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i <br /> ; <br /> � <br /> � <br /> .�� <br /> , <br /> - . - �.. <br /> �see eomoN s�oe <br /> '. . : � � <br /> - -. J �`'=a,n.'y...-..:- o _''�*' � >c-•=::�.: <br /> . Icss than twicc thc width of the stairway.7'he Isgcst tread width or riser height �; I <br /> • � � ' - . - . �- .- ' � wiehin any flight o(stairs shall not ezceed the smallat by more ihan�/e inch. � I . <br /> " . � .. . �. " (Q Spiral S�airways. In Group R. Division 3 Occupancics and in private , j <br /> � � ' ` sU'vways within individual units o(Gmup R, Division 1 Occupancies, spiral �. �,��� , <br /> , . , stairways may be installcd.Such stairways may be uscd(or required ezits when � <br /> �- � -� �' . . the area served is limited to 4IX1 square fceL � � <br /> . �� - ' ; Thc tread must provide a cicar walking atca measuring aUeast 26 incha from � '���., <br /> - theoureredg2ofthcsupportingcolumntotheinncredgeoflhehandraii.Aruno( , .,r� <br /> � -� ' � . - " - . ._ . . � . at ieast 7�h inches is to be provided at a point 12 inches from where the tread is ttm �� �, ��;,. , <br /> ' � , nerrowest.The rise must be sufficient to provide Gfoot 6-inch headroom.7tie i � <br /> -. - � � ' riu shall not oxceed 9�!_inches. <br /> �" <br /> � � � � � � �� � � � � : • - - fg)Landings.cvery landing shall have a dimcnsion measurcd in the dircaion ' <br /> � � ' �� . of travel not less than�hc a�idth of the stairway.S�uh dimcnsion need not ezceed � � <br /> . � - - " � -- � � - � �- 44incheswhtnthesuirhasastraighlrun.Forlandingswithadjoiningdoors,see ! ��� <br /> .. � � - � �- . � Sation 3304(j). <br /> � � - EXCEPT70N:Slairs urving nn unwcupied mof are ucmpt from theu provi- � <br /> •c .'. �' ' sions. � ' <br /> ix';SrJ- � '✓,i`3'-i � �.=.:l�a`. 1.�'� 'r� �`y �: .� � <br /> � (h)BasemmlStainrays.Whenaba�ementstairwayandastairwayroanupper i , <br /> . . . ,-. � .. . � srory terminate in the same cxit enclosurc,an approved barrier shali be provided `- <br /> _ '� <br /> � , ,. . � '� � � to prevrnt persons fmm continuing on into the basement.Directional exit signs <br /> , , � ._ � _ - shall bc provided as spccificd in Scetion 3314. ��,1 . <br /> - ' . � ��. � . ' � . . (i)DislancaBetweenLandings.'Ihereshalltxnotmorethanl2feetvertically �� <br /> . . . ' . . . .. � . . � . betwecnlaedings. <br /> . � � .. ' ' � � . ' (j)FGndnlle.Sta'uways shall have handrails on cach sidc,and every stairway � <br /> - � ' � . �. � . � - ', requiad ro be morc than 88 inches in width shall bc nrovided with not less than <br /> � one inurmediam handrail (or cach 88 inches of requ'ved width. Intertnediate <br /> `''.. <br /> � _ handrailsshallbespacedapproximatelyeq�iallyacrosswiththeentircwidthofthe <br /> . � . . � • . . _ .. . , staitway. <br /> . � EXCEPTIONS; 1.Stairweys less Ihen 44 inches in width or stai'weps serving � <br /> " � one individuel dwelling unit m Group R.Division 1 or 3 Occupancies may have one <br /> -,�._ . .y.... .,,, �t.%;s F . ��.'7.;^ � i hendnil. <br /> �'/� ...i .: �✓: 2. Privam ste'uweys 30 inches m less in heighl may have handrails on one side , <br /> . . . . . . . . " .. . . _ . . only. <br /> �- � � - � � 3. Stairweyshe�inglesathanfourrisersendurvingoneindividueldwellingun:; �� <br /> , � . � in Gmup R, Division 1 or 3, or un•ing Gmup M Occupancies need no� huve j <br /> . . . . - . � . hnndlails. <br /> , � � � � � . � . ?'he rop of handrails shall be placed not less than 34 inches nor morc than 36 � , <br /> � � � . � ' — � . �� � � inches above the nosing of veads.They shall be wntinuous�hc full Icngtti of the i <br /> ' � � - � _ . stairs and ezcept tor pnvate stairways at least one handrail shall extend not less <br /> � � � . , _ . � � than 6 inches beyond the rop and botrom nsers. Ends shall be retumed or shall . <br /> � . •- � � . . ' . . � tertninate in newel posts or sa(cty icrminals. � <br /> � � � � � � . - - � The handgrip porcion o(handrails shall be not less than I�/z inches wr morc i I <br /> ' � � - -� then2inchesincross-sectionaldimensionortheshapeshallprovideanequivalem I <br /> � � � �� gripping sur(ace.7'hc handgrip portion of handrails shall have a smooth surfacc <br /> - � � � with no shatp comers. <br /> . . .. . . . � . 645 � <br /> � � . C� Ra1'= �ll.:` . . <br /> � r <br /> . � . I <br /> . ' _. _ . .. . . �. � <br />