A 90″ diameter stair takes up a foot print that is similar to many medium sized helical or circular stairs. Many 7′-6″ diameter spiral stairs do not have inner handrail, but even with an inner handrail and sub-line outer rail, this stair may allow 2-way traffic.
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i need same headroom inside the house with doglegged staircase and outside the hous with spiral staircase enclosed in 7’6″ by 7’6″