codes and industry standards.

A wall thickness of 6 inches provides enough space to accommodate typical stud configurations (such as 2x6 lumber), which are often used in residential construction to improve thermal performance and energy efficiency. This thickness permits adequate insulation materials to be installed, which contributes to the overall energy efficiency of the structure.

While thinner walls may be suitable for certain applications or materials, they typically do not provide the necessary R-value for insulation or sufficient structural support that 6 inches can offer. Therefore, the choice of 6 inches aligns with best practices in building design, ensuring the building performs well in terms of both comfort and durability.