Western Steel Erection plan review notes

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1997 UNIFORM BUILDING CODE 301 302.4 Chapter 3 USE OR OCCUPANCY SECTION 301 -OCCUPANCY CLASSIFIED An occupancy shall not be located above the story or height set forth in Table 5-13, except as provided in Section 506. When a Every building, whether existing or hereafter erected, shall be mixed occupancy building contains a Group H,Division 6 Occu- classified by the building official according to its use or the char- pancy,the portion containin&-tGroup H,Division 6 Occupancy br acter of its occupancy,as set forth in Table 3-A, as a building of shall not exceed three stories 55 feet(16 764 mm)in height. one of the following occupancy groups: Group A-Assembly (see Section 303.1.1) 302.2 Forms of Occupancy Separations. Occupancy separa- tions shall be vertical or horiz ntal or both or,when necessary,of Group B-Business(see Section 304.1) such other form as may be required to afford a complete separa- Group E-Educational (see Section 305.1) tion between the various occupancy divisions in the building. Group F-Factory and Industrial(see Section 306.1) Where the occupancy separation is horizontal,structural mem- bers supporting the separation shall be protected by equivalent Group H-Hazardous(see Section 307.1) fire-resistive construction. Group I-Institutional(see Section 308.1) 302.3 Types of Occupancy Separations. Occupancy separa- Group M-Mercantile (see Section 309.1) tions shall be classed as "four-hour fire-resistive," "three-hour fire-resistive," "two-hour fire-resistive" and "one-hour fire- Group R-Residential (see Section 310.1) resistive." Group Storage(see Section 311.1) 1. A four-hour fire-resistive occupancy separation shall have Group U-Utility(see Section 312.1) no openings therein and shall not be of less than four-hour fire- resistive construction. Any occupancy not mentioned specifically or about which 2. A three-hour fire-resistive occupancy separation shall not there is any question shall be classified by the building official be of less than three-hour fire-resistive construction.All openings and included in the group that its use most nearly resembles, in walls forming such separation shall be protected by a fire based on the existing or proposed fire and life hazard. assembly having a three-hour fire-protection rating. The total For changes in use,see Section 3405. width of all openings in any three-hour fire-resistive occupancy separation wall in any one story shall not exceed 25 percent of the length of the wall in that story and no sin le opening shall have an SECTION 302- MIXED USE OR OCCUPANCY area greater than 120 square feet(11 m2). 302.1 General. When a building is used for more than one occu- All openings in floors forming a three-hour fire-resistive occu- pancy purpose, each part of the building comprising a distinct pancy separation shall be protected by shaft, stairway, ramp or "occupancy," as described in Section 301, shall be separated escalator enclosures extending above and below such openings. from any other occupancy as specified in Section 302.4. The walls of such enclosures shall not be of less than two-hour EXCEPTIONS:1.When an approved spray booth constructed in fire-resistive construction and all openings therein shall be pro- accordance with the Fire Code is installed,such booth need not be sep- tected by a fire assembly having a one- and one-half-hour fire- arated from Group B,F,H,M or S Occupancies. protection rating. 2.The following occupancies need not be separated from the uses EXCEPTION:When the walls of such enclosure extending below t to which they are accessory: the three-hour fire-resistive occupancy separation to the foundation 2.1 Assembly rooms having a floor area of not over 750 square are provided with a fire-resistive rating of not less than three hours with feet(69.7 m'-). openings therein protected as required for walls forming three-hour occupancy separations,the enclosure walls extending above such floor 2.2 Administrative and clerical offices and similar rooms that used as the three-hour fire-resistive occupancy separation may have a do not exceed 25 percent of the floor area of the major use one-hour fire-resistive rating,provided: when not related to Group H,Division 2 and Group H,Divi- sion 3 Occupancies. 1. The occupancy above is not required to be of Type I or If fire- 2.3 Gift shops, administrative offices and similar rooms in resistive construction,and Group R,Division 1 Occupancies not exceeding 10 percent 2• The enclosure walls do not enclose an exit stairway,a ramp or an of the floor area of the major use. escalator required to have enclosure walls of not less than two-hour 2.4 The kitchen serving the dining area of which it is a part. fire-resistive construction. 2.5 Customer waiting rooms not exceeding 450 square feet 3. A two-hour fire-resistive occupancy separation shall not be (41.8 m'-)when not related to Group H Occupancies and of less than two-hour fire-resistive construction. All openings in when such waiting rooms have an exit directly to the Such separation shall be protected by a fire assembly having a exterior. one-and one-half-hour fire-protection rating. 3.An occupancy separation need not be provided between a Group 4. A one-hour fire-resistive occupancy separation shall not be R,Division 3 Occupancy and a carport having no enclosed uses above, of less than one-hour fire-resistive construction. All openings in provided the carport is entirely open on two or more sides. such separation shall be protected by a fire assembly having a 4.A Group S,Division 3 Occupancy used exclusively for the park- one-hour fire-protection rating. ing or storage of private or pleasure-type motor vehicles need not be separated from a Group S,Division 4 Occupancy open parking garage 302.4 Fire Ratings for Occupancy Separations. Occupancy as defined in Section 311.1. separations shall be provided between the various groups and di- When a building houses more than one occup: ncy, each por- visions of occupancies as set forth in Table 3-13.For required sep- tion of the building shall conform to the requirements for the oc- aration of specific uses in Group I, Division 1 hospitals and cupancy housed therein. nursing homes,see Table 3-C. See also Section 504.6.1. 1-13