Rogue ceiling plane cuts through roof

[ADallas]

I have a garage in which a bedroom was framed. The ceiling for this bedroom sits below the garage plate height. I tell Chief that it's a shelf ceiling and I get a ceiling platform as well as a ceiling floating above it at the garage plate height. Since the roof is 4:12, with a boxed eave, the ceiling is visible outside the roof. Can someone point out what I'm doing wrong?

The Garage room (no ceiling) specifies:
Ceiling: 112 1/2" (the garage plate height)

Stem Wall Top: 2"

Floor: 0"

Roof Over This Room: checked

 

The Bedroom specifies:

Ceiling: 96"

Roof Over This Room: checked

Flat Ceiling Over This Room: checked

Shelf Ceiling: checked

 

The wall that goes from Bedroom to Garage has:

Ceiling Platform: Automatic

This cross section is just what I'm trying to model, except for that extra line floating through the roof. If only I could select it and click Begone.

 

If I change the Bedroom and uncheck Roof Over This Room, it automatically unchecks Flat Ceiling Over This Room. The extra ceiling plane goes away, but so does the extra ceiling platform.

 

Thanks for your help in advance.

 

Ceiling Plane Test.plan

[mtldesigns]

I'm not able to look at it, but is that crown molding by chance?

 

Instead of a shelf ceiling, why not just put your own ceiling plane in?

[Alaskan_Son]

Just an idea to possibly hold you over but maybe uncheck Use Room Ceiling Finish for your roof planes, set your garage to Flat Ceiling Over This Room, and then delete the Ceiling Finish and Structural layers from your garage room. 

[ADallas]

Thanks, mtldesigns. It's not crown molding and I don't know a way to manually insert a ceiling plane.

I think your suggestion worked, Alaskan_Son, but at first it didn't seem to.

 

 

Roof Planes

Use Room Ceiling Finish: unchecked

 

Garage Room

Ceiling: 112 1/2"

Roof Over This Room: checked

Flat Ceiling Over This Room: checked

Ceiling Structure: 0"

Ceiling Finish: 0"

 

Bedroom

Ceiling: 84"

Roof Over This Room: checked

Flat Ceiling Over This Room: checked

Shelf Ceiling: checked

Ceiling Structure: 5 1/2" (2x6)

Ceiling Finish: 5/8" (drywall)

[Kbird1]

10 hours ago, ADallas said:

I don't know a way to manually insert a ceiling plane.

 

Ceiling Plane Tool is under the Roof Plane tools  just set the pitch to 0°

 

some pointers............

 

https://www.chiefarchitect.com/videos/watch/10149/where-to-draw-a-custom-ceiling-plane-inside-or-outside-of-the-room-s-wall.html?playlist=96

[robdyck]

I have the same issue. There's no getting rid of it! Using shelf ceilings has not been a problem in the past. I'll send this to Tech Support.

[ADallas]

Yes, that's it. Thank you, Kbird1 and mtldesigns! Today I learned a new trick: New 0-degree pitch ceiling planes do the right thing in terms of truncating interior walls.

 

Robdyck: I wonder if Build > Roof > Ceiling Plane would help your situation?

Edited April 17, 2022 by ADallas
Added details

[robdyck]

40 minutes ago, ADallas said:

Robdyck: I wonder if Build > Roof > Ceiling Plane would help your situation?

No, it doesn't. For some reason it'sbuilding a drywall layer at the default ceiling height of 109 1/8" even though I lowered the shelf celf ceiling to 97 1/8". The ceiling plane is NOT using room ceiling finish, nor are the roof planes over that area.