Exterior Stairs Rise And Run at Exterior

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Exterior Stairs Rise And Run. Step tread + (2 × riser) = 26 or 27. The stair tread is the run plus the nosing.

In De Architectura, Vitruvius suggests a unit rise of
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The dimension of a riser should always be a minimum of 4” and a maximum of 7”. The rise should be between 5 & 7.5 with the ideal rise for a residence being 7. The run or tread is the part of the stairway that a person steps on.

In De Architectura, Vitruvius suggests a unit rise of

Its length is measured from the outer edge of the step, which includes the nosing if it is present, to the vertical portion of the stair called the riser. (2) private stairs are interior stairs within dwelling units and exterior stairs serving a single dwelling unit or a garage that serves a single dwelling unit. The ibc maximum rise of a single stair flight is 12.'. Landings (ibc 1011.6 & 1009.6.3) there must be a floor or landing at the top and bottom of each stairway.