Commercial Building Inspector B2Wall Construction and Wall CoveringsHard
A commercial building inspector is reviewing the design for a cold-formed steel framed exterior wall. The design specifies 18-gauge (0.048 inch design thickness) C-shaped studs with a depth of 3-5/8 inches, spaced at 16 inches on center. Per IBC Section 2211.1.1, what is the maximum stud depth permitted for cold-formed steel wall studs when the nominal stud thickness is 0.048 inch?
- A8 inches
- B6 inches
- C3-5/8 inches
- D4 inches
Show answer & explanationAnswer & explanation
Correct answer: B. 6 inches
According to IBC Section 2211.1.1, for cold-formed steel wall studs with a nominal thickness of 0.048 inch (18 gauge), the maximum stud depth permitted is 6 inches. The 3-5/8 inch depth in the scenario is acceptable, but the question asks for the maximum permitted for that thickness.
Why the other options are wrong
- A. 8 inches is only permitted for thicker gauge studs (e.g., 0.054 inch or greater).
- C. 3-5/8 inches is a common stud depth, but not the maximum permitted for 0.048 inch thickness.
- D. 4 inches is a valid stud depth but not the maximum permitted for 0.048 inch thickness.
Cold-Formed Steel Stud Depth Limits
The maximum depth of cold-formed steel wall studs is limited by their nominal thickness to ensure adequate strength and rigidity, preventing buckling and excessive deflection.
- Limits are based on stud thickness (gauge).
- Thicker studs allow for greater depths.
- Refer to IBC Section 2211.1.1 for specific values.
Memory trick: Steel's Stature: Thickness Trumps Tallness.