1) Type I - Type I buildings shall be of wood construction. The structural elements may be any of the materials permitted by this Code.(2) Type II - Type II buildings 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.(3) Type III - Type III buildings shall be of masonry and wood construction. Structural elements may be any of the materials permitted by this Code: Provided, that the building shall be one-hour fire-resistive throughout. Exterior walls shall be of incombustible fire-resistive construction.(4) Type IV - Type IV buildings shall be of steel, iron, concrete, or masonry construction. Walls, ceilings, 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.(5) Type V - Type V buildings shall be fire-resistive. The structural elements shall be of steel, iron, concrete, or masonry construction. Walls, ceilings, and permanent partitions shall be of incombustible fire-resistive construction.

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