Type III interiors are typically constructed from which material?

Type III interiors are typically constructed from which material?

• A. Noncombustible gypsum
• B. Concrete blocks
• C. Combustible wood component
• D. Metal studs with drywall

Answer: (C)

Type III construction is defined by noncombustible exterior walls with interior framing that can be combustible. The interior is typically built with wood components, such as dimensional lumber and wooden studs, because this matches the allowance for interior framing to be combustible while exterior walls remain noncombustible. Gypsum is a noncombustible finishing material rather than the main interior structural material, so it isn’t what the interiors are “constructed from.” Concrete blocks can be used for interior walls in some cases, but they’re not the typical interior framing material in Type III. Metal studs with drywall are noncombustible and used in some builds, but wood framing is the most common interior material in this construction type.

Type III construction is defined by noncombustible exterior walls with interior framing that can be combustible. The interior is typically built with wood components, such as dimensional lumber and wooden studs, because this matches the allowance for interior framing to be combustible while exterior walls remain noncombustible. Gypsum is a noncombustible finishing material rather than the main interior structural material, so it isn’t what the interiors are “constructed from.” Concrete blocks can be used for interior walls in some cases, but they’re not the typical interior framing material in Type III. Metal studs with drywall are noncombustible and used in some builds, but wood framing is the most common interior material in this construction type.