Radiant heat shop floor:
Top soil has been removed very hard base ground (use a breaking bar to be able to dig in it)
3-7" of 3/4" crush gravelmoisture barrier HERE?
2" polystyryene extruded foam insulationmoisture barrier HERE?
concrete reinforcement mesh
1/2" pex heat tubing 4" concrete with plasticizers and fiber reinforcementEveryone in the businss has a different opinion if it's below the foam or on the foam.
Concrete engineer says on the foam radiant installer says below the foam.
Alan