Subfloor Boards - Radiant Floor Heating: How It Works - Bob Vila
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Radiant Panel Association
Premanufacture boards with a laminated layer of aluminum and a channel to accept tubing are screwed or nailed to the subflooring. Hardwood floors can be nailed directly to the subfloor plates or carpet and pad placed over the plates. It is also possible to nail a second subfloor over the plates for a smoother finish for vinyl areas. A cement board is used when tile or stone is to be installed. Particle board is not recommended as a subfloor.