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�� , �� . <br /> ��-. �� � <br /> MEANSOFEGRESS 55 �� <br /> o�; L � ��� <br /> .� �� �l <br /> .-� _ . . .�G, vk�-_�--� <br /> � �enclosed space sh�dl noi be dircetly fmm u•ithin the stair � mum[readdepthof10.5inches(267mm).Therisetothe <br /> �, enclosure. . . . -� next alternating trcad sudace should not be morc than 8 <br /> ---... — inches(203 mm). . _ ..._.__.___ .__._�l <br /> Exception: Spaccs undcr stairways scrving and con- .'��� Handrails. Stainvays shall havc handmils on cach <br /> iaincd within a sinElc rcsidcntial dwclling unil in Group � <br /> R? ur N-3 sh:�ll bc perniiacd «� lx� pmtcctcd on Uic .� sidc and shall comply wiih Section �012•Whcrc glass is uscd <br /> ei(�fosrd sidc u�iih 0.3-inch(.12.7 mm)EYR.���n bO�.— to pmvidc theTianaraTlhclian r.0 s a :�so o�FP13'u'� <br /> �S�ction 2407. <br /> There s:rill bc nn cnclosed usable space under ez�crior F,xce dons: <br /> �� cxit slairaays unlcss �hc space is completcly encloscd in I P <br /> / I-hour firc-resiz�ancc-rated cunsin�ction. Thc open space / 1, Aisle stain cotnplying with Seclion 1025 pmvidcd <br /> undcrcxicrior st�+incays shall not bc uscd for any purposc. !, with a ccntcr handrail nced not havc additional hand- <br /> t� . 1M19.6 Verticsl risc.r1 Ilighl al'slairs shall not hacc n vcrli�_nI <br /> ruils. <br /> `r ��1 risc grcatcr Ih:m I2 fcci (3(SR mml bctwccn Iloor Icvck ��r.� 2. Stainvays wi�hin d�vclling units,spiral s�airways and <br /> t��landings. -....__..__ _ . . . aislc smin scrving seating nnly on onc sidc arc per- <br /> �� �� tni�ted lo havc a handrail on onc sidc only. <br /> �r .--F.x`ception: Aislcst:iirscomplyingwithScction1025. �tiosandwalkwatithathavcasinglcchangc <br /> 3. Decks,p, y� <br /> 11N19.7 Cur�ivl st�iin+'m's. Cun�cd smirways with windcr in cic��ation whcre thc Innding dcpth on cach sidc of <br /> vcads shall ha��c ircads and riscrs in accorJancc with Scc��nn �hc changc of clevation is grcalcr lhan what is <br /> 1009.3:md�hc smallcst radius shall nol bc Icss th�m twicc thc rcquired for a landing do noi requirc handrails. <br /> rcyuired�aid�h of thc sinirway. 4. In Gmup R-3 occupancics,a changc in cicvation con- <br /> Rxceptinn:Tlm radiuz rcs�ric�ion shall not appl)'lo curved s�stlng o(a single riscr al :m entrance or cgrcss dcx�r <br /> stairn�ays forcxcup:mcics in Group R-3 and wilhin individ- docs not rcquirc handmils. <br /> ual dwelling units in occupancies in Gmup R-2. 5. Changes in mom elevations of only one riser within <br /> ~ 11N19.8 Spir+d sinirem•s.Spir.d slairways arc perniitted to bc dwclling units and slccping uni�s in Group R-2 and <br /> used as a componen�in Ihe means o(egress only wilhin dwell- R_;�cupancies do nnt rcquirc hnndrails. � <br /> ing uniis or fn+m�i spacc not mnrc than 250 syuarc fcet(23 mZ) ���� Slairway to tm�L In buildings locatcd four or morc <br /> in arca:md scrving not morc th:m five ixcupanis,or from gal- stones in hcight aMwc gradc planc,onc stainvay shall cxtend�o � <br /> Icries, ca�walks ;md gridirons in aceordancc wiih Section ���e ruof sorfacc,unless the roof has a slope steeper than four <br /> 1015.6. unils vertical in 12 units horizoNal (33-pcn:ent slopc). In <br /> A�.iinl stairway shall h:rve a 7.5 inch(191 mm)minimum buildings without an occupied roof,access to the rcx�f fmm the <br /> cicar t!oaJ depih:ii a�x>im �2 inches(305 mm)from Ihe nnrmw ��p stoq•shall be permiucd�o be by an altemating trcad device. <br /> cdEc.Thc riscrs sh�dl be sulficicnt to provide a headroom of 7R ���� � R�f acce.cs.W hcre a siainvay is pmvided to n <br /> inches(1981 mml minimum.but riserheight shall not be more T�� ;�ecess to the roof sNall be pmvided thmugh a pent- <br /> ihan 9.5 inches(2d1 mm)•Thc minimum sminvay width shall house complying with Section 1509.2. <br /> bc:fi inchcs(6G0 mm). <br /> Exception: ln buiidings without an occupicd roo(. <br /> IfNl9.9.Uternatin�trced devices. Apemating lrcad Jevices ,iccess to thc roof shall he penniacd to be a roof hatch or <br /> arc limiied�o an cicmcnt of a mcans o(egress m buildings of ��� �{��r nnt Iers than 16 syuare feet(I.5 m�)in area and <br /> Groups R H and S fmm a mezzanine not morc than 250 squarc hav ng a minimum dimcnsion of 2 feet(610 mm). <br /> fcct(23 m')in arca and which scrvcs na�morc than live cxcu- <br /> p;m�s;in huiidings o(Gmup 1-3 fmm n guard towcr,observa- 11N19.11.2 Pmtcetfon at mot hatch openin�.s.Whcrc thc <br /> iion siaiion or cnmrol room not more than 250 syuare(eel(23 nx�f hatch opening providing the requircd access is IcKated <br /> m�)in nrca and for:�ccess�o unoccupied mofs. within 10(eet(3049 mm)of the mof edge,such rooC access <br /> IfN19.91 Handrxils of alternalinR lread device�. Hand- °r mof edge shall he pmtected by guards installed in accor- <br /> � rails shall hc pmvidcd on ho�h sides of altemating trcad <br /> dance with the provisions of Section 1013. <br /> devices and xhall comply���ith Section 1012. <br /> IINIy.Y.2 7Ycads of allcrnaling iread deviccs.Altemating SECTION 1010 <br /> aead de��ice� shail have a minimum projected uead of 5 RAMPS <br /> inches(I 27 mml,a minimmn vead depth of&.5 inches(216 ]�10.1 Scope. The provisions of this seclion shall apply to <br /> mm). :i minimum tre�ul�vidth of 7 inches(17R mm)and a ramps used as a com�nent of a mcans o(cgress. <br /> m;uimum riser height of 9S inches(241 mm).The inilial Exce tions: <br /> tre,id of thc dc��ice shall be@in a� the samc elcvaiion as the � <br /> pladonn.Imiding or Ooor sudace. 1. Other than ramps that are part of the accessible routes <br /> pmviding acccss in accordancc with Scctions 110E.2 <br /> r xception:Altcmating trcad deviccs used as an elemcni �hmugh 1108�.3 and 1108.2.5,rampcd aixles within <br /> of a means of egress in buildings fmm a me�zanine area assembly rcx�ms or spaces shall contortn with the pm- <br /> not marc th�m 250 xyuarc feet (23 m') in area which ��isions in Scc�ion 1025.11. <br /> scrvcs not morc Ih:m fiee occupants shall have a mini- <br /> ❑�iu»ri7ijccicdircndofR.Sinches(216mm)wilhamini- 2. CurbrampsshallcomplywithlCCAl17.L ///- <br /> 214 20081NTERNATIONAI BUILDINO CODE��6,��J/� I <br /> 'J <br />