Western Steel Erection plan review notes

Home Browse Search

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 that will deactivate the egress-con- greatest riser height within any flight of stairs shall not exceed the smallest by more than trol device shall be initiated whenever a manual force of not more /$inch(9.5 mm).Except. permitted in than 15 pounds(66.72 N)is applied for two seconds to the panic Sections 1003.3.3.8.1, 1003.3.3.8.2 and 1003.3.33.8.3, the run bar or other door-latching hardware. The egress-control device shall not be less than I1 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- cent treads or nosings. Stair treads shall be of uniform size and control device shall not tfield adjustable. shape,except the largest tread run within any flight of stairs shall not exceed the smallest by tri*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 less than 10 and stairways to unoccupied roofs may be constructed with an 8-inch- aximum (203 mm) rise and a 9-inch- 6. The unlatching shall not require more than one operation. minimum(229 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 hard- or driveway having an established grade(other than natural earth)and ware reading: serving 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 WILL 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 1/8 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 nosings 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 identification. 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 the 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 comply 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 1/4 unit vertical in 12 units in a means of egress system shall conform to the applicable horizontal(2%slope).For landings with adjoining doors,see Sec- tion 1003.3.1.7. requirements of Section 1003.3.1. EXCEPTIONS: 1.In Group R,Division 3,and Group U Occupan- EXCEPTION:Gates surrounding stadiums may be of the horizon- cies and within individual units of Group R,Division I Occupancies, tal 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 with the side,and every stairway required to be more than 88 inches(2235 requirements of Section 1003.3.3. For the purposes of Section mm)in width shall be provided with not less than one intermediate 1003.3.3,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 entire width of the stairway. 1004.3.2. EXCEPTIONS: 1. Stairways less than 44 inches (1118 mm) in EXCEPTION: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 I or 3 Occupancy or a Group R,Division 3 congregate resi- For the purpose of this chapter,the term"step"shall mean those dence may have one handrail. portions of the means of egress achieving2.Private stairways 30 inches(76_' mm)or less in height may have a change in elevation by a handrail on one side only. means of a single riser. Individual steps shall comply with the 3.Stairways having less than four risers and serving one individual detailed requirements of this chapter that specify applicability to dwelling unit in Group R,Division I or 3,or a Group R,Division 3 con- steps. gregate residence or Group U Occupancies need not have handrails. 1003.3.3.2 Width.The width of stairways shall be determined as The top of handrails and handrail extensions shall not be placed specified in Section 1003.2.3,but such width shall not be less than less than 34 inches(864 mm)nor more than 38 inches(965 mm) 44 inches(1118 mm),except as specified herein and in Chapter 11. above landings and the nosi.:g of treads.Handrails shall be contin- Stairways serving an occupant load less than 50 shall not be less 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 365 mm eyon t e to riser nor less than 12 inches m e myond Handrails may project into the required width a distance of the b om riser.Ends shall be return— e-3 or shah have rounded ter- 31/2 inches (89jnm) from each side of a stairwa,:. Stringers and minations or bends. other projections such as trim and similar decorative features may EXCEPTIONS:1.Private stairways do not require handrail exten- project into the required width 11/2 inches(38 mr +from each side. sions. 1-109