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• MyBui ldi ngPermit.com <br /> a service of eCityGov.net Construction Tip Sheet 01 <br /> asic Stairs <br /> This tip sheet reflects code requirements of the 2018 International Residential Code (IRC)with <br /> Washington State Amendments. <br /> Nosing required at solid <br /> riser <br /> / Nosing <br /> - Z- 314"- 1 1/4" <br /> Landin« Tread <br /> 1 Q" min. <br /> 36"min. to nearest . At open risers, a sphere <br /> obstruction ; <br /> 4" in diameter cannot <br /> r pass through (except for <br /> stairs with a total rise of <br /> • <br /> frOLIFWAIr 30"or less). <br /> 0 <br /> Protect enclosed <br /> accessible space under <br /> it ,ti E • stairs with 1/2"gypsu <br /> board. <br /> Figure 1: T •" ea•s an• `' - <br /> Stair Treads and Risers <br /> El The largest tread or riser within any flight of stairs is not to exceed the smallest by more than <br /> 3/8 inches. (R311.7.5) <br /> Illumination <br /> ❑ Interior stairways shall be provided with an artificial light source to illuminate landings and <br /> treads. There shall be a wall switch at each floor level to control the light source where the <br /> stairway has 6 or more risers. (R303.7) <br /> ❑ Exterior stairways shall be provided with an artificial light source located at the top landing of <br /> the stairway and located at the bottom landing where accessing a basement. (R303.8) <br /> Handrails <br /> ❑ Handrails are required on at least one side for stairways with four or more risers. See Tip Sheet <br /> 2 for additional information regarding handrails. (R311.7.8) <br /> January 22,2021 MyBuildingPermit.com I Basic Stairs // 1 <br /> ee tyGov.net <br /> ?;eCl Govauiance <br />