What type of building construction is defined as having structural components made of noncombustible materials?

The distinction of fire-resistive construction lies in its use of materials that are noncombustible, which significantly enhances the building's ability to withstand fire exposure and limit fire spread. This type of construction typically incorporates materials such as concrete, steel, and masonry that do not ignite easily or emit toxic fumes when exposed to high temperatures. Fire-resistive structures are designed to endure fire conditions for a predetermined duration, thereby providing additional safety for occupants and firefighting personnel.

In contrast, heavy timber construction employs large wooden beams and is notable for its durability and strength, but it is still considered combustible. Ordinary construction combines combustible and noncombustible materials, typically found in residential buildings. Legacy construction refers to older building styles that may not conform to modern safety codes and can include a mix of materials without a consistent classification in terms of fire resistance. Therefore, fire-resistive construction is uniquely characterized by its noncombustible components, making it the correct answer.