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<br />and serving as a landing. �he bo�com or rop riur may be rcduced along �he slape to Icss than a����s 00? mm)
<br />� inheightwi�hthevariationinheightohhebonomoitopr,�ernatcy—ceM;inches(76mm)inevcry3feet
<br />� (914 r n( smirway wid�h. . . � 1 . . . ,. •
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<br />IOOG.4 4VinAin� Slairways. In Group R, Division 3 Occupancies and in private stairways in
<br />Group R, Division 1 Occupancies, winders may be uud if the required width of run i; provi�ed at a
<br />point not more than I2 inches (305 mm) from the side of the staieway wherc the trcads are nartower,
<br />but in no case shall any widih of run 6e lcss than 6 inches ( I52 mm) at any point. �
<br />1006.5 Circular Slairways. Circular swirways may be used az an exit, provided the minimum
<br />width of run is not less than (0 inches (254 mm) and the smaller radius is not less than twice the
<br />widih of the stairway. 71u largest tread width or riser height within any flight of stairs shall not ex-
<br />ceed the smallest by morc th. n�/g inch (9.5 mm). � � �
<br />1006.6 Spiral Stairways. In Group R, Division 3 Occupancies nnd in private stairways within
<br />individual units of Group R, Divisiun I Occupa�:cies, spiral stairways may be installeQ: Such stair-
<br />wa/s may be used for required exits when �he area served is limited to 400 squarc (eet (37.16 m'-).
<br />Ttie tread must provide a clear walking area measuring at le�st 26 inches (660 mm) fmm the omer
<br />edge of the supporting column to the inner edge of tho handrail. A run of at least 7�/z inches ;191
<br />mm) is to be provided at a point 12 inches (305 mm) Crom where the tread is �he nanowest. The rise
<br />must be sufficient to provide 6-foot 6-inch (1981 mm) headroom. Tt�e rise shail not exceed 9�/,
<br />inches (241 mm). � �
<br />1006.7 Landings. Ev-..y ianding shnll huve a dime��ion measured in the direction o( travcl not
<br />less than the width of the stairway. Such dimension nred �ot excecd 44 inches (� I I8 mm) w!�en �he
<br />stairhas a straight run. Thero shall not be mare �han :2 fer.t (3658 mm) venically betwcen landings.
<br />For landings with adjoining doors, see Section 10.'14.1G. -. .
<br />F.XCEP7'ION: Slain serving an unoccupicd iwt e¢ eaempt from lhese provisions. �
<br />1006.8 Qasement Stairways. When a basement stairway aad a stairway to an upper stury termi-
<br />nate in the same exit enclo;ure, an approved barrier shall be provided to prevent persons from con-
<br />ti:ming on into the basemen[. Directional exit signs shall Ix providcd as specified in Section7013.
<br />i006.9 .Fiandrails. Stain�ays shall have handrails on each side, end every staineay required to be
<br />more than 88 inches (2235 mm) in wid!h shall tx provided with no[ less than one intermediate hand-
<br />rail Cor each 88 inches (2235 mm) of � equired width. lntermediate handrails shall be spaced approx-
<br />imately equally across with the entire wirth of the stainvay. . . ��
<br />EXCEP'CIONS: I. Stairweys less inan 44 inche; (1118 mm) in width or stairHays ecrving one individual
<br />dwelling unit in G`oup R, Civision 1 or 3 Occupancits or a Group R, Division 3 cor�grcgote rcsid<nce may
<br />� have one handmil. � � - � ' • � �
<br />� 2. Private stairways 30 inches (762 mm) or less in height may have bandrails on one si3e only. �
<br />3. Siairways having less ihan four riscrs nnd urving one individual dwelling unit in �iroup R, Divisioi I
<br />, or3,oraGroupR,Division3congmgalercsidenceotservingGroupUOccupanciesn«dnothavehandrails.
<br />The top of handrails and handrail extensions shall be placed no[ less than 34 inches (864 mm) or
<br />more than 38 incf�es (965 mm) above the nosing of treads and landings. Handrails shal! be continu-
<br />1-182
<br />1994 UNIFORM BUILDING CODE 10Q6.9-1006.15
<br />ous the full length of the stairs und, except for private stairways, at least one handrail shall extend in
<br />ihe direction of the stair run not Iess than 12 inches (305 mm) beyond the top riser nor less than t2
<br />inches (305 mm) beyond the bottom risec Eads shall be rewmed or shall tertnina�e in newel posts or
<br />sa(ety tcrniinals. �
<br />The handgrip ponion of handrails shall not bc less than I�/q (32 mm) inches nor more than 2 in- �
<br />ch�s (S 1 mm) in cross-sectional dimension or the shape shall provide an equivalent gripping sur-
<br />fnee. The handgrip ponion of handrails shall have a smooth surface wiih no shary comers.
<br />H:mdrails projecting from a wall shall huv<a space of not less than I�/, inches (38 mm) ben��cen
<br />the wall and thc handrail.
<br />100fi.10 Cuardrails. Smirways open on one or both sides shall have guardmils as required by
<br />ScrrOon IOOI.S.
<br />1G';.11 ProteclionofExterior�VallOpenings. ExceptinGroupR,Di�•ision30ccupancies,all
<br />openings in the ex�erior w�all below and within 10 fcet (3Q38 mm), meawred horizontally, of an
<br />exterior cxit stairway or unprorected openings in an imerior exit stairway serving a building over
<br />t�co sieries in hzight or a iloor level having such openings in t�vo or more �uors below shall bz pro- I
<br />tected by fised, self•closing, or automatic-clusing fire assemblies havins athme•founhs-hour fire-
<br />pro�action rating. �
<br />ESCE('TIO�S: I.Openings may tx unpwtened whrn tH�o separalcd eilcrior stairwn)'s sen�e an uterior
<br />exit b�lcunv.
<br />2. Proiec�ion of openings is nm rcyuircd for open parking garages conformine m S.ciir � JOS.
<br />1006.1? [nterior Strire�oy Conslruction. Intrrior stainvays shall be conswcted as specified in
<br />Sections 602.4. 603.4, 60-1.4, 605.4 and 606.4. 5�$
<br />Escapt �ahan enclosed wable spacz under stairs is prohibited by Stciion 1009.6, �he walls and
<br />soltits of Ihe endu<eJ snace sh:�ll hr mntec�rd on �he enclo.ed siJc as rtouirad for one-hour firc-
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