CONSTRUCTION TYPE—MAXIMUM STORY HEIGHT
§ 57.11. Story height.
(a) C-4 occupancies shall be governed by the story height and construction type limitations as follows:
(1) Fireresistive construction modified.
(i) This shall be limited to three stories in height with a maximum of 3,000 square feet per story between exterior walls or 2-hour fire walls. Exit corridors and stair towers shall not be included in the 3,000 square feet.
(ii) All general provisions for fireresistive construction shall apply except that:
(A) Roof framing and sheathing may be of wood; however, the roofing material shall be Class A, B, or C.
(B) Floor construction shall be of incombustible material with a 1-hour fire rating.
(2) Noncombustible construction modified.
(i) This shall be limited to two stories in height with a maximum of 3,000 square feet per story between exterior walls or 2-hour fire walls. Exit corridors and stair towers shall not be included in the 3,000 square feet.
(ii) Construction shall be 1-hour rated construction in which bearing walls, columns, beams, other supporting members, ceiling/roof assemblies, floor/ceiling assemblies, stairways, and other openings through floors are of 1-hour rated construction.
(iii) Roof framing and sheathing may be of wood; however, the roofing material shall be Class A, B, or C.
(3) Ordinary construction modified.
(i) This shall be limited to two stories in height with 3,000 square feet per story between exterior walls or 2-hour fire walls. Exit corridors and stair towers shall not be included in the 3,000 square feet.
(ii) Construction shall be 1-hour rated construction in which bearing walls, columns, beams, other supporting members, ceiling/roof assemblies, floor/ceiling assemblies, stairways, and other openings through floors are of 1-hour rated construction.
(iii) Roofing shall be Class A, B, or C.
(4) Wood frame construction modified.
(i) This shall be limited to two stories in height with a maximum of 2,000 square feet per story between exterior walls or 2-hour fire walls. Exit corridors and stair towers shall not be included in the 2,000 square feet.
(ii) Construction shall be 1-hour rated construction in which bearing walls, columns, beams, other supporting members, ceiling/roof assemblies, floor/ceiling assemblies, stairways, and other openings through floors are of 1-hour construction.
(iii) The roofing material shall be Class A, B, or C.
(b) Apartment units shall be separated from each other and all other portions of the building by a minimum of 1-hour rated construction.
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