Buildings or spaces in noncombustible construction group I are those in which the walls, exitways, shafts, structural members, floors, and roofs are constructed of noncombustible materials and assemblies affording the fire-resistance ratings specified in table 3-4. The noncombustible construction group I consists of classes I-A, I-B, I-C, I-D, and I-E.
Includes buildings and spaces in which the bearing walls and other major structural elements are generally of four-hour fire-resistance rating.
Includes buildings and spaces in which the bearing walls and other major structural elements are generally of three-hour fire-resistance rating.
Includes buildings and spaces in which the bearing walls and other major structural elements are generally of two-hour fire-resistance rating.
Includes buildings and spaces in which the bearing walls and other major structural elements are generally of one-hour fire-resistance rating.
Includes buildings and spaces in which the bearing walls and other major structural elements generally have no fire-resistance rating.