What can cause walls not to grow up to roof planes?

[rockyshepheard]

I have a wall and a nice gable roof. I hear CA abhors a vacuum and readily fills the space with wall up to the roof.
For some reason (user error), this wall is happy to remain at the ceiling height. 
Is there a most common cause of this 'wall laziness'?
Thank you for any responses.
Rocky

 

[Ridge_Runner]

Do you have "Auto Rebuild Attic Walls" on? Found in Defaults/General Wall Defaults/Automatic Walls, toward the bottom.

 

Should be "Defaults/Walls/General Wall Defaults/Automatic Walls, toward the bottom.

[Chief16Designer]

You could open the wall check ballon through celling above 

[rockyshepheard]

2 hours ago, Ridge_Runner said:

Do you have "Auto Rebuild Attic Walls" on? Found in Defaults/General Wall Defaults/Automatic Walls, toward the bottom.

 

Should be "Defaults/Walls/General Wall Defaults/Automatic Walls, toward the bottom.

 

1 hour ago, Chief16Designer said:

You could open the wall check ballon through celling above 

 

1 hour ago, solver said:

I changed 1 thing that has nothing to do with the wall. The hint is in the image. What's different when compared to your plan?

 

Thanks all!
Ridge Runner- I did have "auto rebuild attic roofs" on in the defaults.
Chief16Designer- Checking "Ballon through ceiling above" worked! 
Solver-The only thing I see is the window is lower in the Z direction. see attached.

[rockyshepheard]

Thanks Solver et al.
In summary... 
if you check "Roof Over Room"  that creates gable wall without  "Balloon Through Celling Above" being checked. RESULT: gable wall and roof over room
and 
if you do not check "Roof Over Room", you can get gable wall by checking   "Balloon Through Celling Above. RESULT: gable wall with no roof over room.
I see. 
Thx