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Title: Section 303  •  Size: 16526

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SECTION 303 - REQUIREMENTS FOR GROUP A OCCUPANCIES

303.1 General.

303.1.1 Group A Occupancies defined. Group A Occupancies include the use of a building or structure, or a portion thereof, for the gathering together of 50 or more persons for purposes such as civic, social or religious functions, recreation, education or instruction, food or drink consumption, or awaiting transportation. A room or space used for assembly purposes by less than 50 persons and accessory to another occupancy shall be included as a part of that major occupancy. Assembly occupancies shall include the following:

Division 1. A building or portion of a building having an assembly room with an occupant load of 1,000 or more and a legitimate stage.

Division 2. A building or portion of a building having an assembly room with an occupant load of less than 1,000 and a legitimate stage.

Division 2.1. A building or portion of a building having an assembly room with an occupant load of 300 or more without a legitimate stage, including such buildings used for educational purposes and not classed as Group B or E Occupancies.

Division 3. A building or portion of a building having an assembly room with an occupant load of less than 300 without a legitimate stage, including such buildings used for educational purposes and not classed as Group B or E Occupancies.

Division 4. Stadiums, reviewing stands and amusement park structures not included within other Group A Occupancies. Specific and general requirements for grandstands, bleachers and reviewing stands are to be found in Chapter 10.

303.1.2 Occupancy separations. For occupancy separations, see Table 3-B.

303.1.3 Amusement buildings. Amusement buildings shall conform with the requirements of this code for their occupancy classification in addition to the provisions set forth in Sections 408, 904.2.3 and 1013.6.

EXCEPTION: Amusement buildings or portions thereof which are without walls or a roof and constructed to prevent the accumulation of smoke in assembly areas.

303.2 Construction, Height and Allowable Area.

303.2.1 General. Unless otherwise specified in this section, buildings or portions of buildings classed in Group A Occupancy, because of the use or character of the occupancy, shall be limited to the types of construction set forth in Table 5-B, and shall not exceed in area or height the limits specified in Sections 504, 505 and 506.

303.2.2 Special provisions.

The roof-framing system for the roof-ceiling assembly in one-story portions of buildings of Type II One-hour, Type III One-hour or Type V One-hour construction may be of unprotected construction when such roof-framing system is open to the assembly area and does not contain concealed spaces.

Stages and platforms shall be constructed in accordance with the provisions of Section 405.

The slope of the main floor of an assembly room shall not exceed the slopes permitted in Section 1007.

Group A assembly rooms having an aggregate occupant load of 1,000 or more shall not be located in a basement, except basements in buildings of Type I or Type II-F.R. construction.

Gymnasiums and similar occupancies may have floor surfaces constructed of wood or unprotected steel or iron.

In gymnasiums having an area not greater than 3,200 square feet (297 m²), 1-inch (25 mm) nominal thickness tight tongue-and-grooved boards or 3/4-inch (19 mm) plywood wall covering may be used on the inner side in lieu of fire-resistive plaster.

For attic space partitions and draft stops, see Section 708.

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303.2.2.1 Division 2.1 provisions. Division 2.1 Occupancies with an occupant load of 1,000 or more shall be of Type I, Type II-F.R., Type II One-hour, Type III One-hour or Type IV construction, except that the roof-framing system for one-story portions of buildings of Type II One-hour or Type III One-hour construction may be of unprotected construction when such roof-framing system is open to the assembly area and does not contain concealed spaces.

303.2.2.2 Division 3 provisions. Division 3 Occupancies located in a basement or above the first floor shall not be of less than one-hour fire-resistive construction.

Division 3 Occupancies with an occupant load of 50 or more which are located over usable space shall be separated from such space by not less than one-hour fire-resistive construction.

For Division 3 Occupancies with a Group S, Division 3 parking garage in the basement or first floor, see Section 311.2.2.

303.2.2.3 Division 4 provisions. Grandstands, bleachers or reviewing stands of Type III One-hour, Type IV or Type V One-hour construction shall not exceed 40 feet (12 192 mm) to the highest level of seat boards; 20 feet (6096 mm) in cases where construction is Type III-N or Type V-N; and 12 feet (3658 mm) in cases where construction is with combustible members in the structural frame and located indoors.

Division 4 structures other than Type III-N and Type V-N grandstands, bleachers, reviewing stands and folding and telescoping seating of open skeleton-frametype without roof, cover or enclosed usable space are not limited in area or height.

Erection and structural maintenance shall conform to these special requirements as well as with other applicable provisions of this code.

When the space under a Division 4 Occupancy is used for any purpose, including exits, it shall be separated from all parts of such Division 4 Occupancy, including exits, by walls, floor and ceiling of not less than one-hour fire-resistive construction.

EXCEPTIONS: 1. Exits under temporary grandstands need not be separated.

2. The underside of continuous steel deck grandstands when erected outdoors need not be fire protected when occupied for public toilets.

The building official may cause Division 4 structures to be reinspected at least once every six months.

Grandstands, bleachers or folding and telescoping seating may have seat boards, toeboards, bearing or base pads and footboards of combustible materials regardless of construction type.

Seating and exiting requirements for reviewing stands, grandstands, bleachers, and folding and telescoping seating are provided under Section 1021.

303.3 Location on Property. Buildings housing Group A Occupancies shall front directly on or have access to a public street not less than 20 feet (6096 mm) in width. The access to the public street shall be a minimum 20-foot-wide (6096 mm) right-of-way, unobstructed and maintained only as access to the public street. The main entrance to the building shall be located on a public street or on the access way.

For fire-resistive protection of exterior walls and openings, as determined by location on property, see Section 503 and Chapter 6.

303.4 Access and Exit Facilities. Exits shall be provided as specified in Chapter 10. (For special exiting requirements, see Section 1016.) Access to, and egress from, buildings required to be accessible shall be provided as specified in Chapter 11.

For amusement buildings, see Section 408.

303.5 Light, Ventilation and Sanitation. Light and ventilation shall be in accordance with Chapter 12. The number of plumbing fixtures shall not be less than specified in Section 2902.2.

303.6 Shaft and Exit Enclosures. Exits shall be enclosed as specified in Chapter 10.

Elevator shafts, vent shafts and other vertical openings shall be enclosed and the enclosure shall be as specified in Section 711.

303.7 Sprinkler and Standpipe Systems. When required by Section 904.2.1 or other provisions of this code, automatic sprinkler systems and standpipes shall be designed and installed as specified in Chapter 9.

303.8 Special Hazards. Stages shall be equipped with automatic ventilators as required in Section 405.3.3.

Chimneys and heating apparatus shall conform to the requirements of Chapter 31 of this code and the Mechanical Code.

Motion picture machine booths shall conform to the requirements of Section 408.

Proscenium curtains shall conform to the requirements set forth in U.B.C. Standard 4-1, which is a part of this code. (See Chapter 35, Part II.)

Class I, II or III-A liquids shall not be placed or stored in any Group A Occupancy.

When heating equipment rooms are required to be separated in accordance with Section 302.5, exterior openings in a boiler room or room containing central heating equipment if located below openings in another story or if less than 10 feet from other doors or windows of the same building shall be protected by a fire assembly having a three-fourths-hour fire-protection rating. Such fire assemblies shall be fixed, automatic or self-closing. For heating equipment occupancy separation see Section 302.5.

303.9 Fire Alarm Systems. An approved fire alarm system shall be installed as set forth in the Fire Code in Group A, Divisions 1, 2 and 2.1 Occupancies.

For amusement building alarm systems see Section 408.5.1.

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