An office building with the highest fire resistance rating constructed using noncombustible or limited combustible materials is classified as what type?

An office building constructed using noncombustible or limited combustible materials and possessing the highest fire resistance rating is classified as Type I. This classification indicates that the building has been designed to meet stringent fire safety requirements, utilizing materials that resist fire and help prevent the spread of flames and smoke. Type I construction is typically seen in high-rise buildings where structural integrity is critical, protecting both occupants and property during a fire event.

In stark contrast, the other types of construction have varying degrees of fire resistance and materials. Type II construction allows for some combustible materials and has a lower fire resistance compared to Type I. Type III construction features a combination of noncombustible exterior walls but allows combustible interior materials. Type IV, known as heavy timber construction, utilizes solid wood beams and requires specific fire resistance measures but does not offer the same degree of protection as Type I. Thus, Type I stands out as the safest and most fire-resistant option for an office building.