What flooring material works best over radiant floor heat?
The best surface for a radiant floor is something with "thermal mass". For a detailed explanation of thermal mass, here's the Wikipedia definition. Materials that have high thermal mass are those that are able to store heat. Examples are concrete, many types of tile and stone, and Earthen floors. Materials that don't have high thermal mass are wood floors, laminate, and carpet. The reason you want a flooring with higher thermal mass (ability to store heat) is that it will emit the heat from the radiant floor system at a desirable rate and also the floor will have a nice warm feel to it.
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