Commercial Building Inspector B2Wall Construction and Wall CoveringsHard
A commercial building inspector is reviewing the design for a new 1-hour fire-resistance-rated interior nonbearing wall constructed with cold-formed steel studs. The plans specify 25-gauge (0.018-inch design thickness) steel studs. What is the minimum flange width required for these studs?
- A1 1/4 inches
- B1 3/8 inches
- C1 5/8 inches
- D1 3/4 inches
Show answer & explanationAnswer & explanation
Correct answer: B. 1 3/8 inches
According to IBC Table 2211.1.1(1) (for cold-formed steel stud construction), for 25-gauge (0.018-inch design thickness) studs in a 1-hour fire-resistance-rated nonbearing wall, the minimum flange width required is 1 3/8 inches.
Why the other options are wrong
- A. This flange width is typically associated with heavier gauge studs or non-rated assemblies.
- C. This flange width is typically associated with heavier gauge studs or specific structural applications.
- D. This flange width is typically associated with heavier gauge studs or specific structural applications.
Cold-Formed Steel Stud Flange Width
The minimum flange width of cold-formed steel studs is specified based on the stud gauge (thickness), wall fire-resistance rating, and whether the wall is load-bearing or nonbearing, as detailed in IBC tables.
- Ensures structural integrity and fire performance.
- Critical for attaching gypsum board.
- Refer to IBC Table 2211.1.1(1) for specifics.
Memory trick: Steel studs must be strong and wide, for fire resistance, they cannot hide.