Stair Terms

Definitions

Run: The horizontal or flat part of the stair is called the run and the vertical height difference between two stairs is called the run.

Rise: The rise is the vertical part of the stair between each tread.

Tread: The tread is the part of the stairs you stand on.

Nosing: The part of the stair that sticks out past the riser is called the stair nosing.

Tread Depth: is the tread run including the nosing.

Total Rise: the exact vertical distance from the top of one finish floor to the top of another finish floor.

Total Run: the exact horizontal distance from the edge of the upper floor to the end of the bottom riser.

Number of Risers: There is always one more stair riser than there are stair treads. This may be specified on blueprints or can be calculated specifically for each set of stairs. View our Riser Reference Chart.

Number of Treads: These may be specified on blueprints or can be calculated specifically for each set of stairs.
Run Per Tread - If you desire a larger tread, the run is the depth of the tread minus the nosing or the part that is rounded on the front of the tread.

Types of Stairs

Closed Stringer: wall on both sides of the complete length of stairs

Open Stringer on Right/Left: no wall on right/left side of the staircase looking up.  The wall on the right/left is located under the stringer and the spindles are placed right on the treads.

Partially Open Stringer on the Right/Left: no wall on the right/left of the staircase for part of the way going up the staircase. The distance on the floor to the wall must be shown on a diagram. Also specify if the staircase is extended to cover the end wall.

Two Step Winder to the Right/Left:

Two Step Winder

Three Step Winder to the Right/Left:

Three Step Winder

Also available at your local Home Hardware Building Centre

Available at your local Home Hardware Building Centre