In Type III construction, exterior walls are non-combustible or limited and interior structural members are partially or entirely wood. Which type is described?

• A. Type I
• B. Type II
• C. Type III
• D. Type V

Answer: (C)

Type III construction is ordinary construction with exterior walls that are noncombustible or limited in combustible content, while the interior structural frame is wood. This setup provides a fire-resistant exterior shell to help slow flame spread, but uses wood for the interior framework to keep costs down and allow flexible interior layouts. That blend—noncombustible or limited exterior walls paired with wood interior members—is what defines this type. The other types differ in where wood is allowed: some require noncombustible material for both exterior and interior, some use heavy timber for interior only, and Type V uses wood framing throughout.