A drywall installation requires fire-rated assemblies. You're using 5/8" Type X drywall on both sides of steel studs. What fire rating does this typically achieve?
Correct Answer
A) 1 hour
A wall assembly with 5/8" Type X gypsum board on both sides of steel studs typically achieves a 1-hour fire rating. This is a common fire-rated assembly used in commercial construction.
Why This Is the Correct Answer
A wall assembly with 5/8" Type X gypsum board on both sides of steel studs is a standard 1-hour fire-rated assembly recognized by building codes and UL listings. Type X drywall contains special additives that help it resist fire for extended periods. The 5/8" thickness on both sides of the steel framing provides sufficient mass and fire-resistant properties to achieve the 1-hour rating. This assembly is commonly specified in commercial construction for corridor walls, tenant separations, and other applications requiring 1-hour fire resistance.
Why the Other Options Are Wrong
Option C: 30 minutes
2 hours would require much more substantial construction, such as masonry, concrete, or multiple layers of fire-rated drywall with special assemblies.
Option D: 1.5 hours
30 minutes is insufficient for this robust assembly. A 30-minute rating would typically be achieved with thinner drywall or single-sided applications.
Memory Technique
Think '5/8 both sides = 1 hour' - the symmetrical construction (same thickness on both sides) gives you the standard 1-hour rating.
Reference Hint
Florida Building Code Chapter 7 (Fire and Smoke Protection Features) and UL Fire Resistance Directory for assembly ratings
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