Stringer

Spacing. The spacing between the outside stringers and intermediate stringers.

Height. The distance from the bottom of the stringer to the underside of the tread/riser intersection. Specifying a stringer height that is the same as the overall height of the staircase creates a staircase that is completely closed on the sides. In other words, the stringers go right to the ground.

Width. The thickness of the stringer members.

Riser

Closed Riser. Inserts riser boards under the steps. If you leave this disabled, the staircase will be open under the treads.

Select. Click this button to select a riser board to use.

Spacing. When the riser comprises two or more boards, this is the spacing between the boards.

Angle. The tilt of the riser boards. A value of 0 means the board is perpendicular to the step (straight up and down). A value above 0 tilts the riser down toward the back of the staircase. The maximum angle allowed is 20º.

Tread

Select. Click this button to select the type of wood to use for your steps.

Spacing. When each step comprises two or more boards, this is the spacing between those boards.

Nosing. The distance the step extends past the riser.

Overhang. The distance the ends of the steps extend past the outer stringers.