Architectural Glossary - Stairs

Stair (Staircase , Stairway deprecated ): Construction, compromising a succession of horizontal stages, (treads or landings) that make it possible to pass on foot to other levels
Circulation Element: Construction for the movement of people or goods
Circulation Space: Space for the movement of people, goods or vehicles

Types of Stairs

Simply Supported Stair: Stair in which both ends of each step are supported
Cantilevered Stair: Stair in which one end only of each step is supported
Double Cantilevered Stair: Stair in which the steps are supported only on a carriage, usually centrally positioned
Straight Stair: Stair in which the direction is the same throughout
Turning Stair: Stair in which the direction is changed
Double Return Stair: Turning stair with one flight to a landing and two flights from that landing
Dog-Leg Stair: Turning stair of two flights with a half landing and without a stairwell
Open Well Stair: Turning stair with a stairwell
Geometrical Stair: Turning stair in which the outside string and handrail continue in an unbroken line with curved ends
Winding Stair: Turning stair that includes winders
Spiral Stair: Turning stair that describes a helix around a central column
Helical Stair: Turning Stair that describes a helix around stairwell
Circular Stair: Turning Stair shaped as a circle on plan
Elliptical Stair: Turning stair shaped as an ellipse on plan
Open Riser Stair: Stair in which the vertical spaces between successive treads are not fully filled by risers

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