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I have a few questions about an insulated slab detail found in 'strategies and details" section (http://www.greenbuildingadvisor.com/green-basics/slab-foundations ). What is the ideal substrate underneath the rigid insulation board and where, if necessary, should a vapor barrier be placed? In the past I have constructed in this order... slab, vapor barrier, 4" of gravel (passive radon vent integrated if EPA zone 1 or 2).
Thanks for the help!