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August 12, 2004 <br />Interpretation <br />Proj: Snohomish County Admin. Plaza <br />Location: 3000 Rockefeller Ave. <br />Permit: 60408-002 <br />Code: 2000 International 3uilding Code <br />Subject: Acceptance of alternate design method per Section 104.11 <br />Proposal: The aisle stairs at the prop�sed amphitheater provide landings t�at <br />are approximately 34" deep (rougiily equivalent to residential landings) in- <br />between 13" deep treads. Section 1003.3.3.4 (stairvvay landings) excepts aisle <br />stairs complying with Section 1008. Section 1008 does not specify required <br />depths for landings. <br />If treads were created to be of equal length, they would be approximately 20" <br />deep each: <br />. This could result in an unusual gait for many users ar_customed tc ii" <br />treads. <br />. This would result in a greater trip hazard when iraversing to/from the <br />stairs and stepped platforms. <br />. The resultant 20" landings/steps would provide less room for <br />perpendicular transitions than the 34" landings. <br />. This interpretation is not without prescient and has been employed in <br />various projects around the region. <br />The proposal is therefore acceptable as Section 1008 has no specific <br />requirements for landing depths and the proposed design is accepted as <br />equivalent or superior to the prescriptive re�uirements for safety. <br />Tony R. Lee <br />Plans Examiner <br />