To Create an Interference Condition in a Door/Window Assembly

Use this procedure to create a stair interference area in a door/window assembly. When you add an interference condition between a stair and a door/window assembly, a box is cut out around the stair based on the specified headroom height and side clearance. You have the option of cutting the infills, frames, and mullions of the door/window assembly.

1. Create a stair that intersects with a door/window assembly.
2. Double-click the stair to open the Properties palette.
3. Click the Design tab, expand Advanced, and expand Interference.
   

4. 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.

5. Click in the drawing, not on the stair, to remove the selection.
6. Select the door/window assembly to intersect, and click Door/Window Assembly tabModify panelInterference drop-downAdd.
7. Select the stair.
8. Specify whether to apply the interference condition to the infill, frames, or mullions of the door/window assembly.