Should you insulate between an existing concrete slab & your new Electric Radiant Floor Heating System?
Many contractors & homeowners think so. Insulation is not REQUIRED, but many customers like to install a "thermal break" while they are installing new floor heating. Heat goes to cold, so warm objects or surfaces transfer heat to cold ones. An Insulating material on top of the slab and under the Electric Radiant Floor Heat elements will slow the transfer of heat from the heating elements into the slab and effectively decrease the time it takes your floor warming system to warm your floor.