Does IBC Allow Stairway Exception on Private Stairways
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.
- Residential Spiral Stairs – Guidelines, Criteria and Dimensions
- New Definitions of Stair and Stairway Under 2009 IRC
- Commercial Stair Design – Guidelines, Criteria and Dimensions
- Handrail Extensions for Commercial Stairs
- Commercial Ramp Design – Guidelines, Criteria and Dimensions
- The Maximum Occupant Load in the Building Code – Not a Maximum
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