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Thanks dirtsqueezer. Makes sense with the sand. The main reason for the mesh is so the radiant tubing can be tied to this grid. I could upgrade to rebar but don't have that budgeted.

Thanks guys for your help. Sounds like the consensus is to keep the vapor barrier whether it be below the slab or below the sand. There will be floor coverings added so I'd rather be safe than sorry. Any opinion on pea gravel in lieu of sand?

Good point on the rain. We get a lot of weather here in the Northwest. I don't have a water table problem so would like to eliminate the sheeting (6 mil poly)if possible. Since it can prevent curling, will I have a problem with my slab over the top of the interior footings without this sheet?

I have a daylight basement slab on grade to pour. The existing soils are compacted. I need to add about 8" of sand, gravel, ?, to reach sub-grade for my slab. Also, I have radiant tubing in the slab so will need to add insulation board. I am being told to go 4" of 5/8" gravel compacted, 4"...