How can I mull this window? Top unit in stack crosses floors.

[GeneDavis]

See the pic.  The window stack at left, two windows mulled, has its top height at 8 feet in a room specified as 9/0 ceiling, no flat ceiling above.  I drew ceiling planes to vault the space.  The window stack at center is desired to be a three-high stack, mulled, and I cannot get the top unit to mull to the mulled stack below.  I select the stack below, and shift select the top window, and I do not get the blocking option.

 

I want the ceiling height at 9/0 to control wall heights and wall framing.

[PitMan71]

Try unmulling the bottom two and see if the top two will mull. That may tell you if they may be something with that top window that's keeping it from mulling.... such as the ceiling height. I can't remember if I have ever had a three mull stack like this. I have had 2 over 2 I know. I do remember having to mull those in a particular way.

[JKEdmo]

1 hour ago, GeneDavis said:

See the pic.  The window stack at left, two windows mulled, has its top height at 8 feet in a room specified as 9/0 ceiling, no flat ceiling above.  I drew ceiling planes to vault the space.  The window stack at center is desired to be a three-high stack, mulled, and I cannot get the top unit to mull to the mulled stack below.  I select the stack below, and shift select the top window, and I do not get the blocking option.

 

I want the ceiling height at 9/0 to control wall heights and wall framing.

 

I think the trick is to balloon frame that end gable wall.

[GeneDavis]

I balloon-framed the endwall and that did not do it.  I unblocked the lower two, tried blocking the upper two, and that's not working.

 

Attached is a pic of the entry door with sidelites, those done as a three-stack, and they block fine.  Block two, then block the block to the other.

 

As I said in the opener, I can get this to work by raising the room hight so the window is in the same room as the blocked unit below, but doing that raises the plate heights of the 9/0 sidewalls, something I don't want to do.  I can edit the framing, I guess, but would rather this work.

 

I can see when doing 3D floor overviews that the upper window is modeled in the attic, and not modeled on floor 1.  The opening is there, but not the window.

[PitMan71]

Have you tried copying the middle window up to be the third on top to make sure it has the same properties and dimensions? When I get a minute I am going to try and replicate and see what how chief behaves. Right now I am dealing with my own Chief setbacks.

Edited Friday at 06:27 PM by PitMan71

[JiAngelo]

What if you raise the ceiling height, mull the Unit then lower the ceiling height?