Can moisture from the sand and aggregate under a slab cause rising damp?
...in good condition. My plan was to lay four inches of aggregate /crushed rock topped with 2 inches of sand with a sheet of plastic layed on top of the sand. On top of the sand I intend to put 4 inches of insulation foam with a radon barrier (plastic sheet) between the foam and the final finished 4 inches concrete slab. ...