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Porches, balconies or raised floor surfaces located <br />STAIRWAY ILLUMINATION <br />34. R311.7.8, R303.6.1. <br />more than 30” above the floor or grade below shall <br />have guards not less than 36” in height, including All interior and exterior stairways shall be provided <br />with a means to illuminate the stairs, including the <br />areas enclosed with insect screening, except where <br />landings and treads. Interior stairways shall be <br />guards are required at the open side of stairs, the <br />provided with a light located in the immediate <br />height may be reduced to 34” above the stair nosing. <br />vicinity of each landing of the stairway that <br />Guardrails shall be designed such that a sphere 4” in <br />provides at least 1 foot candle of illumination <br />diameter cannot pass through, except the triangular <br />measured at the center of treads and landings. A <br />opening between a riser, tread and the bottom rail <br />wall switch shall be provided at each floor level <br />of the guard may be of such size that a sphere 6” <br />where the stairway has six or more risers. Exterior <br />cannot pass through. <br />stairways shall be provided with an artificial light <br />HANDRAILS: <br />31. IRC Section R311.7.7 & 311.8.3. <br />source located in the immediate vicinity of the top <br />All stairways with 4 or more risers and ramps with <br />landing of the stairway. Exterior stairways <br />exceeding a slope of 1:12 (8.33%) shall have at least <br />providing access to a basement from the outside <br />one handrail. Such handrails shall be placed not <br />grade level shall be provided with an artificial light <br />less than 34” or more than 38” above the nosing of <br />source located in the immediate vicinity of the <br />the treads. Handrails for stairways shall be <br />bottom landing of the stairway. The illumination of <br />continuous for the full length of the flight from a <br />exterior stairways shall be controlled from inside <br />point directly above the top riser to a point directly <br />the dwelling unit. <br />above the lowest riser of the flight or the full length <br />USABLE SPACE UNDER STAIRS: <br />35. IRC <br />of a ramp. The handgrip portion of the handrail shall <br />Section R302.7. The walls and soffits of enclosed <br />not be less than 1-1/4” or more than 2-1/4” <br />usable space under stairs shall be protected <br />(maximum 2” if circular) in cross- sectional <br />on the enclosed side by not less than 1 layer of <br />dimension, and shall be of a “graspable” shape. (see <br />½” gypsum board. <br />Page 27 for handrails) There shall be a space of not <br />WINDING STAIRWAYS: <br />36. IBC 1009.3.1 Winding <br />less than 1-1/2” between the wall and the handrail; <br />stairways shall have minimum tread depth of 6” <br />however, the handrail shall not project more than 4- <br />and a minimum tread depth of 10” measured <br />1/2” into the required stair width. Handrail ends shall <br />between the vertical planes of the foremost <br />be returned or shall terminate in a newel post or <br />projection of adjacent treads at the intersections <br />safety terminals. <br />with the walk line. <br />STAIRWAYS: <br />32. IRC Section R311.7. Private <br />SPIRALSTAIRWAYS: <br />37. IRC Section 311.7.9.1. <br />dwelling stairways shall not be less than 36” in width <br />Spiral stairs must provide a clear walking area <br />and shall have a headroom clearance of not less <br />measuring at least 26” from the outer edge of the <br />than 6 feet 8 inches measured vertically from the <br />supporting column to the inner edge of the <br />sloped plane adjoining the tread nosing, or landing <br />handrail. The tread run must be at least 7 ½” at <br />surfaces. (See Item 39 for spiral stairways.) <br />the point 12” from where the tread is the <br />STAIR RISE & RUN: <br />33. IRC Section narrowest. The rise must be sufficient to provide <br />6’-6” headroom, and each riser shall not exceed <br />311.7.4. <br />9 ½ inches. <br /> Maximum riser height shall be 7-¾ inches and the <br /> <br />minimum tread depth shall be 10 inches. The greatest <br />riser height may not exceed the smallest by more than <br />3/8 inch. The radius curvature at the leading edge of <br />the tread shall be no greater than 9/16 inch. A nosing <br />not less than ¾ inch but not more than 1-¼ inches <br />nosing shall be provided on stairways with solid risers. <br />The greatest nosing projection shall not exceed <br />the smallest nosing projection by more than 3/8 inch <br />between two stories, including the nosing at the level <br />floors and landings. Exception: A nosing is not required <br />where the tread depth is a minimum of 11 inches. <br />Open risers are permitted, provided that the opening <br />between treads does not permit the passage of <br />a 4-inch diameter sphere. <br />The County of Hawai‘i is an Equal Opportunity Provider and Employer <br /> <br /> <br />101 Pauahi Street, Suite 107 74-5044 Ane Keohoklole Hwy <br />ā <br />Hilo, Hawai‘i 96720 Kailua-Kona, Hawai’i 96740 <br /> <br />Tel: (808) 961-8331 Page 10 Tel: (808) 323-4720 <br /> <br />