Electric radiant heating is fairly common in bathroom floors, especially those with ceramic or marble tile. There are electric radiant products that can be installed below almost any floor, including hardwood and carpet. Wires can be laid in tracks that hold them in place until the concrete or mortar is poured. There are also premanufactured sheets, called matting, that can be laid on the floor before the mortar and tiles are laid.
Some systems put the wires in the actual underlayment to be installed beneath a floating floor system. Others systems place the individual wires or mat material on the sub-floor where a shallow coat of thin set or floor leveler is poured. Underlayment and floor planks are installed above it. Glue at the joints of the floor planks is recommended if the locking system alone cannot hold the floating floor in place. Nails can damage the wires and are not recommended.