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OTSEGO COUNTY BUILDING DEPARTMENT Measured vertically from the sloped plane adjoining the tread nosing or from the floor surface of the landing or platform. Nosings of 3/4 inch minimum to 1-1/4 inch maximum required on stairways with solid risers and treads less than 11 RESIDENTIAL STAIR SPECIFICATION Headroom Height, Handrail Height, Riser Height and Tread Depth Tread Depth Headroom Height Riser Height Headroom Height Handrails shall be continuous the full length of the stairs with 4 or more risers on at least one side of the stairway. RESIDENTIAL STAIR SPECIFICATION Handrail and Guardrail Detail Size of Opening Handrail Height Guardrail Height 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 1/2" gypsum Stairways with a total rise of more than 30 inches may have open risers provided the opening is less than 4 inches. and treads less than 11 inches. Spacing of Rails side with 1/2" gypsum board.