Is it necessary to put plastic sheeting under a foundation slab that sits on top of a wall going below the frost line? See attached pic. Is the point of the plastic to keep water from wicking INTO the slab, or the other way around? I expect the ground will stay dry under my foundation.
How do i tie the slab onto the foundation walls? Do I just frame up around the foundation walls and pour on top of it?Usually the slab does not tie into the foundation, the walls are built on the foundation. The floor will be up against the foundation wall.
In Home Designer Pro 2018, I would like to be able to define a slab that is sitting on the foundation footing (and defined in the foundation section of the default settings). Specifically the slab would be defined as the top layer being concrete (with reinforcing steel mesh), the next layer below...

3. The foundation layout is completed by pulling strings across the batter boards to set the locations of the slab's outer edges, or the outer faces of foundation walls or piers.
Slab Foundation With Vapor Barrier. How To Build A Slab-on-grade Foundation. Slab On Grade Foundation. Frost Protected Shallow Foundation Details.

This particular example perfectly highlights why Plastic And Steel Under Foundation Slab is so captivating.
Each under-slab foundation area has an input pipe and an output pipe (on opposites sides of the area). Radon flush pipes. They are done using 2" PVC water pipe.
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Foundation slabs keeping the bottom reinforcement at the correct height. In-situ concrete floors when installing reinforcement mesh in cast slabs.Plastic spacer bars lighter, suitable for thin screeds. Steel spacer bars for heavier applications with thick reinforcement mesh.