In wall framing, which type of studs must not support more than just a roof and ceiling?

Utility-grade studs are specifically designed for non-load-bearing applications, meaning they should not be subjected to significant structural loads beyond supporting a roof and ceiling. These studs are typically less expensive and may have more imperfections, making them less suitable for critical structural components. Therefore, their use is generally limited to areas where they do not have to support additional weight beyond their intended purpose, which is providing the basic framing for ceilings and roofs.

In contrast, light-grade and structural-grade studs are intended for load-bearing applications. Light-grade studs can be used in some structural applications, while structural-grade studs are specifically designed to carry significant loads and stresses. This distinction highlights the importance of selecting the appropriate type of stud based on the intended structural requirements of the framing system.