Finish TradesQuestion 247 of 700
Fire-rated gypsum board used to achieve a one-hour wall assembly is commonly Type X. Its typical nominal thickness is:
a.1/4 inch
b.3/8 inch
c.1/2 inch
d.5/8 inch
Explanation
Type X gypsum board is typically 5/8 inch thick, with a glass-fiber-reinforced core that resists fire long enough for rated assemblies. 1/4 and 3/8 inch are thin/utility boards, and 1/2 inch is standard (non-Type X) wall board.
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