The 72″ diameter stair is an excellent choice for a spiral stair as a secondary means of egress. Some clients prefer to use this stair, even if the primary staircase is just down the hall. It is easy to navigate and can be designed to have lower riser heights than smaller diameter spiral stairs. The 6′-0″ diameter stair normally only has an outer handrail at 36″ high, but it may be fabricated with an outer guardrail that is 42″ high and sub-line handrail (at 33″ radius) at 36″ high and still give plenty of step width to meet the minimum code requirements. This is the largest of the small spiral stairs with a more spiral/winding feel than a curved/sweeping feel.

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