What is the minimum thickness of gypsum sheathing required in conventional light-frame construction?

In conventional light-frame construction, the minimum thickness of gypsum sheathing is indeed 1/2 inch. This thickness is specified to provide adequate fire resistance and structural integrity in the building assembly. Gypsum sheathing serves multiple purposes, such as enhancing the fire-resistance rating of exterior walls, improving sound dampening properties, and contributing to moisture control.

Choosing 1/2 inch as the minimum thickness ensures that the sheathing can effectively resist impact and shear forces, which are common in building applications. Thinner materials might not provide the necessary protection or additional benefits associated with fire resistance and structural performance. As a result, 1/2 inch is the standard thickness that balances strength, safety, and cost efficiency in conventional light-frame construction.