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Flared Stairs and Curved Treads

Any stair section can be flared and/or treads curved using the Flare/Curve Stairs edit button.

Only exposed sides of a stair section can be flared. If one side of a stair section is against a wall or wrapped (see "Wrapped Stairs"), only the exposed end can be flared.

Flaring, curved treads, and special treads should be the last changes that you make to any stairs.

Creating a Flared Stair

Flared stairs grow wider near one end, typically sweeping outward at the bottom. Stairs can also be flared at the top or on both ends.

To create flared stairs
  1. Create the stairs and connect them to a landing, floor platform edge, or another stair section.
  2. Specify the section width, tread width, and any other needed information.
  3. Select the stairs and click the Flare/Curve Stairs edit button. New Flare edit handles display on all four corners of the stairs.
  4. Drag one of the corner handles to flare that corner. As you drag the flare, the Status Bar shows the distance the side handle moves. This allows you to move the opposite handle the same amount.


  5. When you are finished editing the flare, click the Main Edit Mode to restore the stairs' regular edit handles and toolbar buttons.

Symmetrically Flared Stairs

Use the dimension information that displays in the Status Bar as a reference to create symmetric flares on both sides.

Adjusting the Flare Radius

After a flared staircase has been created, you may want to soften the radius of the flare.

The four handles at the sides and the four handles at the corners flare the stair section when dragged outward. The two handles in the center of the section move the starting point for flaring along the stair section.

To adjust the flare radius

First, adjust the curvature of the flared section.

  1. Select the flared stair and click the Flare/Curve Stairs edit button to access the flare handles again.
  2. Select the handle along the flared edge of the stair. Drag this handle outward very slightly. This forms a more gradual flare.


Then, adjust the starting point of the flare:

  1. Select the flared stair and click the Flare/Curve Stairs edit button to access the flare handles again.
  2. This time, drag the lower of the two central handles upward. The handle above it moves with it. This moves the start point for the bottom flare from the middle of the section toward its top, making the flare even more gradual.


Treads Perpendicular to Flare

Flared stairs often look best when the treads curve to meet the flared side perpendicular to the radius.

To curve the edges of flared treads
  1. Select the flared stair and click the Flare/Curve Stairs edit button to access the flare handles again.
  2. Drag a corner edit handle upward one tread width or less.


  3. When you are finished editing the curve, click the Main Edit Mode to restore the stairs' regular edit handles and toolbar buttons.

This type of tread curving works only on flared edges and concentrates the curvature at that edge.

Flared treads can also be curved using the Curve edit handle, which curves the treads more uniformly.

Curving the Treads

When treads are curved, all treads in the section show some degree of curvature. Treads close to the curved end have a greater curve than those at the opposite end, but both ends can be curved.

To curve stair treads
  1. Select the staircase, then click the Flare/Curve Stairs edit button.
  2. Drag the edit handle at the center of the bottom edge a small distance to curve the treads.


  3. When you are finished editing the curve, click the Main Edit Mode to restore the stairs' regular edit handles and toolbar buttons.

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