Which gypsum board size is described as 4' x 6' horizontal at 9' ceilings?

• A. 4' x 6' horizontal at 9' high ceilings
• B. 4' x 8' (most common)
• C. 4' x 9'
• D. 4' x 12'

Answer: (A)

Understanding gypsum board specifications means matching the described panel size and how it’s installed. Here the description tells you the panel is four feet by six feet and that it’s placed horizontally on a ceiling that’s nine feet high. That exact size and orientation is what the description conveys, so it’s the correct interpretation. The other options list more common sizes (four by eight, four by nine, four by twelve), which don’t match the four-by-six dimension described, so they don’t fit the given specification.