A heating wire support meshing and a method of constructing a heated surface, particularly a floor surface therewith, is described. The heating wire support meshing comprises one or more mats formed by transversely spaced parallel rows of wire support bridge elements interconnected together at their crossings. The bridge elements have electric heating wire support slots to receive and guide one or more electric heating wires along one or more desired paths. Bottom support formations extend along a bottom planar surface of the mat. Top support formations lie in a top planar surface of the mat. The wire support slots are adapted to support the one or more electric heating wires spaced below the top support formations. The support meshing also acts as a reinforcement of a sub-floor on which the support meshing is installed.