To Change the Interference Size of a Stair

Use this procedure to control the size of the stair interference area.

Specifying headroom height and side clearance for a stair and a space object

1. Double-click the stair to open the Properties palette.
2. Click the Design tab, expand Advanced, and expand Interference.
   

3. Set the size of the interference condition:

   If you want to…	Then…
   specify the height above the treads for the interference condition	enter a value for Headroom height.
   specify the left and right side clearances for the interference condition for straight and multi-landing stairs	enter values for Left and Right Clearance.
   specify the inside and outside clearances for the interference condition for spiral and U-shaped stairs	enter values for Inside and Outside Clearance.