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1 n � 1997 UNIFORM BUILDING CODE 1003.3.1.10 1003.3.3.6 3. The egress-control device shall be capable of being deacti- 1003.3.3.3 Rise and run.The rise of steps and stairs shall not be vated by a signal from a switch located in an approved location. less than 4 inches(102 mm)nor more than 7 inches(178 mm).The 4. An irreversible process[hat will deactivate the egress-con- greatest riser height within any flight of stairs shait not exceed the trol device shall be ini[iated whenever a manual force of not more smallest by more than 3/g-inch(9.5 mm).Except as permitted in than 15 pounds(66.72 N)is applied for two seconds to the panic Sections 10033.3.8.1, 1003.3.3.82 and 1003.3.3.8.3, the run bar or other door-latching hardware. The egress-control device shall not be less than 11 inches(279 mm)as measured horizontally shall deactivate within an approved time period not to exceed a between the vertical planes of the furthermost projection of adja- total of 15 seconds.The time delay established for each egress- cen[ treads or nosings. Stair treads shall be of uniform size and control device shall not be field adjustable. shape,except the largest tread run within any flight of stairs shall ot exceed the smallest by more than 3/g inch(9.5 mm). 5. Actuation of the panic bar or other door-latching hardware EXCEPTIONS:1.Private steps and stairways serving an occupant shall activate an audible signal at the door. load of fess than 10 and stainvays to unoccupied roofs may be constructed with an 8-inch-ma;cimum(203 mm) rise and a 9-inch- 6. The unlatching shall not require more than one operation. minimum(2z9 mm)run. A sign shall be provided on the door located above and within 2.Where the bottom or top riser adjoins a sloping public way,walk 12 inches(305 mm)of the panic bar or other door-latching hald- or driveway having an established grade(other than natural earth)and ware reading: ser�ino as a landing,the bottom or top riser may be reduced along the slope to less than 4 inches(102 mm)in height with the variation in KEEP PUSHING.THIS DOOR WILL OPEN IN height of the bottom or top riser not to exceed 1 unit vertical in 12 units SECONDS.ALARM WII,L SOUND. horizontal(8.3%slope)of stairway width. Sign lettering shall be at least 1 inch(25 mm)in height and shall 1003.3.3.4 Headroom. Every stairway shall have a headroom have a`stroke of not less than�/g inch(3.2 mm). clearance of not less than 6 feet 8 inches(2032 mm).Such clear- ances shall be measured vertically from a plane parallel and tan- Regardless of the means of deactivation, relocking of the gent to the stairway tread nosin�s to the soffit or other construction egress-control device shall be by manual means only at the door. above at all points. 1003.3.1.11 Safety glazing identi6cation. Regardless of the 1003.3.3.5 Landings.There shall be a floor or a landing at the top occupant load served, glass doors shall conform to the require- and bottom of each stairway or stair run.Every landing shall have ments specified in Section 2406. a dimension measured in the direction of travel not less than the width of[he stairway.Such dimension need not exceed 44 inches 1003.3.2 Gates. (1118 mm)where the stair has a straight run.At least one inter- � mediate landing shall be provided for each 12 feet(3658 mm)of ' 1003.3.2.1 General. Gates serving a means of egress system vertical stairway rise measured between the horizontal planes of shall compiy with the requirements of Section 1003.3.2. adjacent landings. Landings shall be level except that exterior 1003.3.2.2 Detailed requirements.Gates used as a component landings may have a slope not to exceed�/q unit vertical in 12 units in a means of e�ress system shall conform to the applicable horizontal(2%slope).For landin;s with adjoining doors,see Sec- requirements of Section 1003.3.1. tion 1003.3.1.7. EXCEPTIONS: 1.In Group R,Division 3,and Group U Occupan- EYCEPTION:Gates su�ounding stadiums may be of the horizon- cies and within individual units of Group R,Division 1 Occupancies, ta]sliding or swinging type and may exceed the 4-foot(1219 mm)max- such length need not exceed 36 inches(914 mm)where the stair has a imum leaf width limitation. straight run. 1003.3.3 Stairways. 2.Stairs serving an unoccupied roof are exempt.from these require- ments. 1003.3.3.1 General. Every stairway having two or more risers 1003.3.3.6 Handrails. Stairways shall have handrails on each serving any building or portion thereof shall comply wi[h the side,and every stairway required to be more than 88 inches(2235} requirements of Section 10033.3. For the purposes of Section mm)in width shail be provided with not less than one intermediate 100333, the term"stairway"shall include stairs,landings,hand- handrail for each 88 inches(2235 mm)of required width.Inter- rails and guardrails as applicable.Where aisles in assembly rooms mediate handrails shall be spaced approximately equally across have steps, they shall comply with the requirements in Section with the en[ire width of the stairway. 1004.3.2. E%CEPTIONS: 1. Stairways less than 44 inches(i118 mm) in E�CCEPTION:Stairs or ladders used only to attend equipment or width or stairways serving one individual dwelling unit in Group R, window wells are exempt from the requirements of this section. Division 1 or 3 Occupancy or a Group R,Division 3 congregate resi- dence may have one handraiL For the purpose of this chapter,the term"step"shall mean those 2,private stairways 30 inches(762 mm)or less in height may have portions oF the means of egress achieving a change in eleva[ion by a handrail on one side only. means of a single riser. Individual steps shall comply with the 3.Stairways havin�less than four risers and serving one individual detailed requirements of this chapter that specify applicability to dwelling unic in Group R,Division 1 or 3,or a Group R,Division 3 con- StepS. gregate residence or Group U Occupancies need not have handrails. 1003.3.3.2 �Vidth.The width of stairways shall be determined as The top of handrails and handrail extensions shall not be placed specified in Section 1003.23,but such width shall not be less than less than 34 inches(864 mm)nor more than 33 inches(965 mm) 44 inches(1118 mm),except as specified herein and in Chapter 11, above landin�s and the nosi.��of treads.Handrails shall be contin- Stairways servinJ an occupant load less than 50 shall not be lessl uous the full length of the stairs and at least one handrail shall �than 36 inches(914 mm)in width. � extend in the direction of the stair run not less than 12 inches(305 mm)beyond the top riser nor less than 12 inches(305 mm)beyond Handrails may project into the required width a distance of the bottom riser.Ends shall be returned or shall have rounded ter- 3�/2 inches (89 mm) from each side of a stairwa�. Stringers and minations or bends. other projections such as trim and similar decorarive features may EYCEPTIONS:1.Priva[e scairways do noe require handraii exten- project into the required width 11/�inches(38 mr )from each side. sions. 1-109