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CHAPTER 4 EGRESS - ecodes.biz

CHAPTER 4 EGRESSSECTION means of EGRESS for new bleachers, foldingand telescopic seating, and grandstands shall comply with Exit within tiered seating shall be consid-ered exit access. Exit access includes aisles, cross-aisles,sloped or level walking surfaces, vomitories, tunnels, stairs andramps connecting the tiered seating structure to other portionsof a building, structure or 403 OCCUPANT Occupant bench seating is used, the num-ber of persons shall be based on one person for each 18 inches(457 mm) of length of the bench. Where individual seats areprovided, the occupant load shall be based on one person perseat. The occupant load of reviewing stands and press boxesshall be based on 5 square feet ( m2) per person for stand-ing space and 7 square feet ( m2) per person for movablechair seating space.

CHAPTER 4 EGRESS SECTION 401 GENERAL 401.1General.Themeansofegressfornewbleachers,folding and telescopic seating, and grandstands shall comply with this

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Transcription of CHAPTER 4 EGRESS - ecodes.biz

1 CHAPTER 4 EGRESSSECTION means of EGRESS for new bleachers, foldingand telescopic seating, and grandstands shall comply with Exit within tiered seating shall be consid-ered exit access. Exit access includes aisles, cross-aisles,sloped or level walking surfaces, vomitories, tunnels, stairs andramps connecting the tiered seating structure to other portionsof a building, structure or 403 OCCUPANT Occupant bench seating is used, the num-ber of persons shall be based on one person for each 18 inches(457 mm) of length of the bench. Where individual seats areprovided, the occupant load shall be based on one person perseat. The occupant load of reviewing stands and press boxesshall be based on 5 square feet ( m2) per person for stand-ing space and 7 square feet ( m2) per person for movablechair seating space.

2 The occupant load for security, audio andcamera platforms shall be based on the actual number of 404 GENERAL MEANS OF Minimum number of minimum number ofexits shall be provided from the seating area based on the fol-lowing occupant loads and in accordance with the calculatedwidth requirement for EGRESS capacity in Section LOADREQUIRED MEANS OF EGRESS0-2501251-7502751- 2,5003 Over 2, Room or space means of or spaces inwhich tiered seating is located shall be provided with therequired means of EGRESS in accordance with the building Exterior exterior installations wherethe means of EGRESS converges, a minimum of two EGRESS pathsshall be provided, sized to accommodate the occupant loadserved. Where the exit discharge does not lead directly to astreet or public way, it shall lead to an area of refuge sized tocontain the full capacity and located a minimum of 50 feet (15240 mm) from the Travel installations located inside a build-ing, the travel distance from each seat to an exit shall complywith the building code.

3 For exterior installations, the travel dis-tance from each seat to the perimeter of the seating structureshall not exceed 400 feet (122 m). Where aisles are providedfor seating, the distance shall be measured along the aisles andaisle accessway without travel over or on the Required clear width of aisles and othermeans of EGRESS for indoor smoke-protected assembly seatingshall not be less than the occupant load served by the EGRESS ele-ments multiplied by the appropriate factor in Table (1).The clear width of aisles and other means of EGRESS for indoorassembly seating that is not smoke protected shall not be lessthan the occupant load served by the EGRESS elements multi-plied by the appropriate factor in Table (2). The clearwidth of aisles and other means of EGRESS for outdoorsmoke-protected assembly seating shall not be less than theoccupant load served by the EGRESS elements multiplied by theappropriate factor in Table (3).

4 The total number of seatsspecified shall be those within the space exposed to the shall also comply with Section 405. The clear widthshall be measured to walls, edges of seating and tread edgesexcept for permitted projections. There shall be no obstructionsin the required width of aisles except for handrails as providedin Section minimum width of aisles shall be in accor-dance with Section , but not less than that required by thissection. An aisle is not required in seating facilities where all ofthe following conditions Seats are without The rise from row to row does not exceed 6 inches (152mm) per The row spacing does not exceed 28 inches (711 mm)unless the seatboards and footboards are at the same The number of rows does not exceed 16 rows in The first seating board is not more than 12 inches (305mm) above the ground or floor below or a cross Seatboards have a continuous flat Seatboards provide a walking surface with a minimumwidth of 11 inches (279 mm).

5 8. EGRESS from seating is not restricted by rails, guards orother STANDARD ON BLEACHERS, FOLDING AND telescopic SEATING, AND GRANDSTANDS78 ICC STANDARD ON BLEACHERS, FOLDING AND telescopic SEATING, AND GRANDSTANDSEGRESSTABLE (1)WIDTH OF AISLES AND MEANS OF EGRESS FOR INDOOR SMOKE-PROTECTED ASSEMBLY SEATINGTOTAL NUMBER OF SEATS IN THESMOKE-PROTECTED ASSEMBLYOCCUPANCYINCHES OF CLEAR WIDTH PER SEAT SERVEDS tairs and aisle steps withhandrails within 30 inchesStairs and aisle steps withouthandrails within 30 inchesPassageways, doorwaysand ramps not steeperthan in 1:10 slopeRamps steeperthan in 1:10 slopeEqual to or less than 5, , , , to or greater than 25, SI: 1 inch = : Interpolation is permitted between specific values (2)WIDTH OF AISLES AND MEANS OF EGRESSFOR INDOOR NONSMOKE-PROTECTED ASSEMBLY SEATINGTOTAL NUMBER OF SEATS INTHE NONSMOKE-PROTECTEDASSEMBLY OCCUPANCYINCHES OF CLEAR WIDTH PER SEAT SERVEDS tairs andaislestepswithhandrailswithin 30inchesStairs andaisle stepswithouthandrailswithin 30inchesPassageways, doorways and ramps not steeper than in 1:10slopeRamps steeperthan in 1:10 slopeAll seating SI: 1 inch = : The values in the table are applicable to steps with riser heights of 7 inches and below.

6 Add inch of additional stair width for each occupant for eachadditional inch of riser height above 7 (3)WIDTH OF AISLES AND MEANS OF EGRESS FOR OUTDOOR SMOKE-PROTECTED ASSEMBLY SEATINGTOTAL NUMBER OF SEATS INTHE SMOKE-PROTECTEDASSEMBLY OCCUPANCYINCHES OF CLEAR WIDTH PER SEAT SERVEDS tairs andaislesteps withhandrailswithin 30inchesStairs andaisle stepswithouthandrailswithin 30inchesPassageways, doorways and ramps not steeper than in 1:10slopeRamps steeperthan in 1:10 slopeEqual to or less than 15, , to or greater than25, SI: 1 inch = : Interpolation is permitted between specific values Minimum aisle minimum clear width ofaisles shall be as Forty-eight inches (1219 mm) for aisle stairs havingseating on each :Thirty-six inches (914 mm) where theaisle serves less than 50 Thirty-six inches (914 mm) for aisle stairs having seatingon only one Twenty-three inches (584 mm) between an aisle stairhandrail or guard and seating where the aisle has amid-aisle Forty-two inches (1067 mm) for level or ramped aisleshaving seating on both :1.

7 Thirty-six inches (914 mm) where the aisle servesless than 50 Thirty inches (762 mm) where the aisle does notserve more than 14 Thirty-six inches (914 mm) for level or ramped aisleshaving seating on only one :1. Thirty inches (762 mm) where the aisle does notserve more than 14 Twenty-three inches (584 mm) between an aislestair handrail and seating where an aisle does notserve more than five rows on one Aisle aisle width shall provide sufficientegress capacity for the number of persons accommodated bythe catchment area served by the aisle in accordance with Sec-tion The catchment area served by an aisle is that portionof the total space that is served by that section of the aisle. Inestablishing catchment areas, the assumption shall be madethat there is a balanced use of all means of EGRESS , with the num-ber of persons in proportion to EGRESS Converging aisles converge to form a sin-gle path of EGRESS travel, the required EGRESS capacity of thatpath shall not be less than the combined required capacity ofthe converging Uniform portions of aisles, where egressis possible in either of two directions, shall be uniform inrequired Dead length of a dead-end aisle shall notexceed 16 rows in nonsmoke-protected assembly seating and21 rows in smoke-protected assembly.

8 Dead-end aisles terminating at a cross aisle orvomitory providing access to an exit at only one end andcomplying with any one of the following shall be In nonsmoke-protected assembly seating,dead-end aisles exceeding 16 rows are permittedwhere seats beyond the 16th row are no more than24 seats from another aisle, measured along a rowof seats having an aisle accessway with a mini-mum clear width of 12 inches (305 mm) plus ( mm) for each additional seat beyondseven in the For smoke-protected seating, dead-end aislesexceeding 21 rows are permitted where seatsbeyond the 21st row are no more than 40 seatsfrom another aisle, measured along a row of seatshaving an aisle accessway with a minimum clearwidth of 12 inches (305 mm) plus inch ( ) for each additional seat beyond seven in Dead-end cross cross aisles shall notexceed 20 feet (6096 mm).

9 SECTION 406 AISLE Treads and stairs shall consist of a series oftreads and risers that extend across the full width of the stairs shall be constructed in accordance with the require-ments of this Tread depth shall be a minimum of 11inches (279 mm). The tolerance between adjacent treads shallnot exceed inch (408 mm). Tread constructed of more thantwo elements shall not have a gap of more than inch ( ) between adjacent tread surfaces. Treads constructed ofgrating shall not permit a sphere of inch ( mm) in diam-eter to pass Riser height shall be not less than 4 inches(102 mm) nor more than 8 inches (203 mm).Exception:Riser height not exceeding 9 inches (229 mm)shall be permitted where necessitated by the slope of theadjacent seating areas to maintain Riser shall be of solid :1.

10 Openings in risers are permitted provided the openingdoes not exceed inches ( mm) in height Solid risers are not required in telescopic and foldingseating where necessary to maintain opening and closingoperational Dimensional treads and risers shall beof uniform size and shape. The tolerance between the largestand smallest riser or between the largest and smallest treadshall not exceed inch ( mm) in any flight of :Treads and risers in transition areas and para-bolic seating configurations in accordance with Tread and riser nonuniformity risers located in transition areas between adjacent tieredseating elements, parabolic seating configurations or onto oroff of tiered seating are not required to be of uniform depth orheight where a mid-aisle handrail is provided.


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