1 ½ Inch. 4 ½ Inch. Maximum Not Acceptable Minimum 1 ¼ Inch. Maximum to 2 5/8 Maximum Handrail Ends Shall Be Returned to Walls or Newel Posts Handrails Shall Be Placed Handrails Shall Be Continuous Not Less Than 34 Inches Or The Full Length Of the Stairs More Than 38 Inches With 3 Or More Risers On At Above The Nosing of the Least One Side Of The Stairway Treads 9 Inch Minimum Tread 4 ½ Inch Minimum to 8 ¼ Inch Maximum Riser Nosing Of ¾ Inch Minimum To 3/16 From Step to Step 1 ¼ Inch Maximum Required 3/8 Overall On Stairways With Solid Risers And Treads Less Than 11 Inches Headroom in All Parts of the Stairway Shall Not Stairways With A Total Rise Be Less Than 6 Feet, 8 Inches Measured Of More Than 30 Inches May Vertically From the Sloped Plane Adjoining The Have Open Risers Provided Tread Nosing Or From The Floor Surface of The The Opening Is Less Than 4 Landing or Platform. Inches Enclosed Accessible Space Under Stairs Shall Have Walls, Under Stair Surface And Any Soffits Protected On The Enclosed Side With ½ Gypsum Board
4 ½ Inch. Maximum Not Acceptable 1 ½ Inch. Minimum 1 ¼ Inch. Maximum to 2 5/8 Maximum Handrail Ends Shall Be Returned to Walls or Newel Posts Handrails Shall Be Continuous The Full Length Of the Stairs With 3 Or More Risers On At Least One Side Of The Stairway Handrails Shall Be Placed Not Less Than 34 Inches Or More Than 38 Inches Above The Nosing of the Treads 9 Inch Minimum Tread 4 ½ Inch Minimum to 8 ¼ Inch Maximum Riser 3/16 From Step to Step 3/8 Overall Headroom in All Parts of the Stairway Shall Not Be Less Than 6 Feet, 8 Inches Measured Vertically From the Sloped Plane Adjoining The Tread Nosing Or From The Floor Surface of The Landing or Platform. Nosing Of ¾ Inch Minimum To 1 ¼ Inch Maximum Required On Stairways With Solid Risers And Treads Less Than 11 Inches Stairways With A Total Rise Of More Than 30 Inches May Have Open Risers Provided The Opening Is Less Than 4 Inches Enclosed Accessible Space Under Stairs Shall Have Walls, Under Stair Surface And Any Soffits Protected On The Enclosed Side With ½ Gypsum Board
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