Which thickness is NOT listed among standard Gypsum System thicknesses?

• A. 1/2"
• B. 5/8"
• C. 2"
• D. 3/4"

Answer: (C)

Thickness choices for gypsum systems are set to fit typical wall cavities and balance weight, handling, and fire performance. In standard gypsum board products used for walls and ceilings, the common stock thicknesses are 1/2 inch for everyday construction and 5/8 inch when enhanced fire resistance or rigidity is needed; some assemblies also use 3/4 inch for specific high-performance applications. A thickness like two inches would be far beyond what is manufactured as a standard gypsum board and would create fit and structural issues, requiring different framing and attachment methods. Because of that, two inches is not listed among standard Gypsum System thicknesses.