Use this procedure to change the height or the shape of the roof line of a curtain wall:
- Offset the roof line from the current height of the curtain wall.
- Project the roof line of the curtain wall to a polyline.
- Project the roof line of the curtain wall to another object, such as a roof or stairs.
You can also create a polyline that represents the current roof line of the selected curtain wall. You can then use this polyline to change the roof line of other curtain walls.
Note: To project the roof line to a polyline, draw the polyline first in Elevation view. For best results, the polyline should be parallel to the curtain wall. The polyline does not need to be in the same plane as the curtain wall.
- Select a curtain wall, and click
. 
The current roof line is the default value in the curtain wall style.
- Change the roof line of the wall:
If you want to … Then … offset the roof line from the current height of the curtain wall enter o (Offset), select the curtain walls to change, and enter an offset distance. Enter a negative value to project the roof line below the current curtain wall height. project the roof line to a polyline enter p (Project), select the curtain walls to change, and select the polyline. generate a polyline of the current roof line enter g (Generate), and select the curtain walls for the polyline to be created from. project the roof line to another object, such as a roof or stairs enter a (Auto-project), select the curtain walls to change, and select the object to project to. When projecting to stairs, make sure that the bottom riser or the stringer does not create a zero-height segment of curtain wall. remove any changes to the roof line enter r (Reset), and select the curtain walls to change. - Press Enter.
The new roof line value is used only on the selected curtain walls. The curtain wall style is unchanged.