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- Baluster
- A decorative vertical member, used to fill the open area between the railing and the floor or tread, adding safety, support and stability to the balustrade.
- Box Stair
- A stair where the carriages/skirt boards house the treads and risers forming a box-like unit. Box stairs are typically pre-assembled and delivered to the job site as one "boxed" unit.
- Curved Stair
- A stair that winds or curves it's way from one floor to the next. It may be constructed having one turn of direction, or a series of turns.
- Open Stair
- A stair where the treads and risers are exposed from one or both sides.
- Skirtboard
- A finished trim board used on either open or dosed sides of the stair as a decorative accent.
- Spiral Stair
- A stair where the treads form a circle around a center point as the stair ascends from one floor to the next.
- Straight Stair
- A stairway with no turns or intermediate landings.
- Tread
- The horizontal component of a stair on which one steps.
- Volute
- A rail fitting that scrolls left or right used as one option to start an Over-the-Post balustrade system.
- Walk Line
- The line along which most people walk as they proceed up a stair. Its location is critical to tread depth in winding and/or circular stairs.
- Winder Stair
- A stair that makes a directional change without the use of a platform.