Q: Uninsulated slab on grade home with high ceilings. Need advice for installation of XPS layer, hydronic radiant, and thin slab.

I have an un-insulated slab on grade home with high ceilings. I am installing hydronic radiant heat. I plan to lay down 2" XPS then the grid of 1/2" PEX stapled to that then pour a thin slab on that. Questions I have are: 1. Should I glue the XPS down or let it float? 2. How thick should I pour the concrete over the XPS? Thanks!

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