Here's a quick and simple fix to this situation for correct modeling in 3D and 2D: Think of the 4" concrete slab as a 'floor finish' and think of the substrate (a 6" gravel fill in this case) as the floor height. In the room dbx set the floor height 4" lower than the desired top of slab elevation. Keep the stem wall top at the correct elevation (floor to stem wall top will increase by 4"). This will allow materials to be set with custom CAD fill patterns for each layer. Final step is to set the
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