The depth of each tread on a circular staircase is measured 12 inches onto the stair from the inside of the handrail. Our example staircase has 13 treads within the 90 degree section, so each tread is divided at 6.92 degrees individually. The treads are then equally distributed Read more … by dividing 90 degrees by the number of treads needed. The inside radius (smaller) and the outside radius (larger) are formed from a common center point or "pivot point". While an elliptical design technically is a curved stair, a distinction between circular and elliptical must be made.Ī standard 90 degree circular staircase will have a curved section of stair that travels 90 degrees from the top to the bottom. While the circular and spiral designs have a center point and consistent curvature, the elliptical design has a complicated, ever-changing curvature that uses multiple axis and focus points. An elliptical staircase is built from a totally different geometry than a circular or spiral. A circular stair will meet code when designed and built properly. Spiral stairs can only be used as secondary stairs in limited applications. While a circular stair can also be called a "curved" stair, the spiral stair is a vastly different design usually reserved for very limited spaces. A spiral staircase utilizes a center support post with the stair treads arranged much as the spokes of a wagon wheel would be around the hub. The distance between the two curves (radii) creates the width of the staircase. These two curves commonly share the same center point. Circular, Spiral, And Elliptical StaircasesĪ circular staircase utilizes a large radius coupled with a somewhat smaller radius. ![]() The diameter of the circle will be exactly double the radius. When this center point is used to strike an arc traveling 360 degrees, it will produce a perfect circle. A radius is the distance from a center point, or pivot point, to an arc or curve.
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