I'm trying to add a slab edge to a ground floor slab (which is made up of a concrete slab (structure) over hardcore (substrate). The Slab Edge I'm using extends below the concrete line (think of a typical 45 degrees slab edge thickening) to the depth of the substrate. The slab edge has the same material as the concrete slab, but different to that of the substrate.
The problem i have is that Revit will not cut back the substrate to the line of the slab thickening. You actually get an error message saying that the slab edge in totally within another object (obvious!).
Not sure if there is a way around this or is it another wish list?
Instead of including the select fill as a layer in the Foundation Slab, try using a Building Pad or In-Place Family instead. Here are the general steps for the Building Pad methodology:
Create a Toposurface.
Create the Building Pad in the same shape as the Foundation Slab.
Create the Foundation Slab.
Add the Slab Edge thickened edge.
Join Geometry of Foundation Slab and Slab Edge if desired.
Use the Cut Profile tool on the Building Pad to graphically "cut" at the Slab Edge.
Please see the attached image.
Note that the Building Pad cuts the Toposurface to the depth you choose, thus giving a Cut/Fill volume. Set the thickness, depth, and material of the Building Pad to your preference.
The In-place Family methodology would be similar except that you would not explicitly need the Toposurface. In my opinion, the In-place method will take slightly longer to accomplish. However, the In-place method does allow for more flexibility to create complex shapes.
Brian E. Johnson, P.E. AEC Technical Specialist Autodesk, Inc.
I did find that when creating the slab layers, if you call the gravel, sand etc a finish material instead of a substrate, and don't put the vapor barrier in the assembly, the slab edge will join correctly with the slab, cutting out the underlayment.
Now I just have to get that to work for interior footings as well.