Understanding interior walls in Revit Sample Project Snowden Towers

[mar_zan]

I'm studying the Snowden Towers Sample Project to get a good idea of best practices for modelling. 

I noticed that the interior walls are somehow constrained to the bottom of the floor above, and I cannot figure out why. Hoping someone could help me understand here. 

The wall is not attached to the floor above. And even when it is un-joined it still constrains. Even when I copy a wall and unconstrain it, it still automatically sits just below the floor above. 

What is going on here! I'm so curious now. 

martinNCGR6_0-1696890821971.png

[ToanDN]

The wall's top IS attached to the floor above, otherwise the Detach button would be grayed out.  Click the Detach Top/Base button, then Detach All, then you can adjust the height of the wall (via Top Offset) manually.

[SteveKStafford]

Many of them are associated with a Global Parameter, expand the properties palette so you can see the Associate Parameter button on the right edge of the palette.

[mar_zan]

Ah, interesting. However I'm not seeing this associate parameter you speak of. I'm going to take a guess that this is a full Revit thing. I'm currently using LT.

If that is the case, this all makes sense now. 

 martinNCGR6_0-1696894001938.png

[mar_zan]

Once I click detach, the detach all option is greyed out. I think @SteveKStafford was correct. The wall is constrained to a global parameter, and I'm not seeing the associate parameter option because I'm in LT.

[SteveKStafford · Accepted solution]

Aah, yes LT will make that hard. There are quite a few Global Parameters in the Architecture model, demonstrating their use.

[mar_zan]

@SteveKStafford Since I'm using LT, instead of relying on the Global Parameter (for the interior walls), I will make a Level for the bottom of structure for above floors. As a workaround.

[SteveKStafford]

I'd use Attach and select the floor above. Extra levels for anything other than primary vertical datum (floors/parapets etc) are not ideal. They create potential display issues in views, possible hosting mistakes, and additional view range complexity for the team.

[Philip_ATX]

Seems as good a place as any to ask for clarification in case it might help another:

Student here, working on a project for class.  I erred in attaching walls to ceiling on a project not realizing the future need for dropped ceilings for MEP etc. 

Detaching second floor walls was straightforward enough, but when I tried to do same on ground floor, the properties panel showed the "Top is Attached" box checked and greyed, and the "detach top/base" tool in and of itself did nothing.

I had to select "Detach All" on the contextual Options bar before I could return walls to their proper height.

I wonder if someone could direct me to a primer that discusses the nuances on attaching and detaching.  This did not seem intuitive to me, and I did not find a reason I had to do "all" on one set of walls and not the other.  I am sure I failed to do some "best practices" that necessitated this.

Thanks.