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f � � <br />Be/levue • Bothell • Issaquah • Kenmore • Kirkland • Mercer Island • Sammamish • Snoqualmie • Woodinville <br />�;, CONSTRUCTION TIP SHEET 1 <br />. MyBuildin�P�rmit.cam: Basic Stairs <br />October 2004 <br />36" min. to nearest <br />obstruction <br />� �. <br />,4°,� T� <br />��� <br />� <br />NOTES: <br />3G �' l41 e �. <br />�� <br />paG�� <br />�.N R�,IG <br />ZOU3 IFlC� <br />10" min. <br />Nosing <br />3/4" - 1 1 /4" <br />Typical Stair Section <br />R311 <br />Nosing required at solid <br />riser <br />At open risers, a sphere <br />4" in diameter cannot <br />pass through (except for <br />stairs with a total rise of <br />30" or less). <br />Protect enclosed <br />accessible space under <br />stairs with 1/2" gypsum <br />board. <br />1. These regulations apply to stairways for one- and two-family dwellings and townhouses subject <br />to the 2003 International Residential Code (IRC). Refer to the 2003 International Building Code <br />for requirements for stairs in other conditions. <br />2. For exceptions related to the construction of circular, spiral, or winding stairways, see R311.5.8. <br />3. The largest rise or run within any flight of stairs is not to exceed the smallest by more than 3/8". <br />4. A landing extending the width of the stair and measuring a minimum of 36" in the direction of <br />travel is required at the top and bottom of every stairway. <br />5. A floor landing is not required at the top of an interior flight of stairs, provided a door does not <br />swing over the stairs. <br />6. Handrails are required for stairways with four or more risers. See Tip Sheet 2 for additional <br />information regarding handrails. <br />7. Interior and exterior stairs must be illuminated with an artificial light source at each landing or <br />over each stairway section per R303.6. Light activation must be accessible at the top and <br />bottom of each landing without traversing any steps. Exterior stairways must be controlled from <br />inside the dwelling unit unless continuously illuminated or automatically co rol�led. <br />� � � � <br />JAN 1 9 2011 <br />� r�.'�,���'''`�-.� � cz <br />GENERAL INFORMATION: <br />Consult with your local planning department regarding required setbacks. <br />Obtain a building permit before starting construction. <br />The intent of this sheet is to address the basics of private residential stair construction only and does not address <br />the subject in great detail. Additional information can be found at your local building department, home <br />improvement store, or library. <br />This tip sheet is intended to show code requirements per the 2003 International Residential Code. <br />Services <br />-u1 � <br />:� <br />eCityGov.net <br />