Which of the following options is NOT a feature of ordinary construction?

In ordinary construction, the defining characteristics typically include a combination of various materials, the use of combustible structural members, and often single structural framing members, depending on the design. The use of highly fire-resistant materials is not a feature of ordinary construction; rather, it is associated with fire-resistant or non-combustible construction types.

The key element that sets ordinary construction apart is its reliance on materials that may be combustible, such as wood or other organic materials. While they can provide structural integrity, they also make these buildings more susceptible to fire. The presence of highly fire-resistant materials would indicate a structural approach aimed at enhancing safety against fire, which is contrary to the essence of ordinary construction, where the materials used do not prioritize fire resistance.

In summary, while the other choices align with principles found in ordinary construction, the inclusion of highly fire-resistant materials signifies a deviation from what is expected in this construction type.