Which statement about Gypsum System standard sizes is true?

• A. Widths: five feet is standard
• B. Lengths: six feet are common
• C. Lengths: eight, ten, twelve, fourteen, sixteen feet are common
• D. Thicknesses: two inches and three inches are standard

Answer: (C)

Gypsum board is stocked in a few standard sizes to fit typical rooms and reduce waste. The common dimensions are widely 4 feet wide, with lengths that run from eight to sixteen feet. This means boards are typically available in eight, ten, twelve, fourteen, or sixteen-foot lengths, which matches the option stating those lengths are common. The other statements don’t fit standard practice: five-foot-wide boards aren’t a typical stock width, six-foot lengths aren’t a standard size, and two- or three-inch-thick boards aren’t used for ordinary gypsum wallboard (the usual thicknesses are about 1/2 inch and 5/8 inch).