walls with core faces in the middle of layers

[kwg06516]

I have a theoretical question about wall design.

Is it possible to design a wall where the core boundary lines fall in the middle of a wall layer?

Case in point is a complex wall with an 8" foundation wall that follows a building line along its exterior face.  Above that is 3'-6" of stone veneer/airspace/sheathing/6" stud/drywall.  Above that is EIFS/sheathing/6" stud/drywall.

The design calls for an insulation gap between the slab and the foundation and for the top of the wall to be 6" above the first floor level.  The 6" metal stud thus overhangs the top of the foundation wall by 1" on the interior side.

Ideally the floor would be flush and core would simply follow the studs but the building lines (controlled by the grid) control the placement of the foundation wall and no part of the upper wall lines up with the foundation wall.  Even worse the exterior finish falls 1/2" inside the exterior of the wall below and there should be no line drawn there.

How do we handle things like this in Revit?

[sgoodmansen · Accepted solution]

Doing it with the core is not possible.  Instead create a reference plane offset from the gridline and constrain it to the gridline.  Then add your walls and constrain them to the reference plane.

[rosskirby]

Model it like you'd build it.  Concrete foundation wall is one wall type, with its own core extents.  Ditto for the architectural wall above it.  Or am I misunderstanding your issue?