Exterior walls are usually masonry in construction, with interior lumber dimensions described as staggering and large columns and beams.

• A. Type II - Non-Combustible
• B. Type IV - Heavy Timber
• C. Type V - Wood Frame Construction
• D. Type III - Ordinary Construction

Answer: (D)

The scenario describes a building with a masonry exterior shell and interior framing that is wood, with sizeable timber members inside. That combination points to Ordinary Construction. In this type, exterior bearing walls are noncombustible (often masonry), while the interior framing and structural members can be wood, including large columns and beams when needed to support floors and roofs. The masonry exterior provides the main fire resistance, while the interior wood framing is allowed, which fits the description given.

Other construction types don’t match as well: all interiors would be noncombustible in Non-Combustible (Type II), interior heavy timber as the primary system is the hallmark of Heavy Timber (Type IV), and wood framing on both exterior and interior is characteristic of Wood Frame (Type V) with wood exterior, not masonry. So Ordinary Construction best fits the described mix of masonry exterior and interior wood with large wooden structural members.