The fire-resistance-rated wall detail calls for Type X gypsum board. Which board thickness is commonly associated with Type X wallboard in rated assemblies?
Correct Answer
C) 5/8 in.
Type X gypsum board is commonly 5/8 in. thick and manufactured with a fire-resistant core for rated assemblies. Other choices are standard or specialty thicknesses that do not match the common Type X designation.
Why This Is the Correct Answer
Type X gypsum board is commonly 5/8 in. thick and manufactured with a fire-resistant core for rated assemblies. Other choices are standard or specialty thicknesses that do not match the common Type X designation.
Why the Other Options Are Wrong
Option A: 3/8 in.
The trap in A is 3/8 in. That selection is wrong because 3/8 in. is a different published number than the cited Type X gypsum board value; Type X gypsum board description supports 5/8 in.
Option B: 1/2 in.
Choice B gives 1/2 in. Its specific error: 1/2 in. is a different published number than the cited Type X gypsum board value; Type X gypsum board description supports 5/8 in. The accepted answer is 5/8 in.
Option D: 3/4 in.
In finishes, 3/4 in. is the wrong selection for Type X gypsum board: 3/4 in. is a different published number than the cited Type X gypsum board value; Type X gypsum board description supports 5/8 in.
Memory Technique
Make type X gypsum board a tabbed card: cite the exact condition, then choose 5/8 in.
Reference Hint
Open Gypsum Construction Handbook, 7th Ed., 2014; use the index entry or section for "Type X gypsum board description" to confirm that Type X gypsum board is commonly 5/8 in.
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