Slim Slab - Radiant Floor Heating: How It Works - Bob Vila
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Radiant Panel Association
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.