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1991 UNIFORM BUILDING CODE 904,2,3.7 904.4 EXCEPTIONS: 1. Sprinklers are not required for stages 1,000 904.2.7 Group I Occupancies. An automatic sprinkler system square feet(92.9 m2)or less in area and 50 feet(15 240 mm)or less in shall be installed in Group I Occupancies.In Group I,Division 1.1 height where curtains,scenery or other combustible hangings are not and Group I,Division 2 Occupancies,approved quick-response or retractable vertically.Combustible hangings shall be limited to a single residential sprinklers shall be installed throughout patient Slee main curtain,borders,legs and a single backdrop. P gh P P- 2.Under stage areas less than 4 feet(1219 mm)in clear height used mg areas. exclusively for chair or table storage and lined on the inside with EXCEPTION: In jails,prisons and reformatories,the piping sys. 5/8-inch(16 mm)Type X gypsum wallboard or an approved equal. tem may be dry,provided a manually operated valve is installed at a continuously monitored location.Opening of the valve will cause the 904.23.8 Smoke-protected assembly seating. All areas- piping system to be charged.Sprinkler heads in such systems shall be enclosed with walls and ceilings in buildings or structures con- equipped with fusible ei'emots or the system shall be designed as re- taining smoke-protected assembly seating shall be protected with quired for deluge systems in UBC Standard 9-1. an approved automatic sprinkler system. 904.2.8 Group b1 Occupancies. An automatic sprinkler system EXCEPTION:Press boxes and storage facilities less than 1,000 hall be installed in rooms cl ed as Gb1 Occupancies where square feet(92.9 m2)in area and in conjunction with outdoor seating s � Group P facilities where all means of egress in the seating area are essentially the floor area exceeds 12,000 square feet(1115 m2)on any floor or open to the outside. 24,000 square feet(2230 m'-)on all floors or in Group M Occupan- 904.2.4 Group E Occupancies. cies more than three stories in height.The area of mezzanines shall be included in determining the areas where sprinklers are 9042.4.1 General. An automatic fire sprinkler system shall be required. installed throughout all buildings containing a Group E,Division 1 Occupancy. 9042.9 Group R, Division 1 Occupancies. An automatic EXCEPTIONS: 1. When each room used for instruction has at sprinkler system shall be installed throughout every apartment ' least one exterior exit door at ground level and when rooms used for house three or more stories in height or containing 16 or more assembly purposes have at least one half of the required exits directly dwelling units,every congregate residence three or more stories in to the exterior ground level,a sprinkler system need not be provided. height or having an occupant load of 20 or more,acid every hotel 2.When area separation walls,or occupancy separations having a three or more stories in height or containing 20 or more guest fire-resistive rating of not less than two hours subdivide the building rooms.Residential or quick-response standard sprinklers shall be into separate compartments such that each compartment contains an used in the dwelling units and guest room portions of the building. aggregate floor area not greater than 20,000 square feet(1858 m2),an automatic sprinkler system need not be provided. 90.13 Sprinkler System Monitoring and Alarms. 9042.4.2 Basements. An automatic sprinkler system shall be 90.13.1 Where required. All valves controlling the water sup- installed in basements classified as Group E,Division 1 Occupan- ply for automatic sprinkler systems and water-flow switches on all cies. sprinkler systems shall be electrically monitored where the num- 904.2.4.3 Stairs. An automatic sprinkler system shall be in- ber of sprinklers are: stalled in enclosed usable space below or over a stairway in Group1. Twenty or more in Group I,Divisions 1.1 and 1.2 Occupan- E,Division 1 Occupancies.See Section 1005.3.3.6. cies. 904.2.5 Group F Occupancies. 2. One hundred or more in all other occupancies. Valve monitoring and water-flow alarm and trouble signals 904.2.5.1 Woodworking occupancies. An automatic fire sprin- shall be distinctly different and shall be automatically transmitted kler system shall be installed in Group F woodworking occupan- to an approved central station,remote station or proprietary moni- cies over 2,500 square feet(232.3 m-)in area that use equipment, toring station as defined by national standards,or,when approved machinery or appliances that generate finely divided combustible by the building official with the concurrence of the chief of the fire waste or that use finely divided combustible materials. _ department,sound an audible signal at a constantly attended loca- 904.2.6 Group H Occupancies. tion. EXCEPTION:Underground key or hub valves in roadway boxes 90.12.6.1 General. An automatic fire-extinguishing system provided by the municipality or public utility need not be monitored. shall be installed in Group H,Divisions 1,2,3 and 7 Occupancies. 9043.2 Alarms. An approved audible sprinkler flow alarm shall 904.2.6.2 Group H, Division 4 Occupancies. An automatic be provided on the exterior of the building in an approved location. fire-extinguishing system shall be installed in Group H,Division 4 An approved audible sprinkler flow alarm to alert the occupants Occupancies having a floor area of more than 3,000 square feet shall be provided in the interior of the building in a normally occu- (279 m'-). pied location.Actuation of the alarm shall be as set forth in UBC 904.2.63 Group H, Division 6 Occupancies. An automatic Standard 9-1. fire-extinguishing system shall be installed throughout buildings 904.4 Permissible Sprinkler Omissions. Subject to the ap- containing Group H,Division 6 Occupancies.The design of the proval of the building official and with the concurrence of the sprinkler system shall not be less than that required under UBC chief of the fire department,sprinklers may be omitted in rooms or Standard 9-1 for the occupancy hazard classifications as follows: areas as follows: LOCATION OCCUPANCY HAZARD 1. When sprinklers are considered undesirable because of the CLASSIFICATION nature of the contents or in rooms or areas that are of noncombus- Fabrication areas Ordinary Hazard Group 2 tible construction with wholly noncombustible contents and that Service corridors Ordinary Hazard Group 2 are not exposed by other areas. Sprinklers shall not be omitted Storage rooms without dispensing Ordinary Hazard Group 2 from any room merely because it is damp,of fire-resistive con- Storage rooms with dispensing Extra Hazard Group 2 struction or contains electrical equipment. ' Corridors Ordinary Hazard Group 21 2. Sprinklers shall not be installed when the application of wa- When the design area of the sprinkler system consists of a corridor protected ter or flame and water to the contents may constitute a serious life by one row of sprinklers,the maximum number of sprinklers that needs to Y be calculated is 13. or fire hazard,as in the manufacture or storage of quantities of alu- 1-95