Does IBC Allow Stairway Exception on Private Stairways

by Sean O'Hara, AIA, LEED AP on March 24, 2016

Does the IBC allow the old UBC 3306 (c) Exception of 8″ max rise & 9″ min run, for  “private stairways serving an occupancy load of less than 10?The design situation is a small retail store (Lubbock, Texas), owner access only, to a second story storage loft…Would appreciate your wisdom – Richard

Richard, unfortunately, the answer is no. There are only 5 exceptions to the 7 inch maximum rise and 11 inch minimum tread depth:
  • Alternating tread devices
  • Spiral stairs
  • Aisle stairs where the sightlines dictate steeper slope
  • R-3 stairs in dwelling units can go to 7.75 inch maximum rise and 10 minimum depth
  • Replacement of existing stairs where the space or construction will not allow it

Thanks for the question.

Originally posted 2010-02-01 12:01:25. Republished by Blog Post Promoter

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