![]() ![]() If you are using a very low temperature heat source, such as a geothermal heat pump, then you should be using the mesh or re-rod method and pulling the grid to the center of the slab during the pour. Care should be taken to insure that the tubing is clear of any sharp edges to avoid damage. Tubing can be stapled to the foam board with plastic foam board staples or tied to re-rod or wire mesh. ![]() Expanded polystyrene “bead board” is to be avoided as it is susceptible to insect damage. Extruded polystyrene foam board with a 25 psi minimum compressive strength is typically used for floors. Heat comes off of the tubing in all directions, so proper insulation helps drive the heat up and into the conditioned space. State energy code dictates the r-value of the under slab and edge insulation. A vapor barrier works to prevent the water from reaching the bottom of the slab. Ground water can wipe BTUs away from the heated slab. Let’s look at the differences between a radiant concrete slab and a suspended floor.įor a radiant concrete slab, the first item we install is the vapor barrier. When installing a radiant heating system, the type of floor you are using will determine the method used to install it. ![]()
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January 2023
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