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3WS-3306 1991 UNIFORM BUILDING CODE
<br />3305 (g) and all openings into the lobby wall contiguous with the mnidur %hall be
<br />protected as required by Section 3305 (h).
<br />E%CETONS: 1. In oRsee WiWmp cAs.d u a Gmup B. Dnui.n 2 Oc<u
<br />panry,.par.ion+aeJ m 4 poridN km •mat 0uw IoMy, pmswkWsl. enure
<br />soar Ilmr a pwateJ wed an &wamaric alwudla,)+rem.
<br />2.Ekvmmmrnywmdm)mee(tt"aft r i sun"ulmmemofSmllm1706.
<br />J. Whrn dd11.,W douse see Puv Wed in rco,Jarce with Sewmw 3106.
<br />Elevator lobbies shall comply with Sect'm 5106.
<br />In fully sprhtklerdoffice buildings. corridors may lead through enclo+edcleva.
<br />Ire lobbiesdell rme of Use building base access to xt least one required exit Is ith.
<br />out passing through the elevator lobby.
<br />SWrraays
<br />Set. 3306. (a) Gw.nl. Every stairway Laving two or more risers Res ing any
<br />building orponim.., nall conform to the requirements oflhis section.When
<br />aides inassembly moms have steps, they shall conform with the provisions in Sec.
<br />tiro 3313.
<br />E110EPfION: Swn or IaJdan used only o.mW rywpmmr are escmpn from
<br />the tequoemenu of d,I . t..
<br />(b) Width. The minimum stairway width shall be determined as specified in
<br />Section 3303 M. but shall DwI be Ica than as inches except as specit d herein.
<br />Stairways serving an Occupant load of 49 or Icss doll can he less than 36 iwhu in
<br />width.
<br />Nandnils may project into the required width &distance of 3'/r inches from each
<br />side of a stairway. Stringers And other pmnetions such as trim and similar decun.
<br />live features may project into the required width 11/2 inches on each side.
<br />(c) Rise and Rm. T. rise of every step in a stairway shall not be less than 4
<br />inchnargrealatltao 7 inNu. Except as permired in Subsections (d) and (O. the
<br />rvn sIW I rap be kss tun 1I cadres As measuted horizontally between the senical
<br />Planes of tMfmhamostprojectionofdjacentreads. Except as permitted in Sub.
<br />sections (d), (e) and (q, the largest (red inn within may Right of stain shall not ex.
<br />teed the smal lest by more than/s inch. The greatest ristr height within any Right of
<br />RAID, shall not (.teed the smallest by more than %inch.
<br />EXCEPTIONS: I. P,IsaD u,,,way..rrmg m tccs:pant Wad of lea than 10
<br />W ,uirray, mwsuc I,,w,j wh may he con""W wish An an
<br />maumum rase
<br />W .9-n.h minimum inn.
<br />2. Where tan baum a top On, Whoa a sloping public way, all Or d,oewa)
<br />luring an euabhahN yade.Od uryutg .. IWing, the but. or top n., maY 1c
<br />reduced Jong Ile slope 10 tear than a incise, to height with she ,anion in height
<br />of IK boat. Or rep n.r rue m exceed 3 oche,'. essay 3 fat of vanay width.
<br />(d) Winding Stairways. In Group R. Division 3 Occupancies and in private
<br />stairways in Group R. Division I Occupancies, winters may be used dthc required
<br />w'dlhuf nm is provided at a point rot more than 12 inches from U. side of the mmr-
<br />way when (he beads We narrower, but in nocue shall any width of mn be Iesslhan
<br />5 inches at any po..
<br />636
<br />1991 UNIFORM BUILDING CODE 3706
<br />(OClmslar Stahways.Coculm stairways may be use I As anexit. provided the
<br />minimum w idth of Dan is no( less (ban 10 inches and the smaller radius i, not less
<br />stun Iwice [in w iJth of rise stalrw ay. The latgol Dead width Or user height within
<br />any flight of stain shall nun exceed the smallest b) mar than 1/s inch.
<br />ID Spiral Stairways. In Group R, Division 3 Occupancies and in prnata stair.
<br />wars w dhin mdnidual units of Group R. Dn,sim I Occupancies, spiral simw a),
<br />may In installed. Such staima)s may he u>cJ for required csits wl.n the area
<br />send is Innired maid No= feet.
<br />T. tread must pruvide a clear walLmg area measuring at team 26 imhes from
<br />the outer edge of the mPixDD"9 column m the 'met edge of the handrail A run far
<br />last 71/r inches is to he pros Dlad at a point 12 inches (111, when he bead is the
<br />narrowest. The rise must to wl0aent to pro%1& 6.fml 6.Inch. headroom. T e rise
<br />shall not eacaJ 9'/c inches.
<br />(1) Iasd4lp.Every tailing shalihaveadimemimmeasuredin the direct'mof
<br />travel nor leas than the width of the stmrway. Such dmenD.. need not exceed as
<br />inches w hen the suit has a straight run. Ten, shall not be more than 12 feel %mi.
<br />tally IrMcen landings. For landings with adjoining doors, sec Section 3304 U).
<br />E%CEFFION: 5uin .ring m wtuaPiN reef are carmq !rein theta po.t.
<br />wn
<br />(Is) Basement Stairways. When a basement stairway and a stitma) to an upper
<br />sorrym person incise sameexitma into
<br />the
<br />Di,cDdui,bepug= shall
<br />br pl-1 persons tram,Idcontinuing m Imo the ba.mcnt. Dircctimal exit signs.hail
<br />be pow Wad as spenfied in Scrim 7J la.
<br />(a) Its ndrails. Staim ays.1.11 ha, c haralni is on each aide, ad every stairway
<br />equied to to man than fig inches in width shall be pmv'ded with nw Ins tsar one
<br />inern.diate handrail fast each 88 itches of required width. Intcmedian hand=[,
<br />shall to spaced approximately equally across with the entire width of the stairway.
<br />F_\l.'EITIONS: I. 5wrva)s kit roan as mrhs in w Wt6 a>wnryx en mg
<br />DO,,.
<br />arco] con.f 3cdwellinguminGmR,Usu'on Ia JOavp.n4+aaGrowp R,
<br />pprcrc eu suke may
<br />lose one AarWrail.
<br />2. Rivare..wall0irchc,adeninl.igMmayhaseh.ubaihonorc+We Wy.
<br />J. Suui .shaving k.nhan I. ran. W serving eras irdhdaal d.dimg an.,
<br />AG—P R. DaiDim t or 3. or. Group R. rhsn'on 3 congregate..'dm,,, a.nmg
<br />GI-P M Qcurync.+reed nor ha" hand,,ul,.
<br />The top of tudnils and handrail extensions shall be placed not less tun 34 in.
<br />chew or mane tun 36 inches above the r..Img of tnmts and Isdings. flandn'Is
<br />,hall to nmn.uuus the full length of the stairs ad, ucept for pnsae suuwa) s. at
<br />In. one tudail 11,311citenti m to direction of the stair Dan ant less than 12m,h,,
<br />beyond the top riser a less than 12 Inches be)ord rise bottom user. r Ws shall be
<br />returned or shall Karam a in newel posts or, safety wminals.
<br />The hadgrip poruonoffa ndnds shall nor to lessrhan 11/2 incMsormore than 2
<br />mah,s m cross sea'enal dtmensimn or the shape shall pm0ch: an equivalent gnp'
<br />pang surface. Il. hundgnp portion of hard, W+,hall have a smooth surface with no
<br />sharp contain.
<br />639
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