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Electric radiant floor warming con- tinues to be a growing trend in the tile and stone industry. There are multiple detailsmethods in the TCNA Handbook for Ceramic Glass and Stone Tile Installation that relate to electric floor warming such as RH115A RH116A RH130 RH135 RH140 and more. Here are some basics to begin with heat energy emitted from an electrically warmed floor warms people and other objects in the room rather than directly heating the air within that space. Because of this the temperature of the internal air within radiant-heated spaces is generally lower than spaces heated via conven- tional methods. Yet the same degree of body comfort is achieved so the temperature perceived by those in the room is actually the same. As a result the amount of electricity used to warm a room equipped with radi- ant floor warming is much less than one would expect making the system very energy efficient. Electric floor warming is designed to be installed directly under the tile or stone flooring for both new construction or remodeling projects. Installers may simply thin-set this material down to the substrate while adding virtually no height to the floor roughly 18 3mm. The installation of an electric in-floor warming system does not require any special tile installation procedures. The substrate subfloor should be prepared as for any con- ventional tile installation according to applicable standards. Very impor- tantly it should be clean of any debris or sharp objects that could damage the heating element. The heating system should be installed over a smooth and even surface. Concrete mortar beds exterior glue plywood existing ceramic tile and stone cement terrazzo and cement backer board provide ideal substrates for electric radiant floor warming BY T HE BOOK brought to you by By Arthur Mintie senior director Technical Services LATICRETE International Inc. Electric oor warming 94 TileLetter May 2016