Radiant Floor Heating: How It Works

The Radiant Panel Association illustrates six ways to install radiant floor heating in your home.

  1. Concrete Slab

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    Concrete Slab

    Tubing or electric heating elements are attached to wire mesh or fixtures to hold them in place until the concrete floor is poured. The tubing or elements are embedded in the concrete anywhere from the bottom of the slab to within 2 inches of the surface, depending on the design and installation technique.

    Radiant Panel Association

  2. Slim Slab

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    Slim Slab

    Tubing or electric heating elements are attached to the wood subfloor with fasteners to hold them in place until a concrete, lightweight concrete, dry pack or gypsum underlayment is installed as the final subfloor. Gypsum products bond to the subfloor and are generally thinner and lighter than concrete products. Concrete must be separated from the subfloor with a slip sheet to prevent bonding. The subfloor structure be built to minimize flexing to avoid cracking the slab.

    Radiant Panel Association

  3. Subfloor Plates

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    Subfloor Plates

    Aluminum plates supported by wood or plastic spacers contain channels which accept tubing. These plates spread the heat uniformaly beneath the finished floor. 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.

    Radiant Panel Association

  4. Subfloor Boards

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    Subfloor Boards

    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.

    Radiant Panel Association

  5. Engineered Subfloor

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    Engineered Subfloor

    An engineered, load bearing board takes the place of the structural subfloor. It has a laminated layer of aluminum and a channel to accept tubing. 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.

    Radiant Panel Association

  6. Staple-Up

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    Staple-Up

    Tubing is attached to the underside of the existing subfloor. Aluminum plates can be used to spread the heat evenly under the subfloor. Insulation is placed in the joist space beneath the tubing. A two-inch air space is usually left between the insulation and the bottom of the subfloor. If aluminum plates are used which significantly cover the underside of the subfloor, the insulation may be pushed up tight against the plates. Obviously, care must be taken when nailing any floor covering from above.

    Radiant Panel Association

  7. Hanging in Joist Space

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    Hanging in Joist Space

    Tubing is suspended several inches beneath the subfloor in the joist space. Insulation is installed in the joist space beneath the tube with a 2 to 4 inch air space between the top of the insulation and the bottom of the subfloor. The air within this space is heated by the tube which, in turn, heats the underside of the subfloor.

    Radiant Panel Association

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