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Handrails shall be provided on not less than one side of each flight of stairs with four or more risers. R311.7.8.1 Height. Handrail height, measured vertically from the sloped plane adjoining the tread nosing, or finish surface of ramp slope, shall be not less than 34 inches (864 mm) and not more than 38 inches (965 mm).
Spiral stairways are permitted, provided the minimum width shall be 26 inches (660 mm) with each tread having a 7 1⁄2 inch (190 mm) minimum tread depth at 12 inches from the narrower edge. All treads shall be identical, and the rise shall be no more than 91⁄2 inches (241 mm).
Handrails shall be continuous within the full length of each stair flight or ramp run. Inside handrails on switchback or dogleg stairs or ramps shall be continuous between flights or runs.
Where stairways connect stepped aisles to cross aisles or concourses, stairway landings are not required at the transition between stairways and stepped aisles constructed in accordance with Section 1029.
STAIR BUILDING CODE. 2009 International Residential Code. Portions of this publication reproduce excerpts from the 2009 International Residential Code for One-and Two-Family Dwellings and 2009 International Building Code, International Code Council, Inc., Washington, D.C. Reproduced with permission. All rights reserved. www.iccsafe.org.
Stairways shall not be less than 36 inches (914 mm) in clear width at all points above the permitted handrail height and below the required headroom height. PHOTO 1. Handrails shall not project more than 4.5 inches (114 mm) on either side of the stairway PHOTO 2 and the minimum clear width of the stairway at
Handrails shall be provided on not less than one side of each flight of stairs with four or more risers. R311.7.8.1 Height. Handrail height, measured vertically from the sloped plane adjoining the tread nosing , or finish surface of ramp slope, shall be not less than 34 inches (864 mm) and not more than 38 inches (965 mm).
