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An underlayment heating system for use with flooring, the system including an underlayment layer, a vapor barrier layer, a thin film radiant heater layered between at least part of the underlayment layer and the vapor barrier layer, wherein the thin film radiant heater includes a substrate, a conduc

An underlayment heating system for use with flooring, the system including an underlayment layer, a vapor barrier layer, a thin film radiant heater layered between at least part of the underlayment layer and the vapor barrier layer, wherein the thin film radiant heater includes a substrate, a conductive resistive ink pattern disposed on the substrate, wherein the ink pattern generates heat when electricity passes through the resistive ink pattern, wherein the underlayment heating system includes overlap portions that extend along opposing longitudinal edges of the system, and wherein the thin film radiant heater is layered between the underlayment layer and the vapor barrier layer such that the resistive ink pattern is disposed outside of the overlap portions of the underlayment heating system.

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1. An underlayment heating system for use with flooring, the system comprising: an underlayment layer;a vapor barrier layer;a thin film radiant heater layer positioned between at least part of the underlayment layer and at least part of the vapor barrier layer, wherein the thin film radiant heater l

1. An underlayment heating system for use with flooring, the system comprising: an underlayment layer;a vapor barrier layer;a thin film radiant heater layer positioned between at least part of the underlayment layer and at least part of the vapor barrier layer, wherein the thin film radiant heater layer comprises: a substrate;a conductive resistive ink pattern disposed on the substrate, wherein the ink pattern generates heat when electricity flows through the resistive ink pattern;wherein the underlayment layer includes a first overlap portion and the vapor barrier layer includes a second overlap portion, the first overlap portion and the second overlap portion extending along opposing longitudinal edges of the system such that the first overlap portion is configured to extend underneath a first adjacent underlayment heating system and the second overlap portion is configured to be placed over a vapor barrier layer of a second adjacent underlayment heating system, andwherein the thin film radiant heater layer is positioned between the underlayment layer and the vapor barrier layer such that the resistive ink pattern is disposed outside of the first overlap portion and the second overlap portion. 2. The underlayment heating system of claim 1 further comprising a pressure sensitive adhesive strip disposed on the vapor barrier layer and configured to bond the vapor barrier layer with a second overlap portion of the first adjacent underlayment heating system. 3. The underlayment heating system of claim 1 further comprising at least one of pressure sensitive adhesive and heat activated adhesive to bond the thin film radiant heater to the vapor barrier layer and the underlayment layer. 4. The underlayment heating system of claim 1 wherein the vapor barrier is made from at least one of polyethylene and treated paper. 5. The underlayment heating system of claim 1 wherein the resistive ink pattern comprises: a pair of longitudinal bus stripes spaced apart from each other; anda plurality of transverse stripes spaced apart from each other and extending between and electrically connected to the pair of longitudinal bus stripes. 6. The underlayment heating system of claim 1 wherein: the thin film radiant heater further comprises a pair of longitudinally extending busses made of an electrically conductive metal; andthe resistive ink pattern comprises a plurality of transverse stripes spaced apart from each other, extending between the longitudinally extending busses, and electrically coupled to the pair of longitudinally extending busses. 7. The underlayment heating system of claim 1 further comprising a controller configured to control the flow of electricity to the thin film radiant heater as a function of at least one of air temperature and floor temperature. 8. The underlayment heating system of claim 1wherein a transverse measurement of the second overlap portion is greater than a transverse measurement of the first overlap portion. 9. The underlayment heating system of claim 1 further comprising an electrical connector connected to the thin firm radiant heater. 10. The underlayment heating system of claim 1 wherein the resistive ink is configured such that, as the temperature of the resistive ink increases, the resistance of the ink increases. 11. A heated flooring system comprising: a plurality of underlayment heating systems disposed on a subfloor in a partially overlapping arrangement, wherein each underlayment heating system includes: an underlayment layer;a vapor barrier layer;a thin film radiant heater layer positioned between at least part of the underlayment layer and at least part of the vapor barrier layer, wherein the thin film radiant layer heater comprises: a substrate;a conductive resistive ink pattern disposed on the substrate, wherein the resistive ink pattern generates heat when electricity flows through the resistive ink pattern; andwherein the underlayment layer includes a first overlap portion and the vapor barrier layer includes a second overlap portion, the first overlap portion and the second overlap portion extending along opposing longitudinal edges of the system such that the first overlap portion is configured to extend underneath a first adjacent underlayment heating system and the second overlap portion is configured to be placed over a vapor barrier layer of a second adjacent underlayment heating system, andwherein the thin film radiant heater layer is positioned between the underlayment layer and the vapor barrier layer such that the resistive ink pattern is disposed outside of the first overlap portion and the second overlap portion. 12. The heated flooring system of claim 11 wherein each underlayment heating system further includes a pressure sensitive adhesive strip disposed on the vapor barrier layer and configured to bond the vapor barrier layer with a second overlap portion of the first adjacent underlayment heating system. 13. The heated flooring system of claim 11 wherein each underlayment heating system further comprises at least one of pressure sensitive adhesive and heat activated adhesive to bond the thin film radiant heater to the vapor barrier layer and the underlayment layer. 14. The heated flooring system of claim 11 wherein the vapor barrier is made from at least one of polyethylene and treated paper. 15. The heated flooring system of claim 11, wherein the pattern of conductive resistive ink comprises: a pair of longitudinal bus stripes spaced apart from each other; anda plurality of transverse bars spaced apart from each other and extending between and electrically connected to the longitudinal bus bars. 16. The heated flooring system of claim 11, wherein: the thin film radiant heater further comprises a pair of longitudinally extending busses made of an electrically conductive metal; andthe resistive ink pattern comprises a plurality of transverse stripes spaced apart from each other, extending between the longitudinally extending busses, and electrically coupled to the pair of longitudinally extending busses. 17. The heated flooring system of claim 11 further comprising a controller configured to control the flow of electricity to the thin film radiant heater as a function of at least one of air temperature and floor temperature. 18. The heated flooring system of claim 11wherein a transverse measurement of the second overlap portion is greater than a transverse measurement of the first overlap portion. 19. The heated flooring system of claim 11 wherein the thin film radiant heater further comprises an electrical connector connected to the thin film radiant heater. 20. The heated flooring system of claim 11 wherein the resistive ink is configured such that, as the temperature of the resistive ink increases, the resistance of the ink increases.