Type I - shall be of wood construction. The structural elements may be any of the materials permitted by the Code.
Type II - shall be of wood construction with protective fire-resistant materials and one-hour fire-resistive throughout, except, that permanent non-bearing partitions may use fire retardant treated wood within the framing assembly with one-hour resistivity.
Type III - shall be of masonry and wood construction. Structural elements may be any of the materials permitted by the Code provided, that the building shall be one-hour fire-resistive throughout. Exterior walls shall be of incombustible fire-resistive construction.
Type IV - shall be steel, iron, concrete, or masonry construction and walls, ceiling and permanent partitions shall be of incombustible fire-resistive construction, except, that permanent non-bearing partitions of one-hour fire-resistive construction may use fire-retardant treated wood within the framing assembly.
Type V - shall be four-hour fire-resistive throughout and the structural elements shall be of steel, iron, concrete, or masonry construction.
GROUP D -
Division 1 - Mental hospitals, mental sanitaria, jails, prisons, reformatories, and buildings were personal liberties of inmates are similarly restrained.
Division 2 - Nurseries for full-time care of children under kindergarten age, hospitals, sanitaria, nursing homes with non-ambulatory patients, and similar buildings each accommodating more than five persons.
Division 3 - Nursing homes for ambulatory patients, homes for children of kindergarten age or over, each accommodating more than five persons: Provided, that Group D Occupancies shall not include buildings used only for private or family group dwelling purposes.