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Installing Radiant Hydronics on existing concrete floor

We are renovating our basement. The house (1929) has hot water heat with cast iron rads. The basement has nothing. I am determined to put radiant hydronic heat down there by means of an overpour on the existing concrete. Our dilemma is - do we need to put down rfoil or some such insulator before laying out the hose and pouring the concrete? Or do we just lay the hose directly on the existing concrete?


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