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Home My WebLink About1991/01/14 Board of Appeals & Advisors Agenda Packet (3) Item #3C (1 of 26) Defmition of EXIT .c Exit is a continuoas and unobstructed means of egress to a public way and shaIl include intervening aisles, doors, doorways, corridors, exterior exit balco- nies, ramps, stairways, smokeproof enclosures, horizontal exits, exit passage- ways, exit courts and yards. Doors/Doorways - Corridors Exterior Exit Balconies Ramps F Stairways Smokeproof Enclosures Horizontal Exits Exit Passageways Exit Courts Yards ~ Public Way ( Section 3301 (b) 1 Item .3C (2 of 26) BASIC CONCEPTS OF EXITING ,( · Exits must be provided for all building occupants · Occupants must have control of all elements of the exiting system · Once size and number have been established, they cannot be reduced ( · Once level or degree of fire safety has been established, they cannot be reduced EXITING Chapter 33 ( 2 - --- -----~ item 1','JC (3 of 26) TABLE NO. 33-A-MINIMUM EGRESS AND ACCESS REQUIREMENTS - - .~ MINIMUM OF ACCESS BY TWO EXITS MEANS OF A OTHER THAN RAMP OR AN ELEVATORS ARE ELEVATOR MUST r REQUIRED OCCU- BE PROVIDED WHERE PANT FOR THE NUMBER OF LOAD PHYSICALLY OCCUPANTS IS FACTOR2 HANDICAPPED USE1 AT LEAST (Sq.FI.) AS INDICATEDJ I. Aircraft Hangars (no repain 10 500 Yes 2. Auction Rooms 30 7 Yes I ! 3. Assembly Areas. Concen- trated Use (without fixed seats) 50 7 YcsJ .~ Auditoriums Churches and Chapels Dance Floors Lobby Accessory to Assembly Occupancy Lodge Rooms Reviewing Stands Stadiums \\'aiting Area 50 3 YesJ~ 4. Assembly Areas. less-con- centrated Use 50 15 YesJ ~ 6 Conference Rooms Dining Rooms Drinking Establishment~ Exhibit Rooms ( Gymnasiums Lounges Stages 5. Bowling Alley (assume no I occupant load for bowling lanes) 50 ,. 1'('5 6. Children's Homes and I Homes for the Aged 6 80 Yesì 7. Classrooms 50 èO I Yes~ I 8. Courrrooms 50 ':0 'Yes 9. Dormitories 10 50 Yö7 10. Dwellings 10 300 No 11. Exercising Rooms 50 50 Yes 12. Garage, Parking 30 èOO Yes" 13. Hospitals and Sanitariums- Nursing Homes 6 SO Yes 10 èOO YCSIi) , 14. Hotels Jnd ApJrfmcnts l~: Kitchen~ommerClJJ 30 èOO I\';l) 16. Library RCJdin~ R0nm 50 I 50 I ì'LS~ I I 17. Locker Rooms :-;0 50 ì'l''\ ! IS. ~1,,11s hec Chapler 5(,) - I - I - i ( 5 item ;íjl. \4 ot ¿b) - -- ..' .~'. --- --- r 19. Manufacturing Areas 30 èOO Y~s7 20. Mechanical Equipment Room 30 300 1':11 21. Nurseries for Children (Day care) 7 35 Yes 22. Offices 30 [00 J Yes' 23. School Shops and Vocational I Rooms 50 50 I Yes 24. Skating Rinks 50 50 on Yes-l I the skating area; 15 on the deck 25. Storage and Stock Rooms 30 I 300 I '-:0 26. Stores-Retail Sales Rooms , , , Basement " .30 Yes I Ground Floor 50 30 Yes I Upper Floors 10 60 Yes I 27. Swimming Pools 50 50 for Yes' [ , , the pool area; I 150nrhe I ( deck 18. \\'arehouses 30 <00 I '-: I .0 29. All others 50 100 I I For additional provì\ion\ on number of exit..... from Group H Jnd I Occup¡mcie" <lnd from rooms cont<lining fuel-fired equipmenl or cellulo"e nitrate, "Ice SecIHIO.... JJ2(J. 3321 and 3322. rcsrcctlvcly. 1This tí.Jble shall not be used to determine working ....pJce re(uiremenh per per...on. 'Elevators sh<J1I not be construed as providing a requlrcu exiL 4Access to seconJäry areas on balconies or mezzanines may be by ....!alr.... only. except v.hcn , such secondary <lrcas contain the only available toilet facilities. ~Rcvicwing sl<lnds, grandständs, bleachers, and folding and lelescopic bleachers need nol compl y. "'Access requirements for conference rooms, dining rooms, lounges and exhibit Woms that arc part of an office use shall be (he same as rc(uired for the office u....c. 7Accc.'is 10 floors other than (ha( closest to grade may be by ~tair.'i only. c.'(cept when the (>nly available toilet facilities are on orher levels. ~When [he floor closest to the grade offers the same rrogram'\ and <.iC!IVI!le... available on olher floors, :Jccess to the other floors may be by \!.:J.Ìrs only, cxcept v.hen the only (J\'aiiJble toj~t facilitics are on other leveLs. '¡Access fo flex)rs uther th:..tn th:J[ clusest to grade <.mu 10 garJg~"" u...eJ In conncction \~ Ith apartment houses may be by stairs only. IIISee Sectron 12 J 4 for access (0 buildings and LlCilillÖ In hOlèl~ Jnd ;Jr:..trtmcn!s. .~. II See Section 3303 for basement exit requiremcnts. ,; 120ccupanlload bascd upon five persons for cach alley. Including I) (ec( of rUO\~ay ( 6 -----------~"'- ~-- - -._~---- Item "3C (S of 26) POSTING OF ROOM CAPACITY r MAXIMUM OCCUPANT lOAD 108 STANDING 50 DINING r1 - CLASSROOM, ASSEMBLY AREA OR SIMILAR USE ( <- SIGN REQUIRED FOR ANY ROOM HA VING AN OCCUPANT LOAD OF 50 OR MORE, WITHOUT FIXED SEATS USC Section 3302(c) ( UFC Section 25.114(a) 7 Item ýJC (6 of 26) NUMBER OF EXITS r A MINIMUM OF: ONE EXIT FROM ANY USABLE PORTION OF A BUILDING OR ROOM TWO EXITS WHERE REQUIRED BY TABLE NO. 33-A TWO EXITS FROM SECOND STORY WHEN OCCUPANT LOAD > 10 (except individual dwelling units) TWO EXITS FROM THIRD STORY TWO EXITS FROM BASEMENT (except individual r dwelling units, service areas, or storage and laundry areas <300 sq. ft.) THREE EXITS FROM EVERY STORY OR PORTION WITH AN OCCUPANT LOAD OF 501 TO 1000 FOUR EXITS FROM EVERY STORY OR PORTION WITH AN OCCUPANT LOAD OF 1001 OR MORE I Section 3303(a) 8 Item #3C (7 of 26) r This exceptidr"f f:je rril its two or-more-i::fwelling units in a basement to have access to only one exit when the occupant load does not exceed 10. One exit required -----., I i ·11 ¡II, , Dwelling Dwelling Dwelling f - Dwelling / unit . unit. unit unit 10 or less 10 or less occupants occupants ~ ~ exit , exit exit - exit "'- - - . . . , - ¡Ii \.J: "-C L.< . ¡- - i I £ exit eXit exit eXit ," Dwelling Dwelling Dwelling Dwel!lng unit unit unit unit Basement or second story The exception also permits occupants of dwelling units on the second story, and in the basement, to have access to only one exit even though the total Occupant load of the floor exceeds 10. ( NUMBER OF EXITS Section 3303ia), Exception 1 Item#3C (8 of 26) r One exit required / for third story maximum of 500 ,/ square feet and roof not Occupied.' Individual dwelling unit £ . Can use a combination of usable third floor and occupied roof as long as Ihe total area does not exceed 500 square feel (R-3 Occupancy only). EXITS REQUIRED ( Section 3303 (a), Exception 3 10 ~._--~--- Item #3C (9 of 26) r This provision will apply to the second floor level within an individual dwelling unit no matter what story of the building it is on, provided that only one exit is required by Table No. 33-A. " ì One Third floor I Two exits I eXit < 500 square feet required Individual , from story. dwelling unit I One Second floor / I exit I , , I I / I One I ~ I First floor I " exit , I /ì , One i t t £ exit Second floor Individual dwelling unit I i One I T First floor exit-- Exception 3 is similar to Exception 2 but will apply to the third floor within an individual dwelling unit when it is limited to 500 square feet or less. NUMBER OF EXITS { Section 3303 (a), Exceptions 2 and 3 11 Item fJC (10 of 26) r Given: 400 occupants per floor Exits into first floor .------- Exit enclosures --------- , i L '1 2 exits " , I -- -~- 2 exits ;J required " I, I required I I II 2 exits , -- ----.:..0.-_ 11 required ' ,~ , , . , , 600 total occupants " ., Ii , 2 exits 3 exits required -- -,-- - ¡i required II - - -- il - -- Enclosure eXit r Case 1 Case 2 The number of exits should be determined based upon the number of occupants that are exiting from a particular floor. The number of exit enclosures need not be increased due to the number of occupants within the enclosure. EXITS REQUIRED ( Section 3303 (a) 12 Item #3C (11 of ,26) ROOM OR AREA , r DIAGONAL ~ 1/2 DIAGÒNAL ~ - - , _O¥ -- --- -- -- -- --- - - -- - --- -- - - -- , - --- ...- ARRANGEMENT OF EXiTS Sec. 3303(c) I 15 Item ë3C (12 of 26) - ,.-------. r Given: Three or more exits required ~ Overall diagonal ~ ...... One-half of overall diagonal I~ - I r , , ~ '- The location of two of the exits will now be controlled by one-half the overall diagonal distance. The additional exits will only be regulated by the "reasonable" distance, which will be determined by the building official on a case-by-case basis. ARRANGEMENT OF EXITS Section 3303 (c) 16 Item #3C (13 of 26) r Open stairway I , ~. Open parking garage \ \ II II ~L I ~ ~ \ \ I I , \ \ \ \ 250 feet maximum travel distance r The travel distance in an open parking garage only needs to be measured to the exit stairway. This will also apply when the stairway is unenclosed per Section 3309 (a), Exception 3 or when enclosed with glazing per Section 3309 (b). ! DISTANCE TO EXITS Section 3303 (d) 23 H_.___.'_.__ item #3C (14 of 26 EXITS THROUGH r ADJOINING ROOMS exit corridor, exit enclosure or egress from the building t -+- .... ADJOINING OR INTERVENING ROOM .... , r exit corridor, exit enclosure or egress from the building t more than ADJOINING OR .... one exit INTERVENING ROOM required from room .... -+- ~ EXITS REQUIRED Section 3303(e) I 24 .--- - --- ~- Item ffJC (IS of 26) EXITS THROUGH r ADJOINING ROOMS exit corridor, exit enclosure or egress from the building t 4- exiting not permitted KITCHEN, STORE ROOM, REST ROOM, CLOSET OR SIMILAR SPACE . r exit corridor, exit enclosure or egress from the building t -. 4- ADJOINING OR INTERVENING ROOM FOYER, LOBBY .- OR RECEPTION 4- RX:t.1 (constructed as required for corridors) t EXITS REQUIRED Section 3303(e) { 25 Item g3C (16 of 26) EXITS THROUGH ADJOINING ROOMS r exit corridor, exit enclosure t or egress from thE' building I ~..J ~ ~ Occupant Load of 10 or less ADJOINING OR t INTERVENING ROOM t t .. , -.. t ~ { OCCUPANT LOAD OF } -.. EACH ADJACENT ROOM ~ IS 10 OR LESS -.. ~ .. ADJOINING OR INTERVENING ROOM .. exit corridor, exit enclosure .. or egress from the building EXITS REQUIRED Section 3303( e), Excepti 0 n 2 ( 26 Item #3C(17 of 26) r 6'8" MINIMUM ~ HANDRAIL Sec. 3306() -../ 1 MINIMUM RUN 4" MIN. RISE 8" MAXIMUM RISE OCCUPANT LOAD LESS THAN 10 (Private Stairway) 6'8" MINIMUM r MAXMIMUM TREAD RUN HEADROCM VARIATION OF 3/8 INCH MAXIMUM RISER VARIATION HANDRAIL OF 3/8" Sec. 3306() M'",M~~ --1 '" .1 '1 Of 4" MIN. RISE .l MINIMUM RUN 7" MAXIMUM RISE I OCCUPANT LOAD OF 10 OR MORE STAIRWAYS I Sec. 3306 59 Item #3C (18 of 26) -.'-," r Sloping . Riser height grade / . Þ / 7 inches maximum - , (8 inches maximum ~. , / forR-3) . Riser may be less than 4 inches. ~ Bottom - - ,.. " Sloping grade /- ,. . Slope not to exceed - 3 Inches in 3 feet of stairway width. Top RISE AND RUN f Section 3306 (c), exception 2 60 Item #3C (19 of 26) HORIZONTAL EXIT is an exit from one building into another building on approximately the same level, or through or around a wall constructed as required r for a two-hour occupancy separation and which completely divides a floor into two or more separate areas so as to establish an area of refuge affording safety from fIre or smoke coming from the area from which escape is made. A HORIZONTAL EXIT MAY BE CONSIDERED AS A REQUIRED EXIT WHEN CONFORMING TO THE PROVISIONS OF CHAPTER 33 MINIMUM 1 1/2 HOUR FIRE ASSEM8L Y . TWO-HOUR FIRE- AREA B f RESISTIVE WALL þ. AREA A A HORIZONTAL EXIT SHALL NOT SERVE AS THE ONL Y EXIT FROM A PORTION OF A BUILDING· WHEN TVJO OR MORE EXITS ARE REQUIRED, NOT MORE TAN ONE HALF OF THE TOTAL NUMBER OF EXITS OR TOTAL EXIT WIDTH MAYBE HORIZONTAL EXITS HORIZONTAL EXITS ( Section 3308 3 Item #3C (20 of 26) i,~" .,.... ,.~ . _~.........",.:-.' '. _' 'y'" .<_;. _' "._. .." ;.;.......,. .',.' '., -. -. ~ ., -". - .. DOOR SWING r AREA A AREA B TWO-HOUR FIRE- RESISTIVE WALL f Note: If occupant load >50, two doors must swing in direction of exit travel. AREA E AREA C THREE EXITS TWO EXITS REQUIRED REQUIRED ONE EXIT REQUIRED ~ TWO-HOUR FIRE- RESISTIVE WALL HORIZONTAL EXITS Section 3308 I 4 Item *3C (21 of 26; - '-,,* . r DISCft~RG~rÄI:tEAS Horizontal exit capacity is based on net clear floor area. General: 3 sq. ft.locc. 1-1 ambulatory: 15 sq. ft.locc. 1-1 nonambulatory: 30 sq. ft.locc. A B NOTE: Exits for "A" adequate to /:. meet the provisions of Chapter 33 /:. but need not include added capacity '/: imposed by occupants entering through horizontal exit from "B: -,/ Exit Horizontal exit Exit ~ - £ Unlike the provisions of exiting through an adjoining room the occupant load which exits through a horizontal exit need not be included when calculating the exit requirements for the room which is receiving the occupants. This benefit is based on the fact that by exiting through the two-hour wall and into a compartment away from the fire or other hazard, occupants would either be able to remain in that area until the hazard has been controlled, or until the orderly use of the remaining exits is possible. HORIZONTAL EXITS ( Section 3308 5 ,-.--- item #3C (22 of 26 EVERY INTERIOR STAIRWAY, RAMP OR ESCALATOR SHALL BE "ENCLOSED AS SPECIFIED IN SECTION 3309. r 9. r :i,' < , '"..;. " ~ «';.' "". , . EXCEPT: =""- = , s r =ss = . In other than Group H and I Occupancies, an enclosure need not provided for a stairway, ramp or escalator servIng only one adjacent floor and not connected with corridors or stairways serving other floors. . Stairs in R-3 Occupancies and stairs within individual dwelling units of R-1 Occupancies need not be enclosed. . Stairs in open parking garages ( STAIRWAYS ENCLOSURES Section 3309(a) 6 --- Item #3C (23 of 26 -MECHANLCAL:VENTI.LA TIOf't f IN A SMOKEPROOF ENCLOSURE WITH MECHANICAL VENTILATION, THE FOllOWING REQUIREMENTS MUST BE ADDRESSED: · Doors · Vestibule size · Vestibule ventilation · Smoke trap · Stair shaft air movement system · Operation of ventilating equipment · Standby power · Acceptance testing · Emergency lighting 44~ MIN. 6" MAX. CEILING EXHAUST z SMOKE -1 DUCT £ " TRAP '" ZONE N ~USTNOTBE BELOW SMOKETRAP 6" MAX. SUPPLY DUCT CROSS SECTION OF VESTIBULE SMOKEPROOFENCLOSURE Section 3310(9) ( 17 Item #3C (24 of 26) EXIT COURT is a yard or court providing access to a public way for one or more required exits. r r''''~ Una Exit Court Exit Court 1: I :J Exit Court I ~j I £ EXIT PASSAGEWAY EXIT COURT EXIT PASSAGEWAY EXIT COURTS Section 3311 ( 18 ---- Item #3C (25 of 26) A1SLI;:ScS:HAll 'fERMJi\JAT.EJN k . . ""~' " .. .-. .. CROSS AISLE . £ · FOYER · EXIT EXIT -LOBBY EXIT EJEJEJEJEJEJEJEJ EJEJEJEJEJEJEJEJ DO DO DO 00---·· § DO DO DO EJ EJEJEJEJEJEJEJEJ EJEJEJEJEJEJEJEJ OEJEJEJEJEJEJEJ EJEJEJEJEJEJEJEJ CROSS AISLE r EJEJEJEJEJ EJ EJEJ DO EJEJooD EJEJEJEJEJ EJEJEJEJEJ EJEJEJEJEJ EJEJEJEJEJ EJEJEJEJEJ EJEJEJEJEJ EJEJEJEJEJ EJEJEJEJEJ EJEJEJEJEJ _ IN GROUPS A AND E OCCUPANCIES, AISLES SHALL NOT HAVE A DEAD END GREATER THAN 20 FEET IN LENGTH CROSS AISLES Section 3315(e) 31 Item #3C (26 of 2E BASIC WIDTH OF AISLES IN AREAS HAVING FIXED SEATS r FOYER EXIT EXIT EXIT ?X~ /, , ~ , .' a: w > 0 u. 0 I- ..J W ::- AISLE WIDTH AISLE WIDTH .q: a: 36" BASIC 42" BASIC I- 0 +30" TRAVEL +30" TRAVEL 0 w .... ..J 0 66" TOTAL 72" TOTAL rn 0 ;¡: N w 100/5 = 20 ..J rn 66" 72" 20 X 1.5" = 30" 72" .q: rn rn 0 a: u 0 ( I- ..J W ,:; a: I- 0 0 .... CROSS AISLE I ( EXIT 8'-9" EXIT ) 72" + .5(66") = 105" = 8'-9" L J 1 OPTIONAL METHOD OF CALCULATING CROSS AISLE STAGE [72" + .5(66) + .5(66) + .5(72)]/2 = [174"]/2 = 87" OR 7' 3" TOTAL AISLE WIDTH IS DIVIDED BY 2 SINCE EXITS ARE PROVIDED AT EACH END OF CROSS AISLE AND WE ASSUME ONE·HALF OF THE OCCUPANTS GO EACH WAY. AISLES ( Section 3315 32 ----- ~-