The Importance of Insulation

Adding insulation both under the slab and near its exposed edges reduces heat loss into the ground and allows the slab to heat more quickly, which lowers total operating costs. "We always insulate the substrate because it helps the system heat more efficiently," says Blackburn. "If we don't, the user has to operate the system at a higher wattage per square foot."

Many manufacturers of snow melting systems recommend insulating the slab with rigid polystyrene foam 1 to 2 inches thick. But both Blackburn and Bailey prefer to use reflective insulation consisting of a layer of aluminum foil sandwiched between two layers of polyethylene bubbles. Bailey uses a product manufactured by Covertech Fabricating. Its only about 5/16-inch thick and can also serve as a vapor barrier. "The thickness of foam board can a problem in a slab thats only 4 to 5 inches thick," says Bailey. And if the foam is not placed on a perfectly level sub-grade, it can crack, diminishing its insulation value. Supplied in rolls, the reflective insulation also is easier for workers to carry and install.

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