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MyBui ldi ngPermit.com <br /> a service of eCityGov.net Construction Tip Sheet 01 <br /> Basic 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 /> Nosing riser <br /> 3/4"- 1 1/4" <br /> Landin Tread <br /> 36" min. to nearest 10" min. <br /> obstruction �'��������� At open risers, a sphere <br /> 4" in diameter cannot <br /> pass through (except for <br /> • stairs with a total rise of <br /> ,W' ./A..:i 30" or less). <br /> a� x <br /> Protect enclosed <br /> � <br /> u) co RI accessible space under <br /> r E �_,.,.� stairs with 1/2"gypsum <br /> board. <br /> Figure 1: Typical Stair Treads and Risers <br /> Stair Treads and Risers <br /> ❑ 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 /> El 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 <br /> • • eCityGov.net <br /> 2005.s oCityGoaH nce <br />