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• <br /> 1- MyBuldngPermit.com <br /> a service of eCityGovnet 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 /> __Noersing required at solid <br /> ris <br /> 3/4" - 1 1/4" <br /> Nosing <br /> " <br /> Landin Tread <br /> 36" min. to nearest 10" min. <br /> obstruction Pr 'r At open risers, a sphere <br /> 4" in diameter cannot <br /> pass through (except for <br /> • stairs with a total rise of <br /> itgravAriramormi 30" or less). <br /> i <br /> `ti 1 4 <br /> %rrErrworio� <br /> Prated enclosed <br /> u) co, CO accessible space under <br /> iY r- E stairs with 1/2"gypsum <br /> �"� board. <br /> Figure 1: Typical Stair Treads and Risers <br /> Stair Treads and Risers <br /> O 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 /> Illumin ion <br /> ❑ erior tairways shall be provided with an artificial lights rce to illuminate landings and <br /> treads. here shall be a w itch at each floor lev to cont I the light source where <br /> stairwa has 6 or mor isers. ( 03.7) <br /> ❑ Exterior airw shall be provided ' an artificial light source loca a top landing of <br /> the stairway and located at the bottom landing where accessing a basement. (R303.8) <br /> Handrails (ZF y o e- /1"042- `Stt25, Vs ,7 o �'„ <br /> O 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 /> eC ynv.net \DI 10 <br /> 2005 eCflyGoAliance <br />