What is the minimum size of self-drilling tapping screws required for attaching structural sheathing to cold-formed steel studs?

The correct choice is based on standard practices and guidelines for connecting structural sheathing to cold-formed steel studs. The minimum size of self-drilling tapping screws specified for this application is No. 8. This size is generally recognized as providing sufficient shear strength and pull-out resistance to effectively secure the sheathing material, ensuring adequate structural integrity.

When attaching sheathing to cold-formed steel studs, it's essential to select screw sizes that will not only penetrate the steel but also hold the sheathing firmly in place. While other sizes such as No. 6, No. 10, or No. 12 may be used in certain contexts, No. 8 is specifically designated as the minimum to meet structural requirements and ensure compliance with building codes. This choice balances strength with the ease of installation, allowing optimal performance in the framework of modern construction.