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I don't know common it is everywhere, but we often pour concrete on wood floors for radiant heating systems. For most houses the builder just adds an additional plate for the 1 1/2" thickness of the slab. The slab can be Gypcrete (lighter weight and self leveling) or standard concrete (adds thermal mass and can be stained, dyed, scored or whatever to be a finished floor).This house http://www.countryplans.com/bjork/ has concrete floors on both the main and upper floors. This is a traditional house as you can see so the floors are wood, carpet and tile over the slabs.