Hanging in Joist Space - Radiant Floor Heating: How It Works - Bob Vila
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Radiant Panel Association
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.