I think this is called an alternating tread stair. Usually the space saved is not so much about shoulder to shoulder width, but slope. With one of these, you get higher faster as you move forward than on a conventional stair...
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I think this is called an alternating tread stair. Usually the space saved is not so much about shoulder to shoulder width, but slope. With one of these, you get higher faster as you move forward than on a conventional stair...