The author's previous experimental study (T. Nishiura, Conservation of old roof tiles for reuse in the Conservation of Stone II, Centro Cesare Gnudi, Bologna, (1981) 699-709, see AATA 20-768) proved that old roof tiles are very well preserved by impregnation treatment with a methyl tri-ethoxy silane solution (SS-101). This technique was practically applied for the first time to the actual historic building, Joko-temple Kannondo. On this occasion, the restoration of the partially broken decorative eave roof tiles (Tomoe Gawara) was also carried out using specially prepared epoxy putties to replace losses in the original tiles. The outline of these treatments is as follows; (1) Consolidation of the old plain roof tiles: The air-dried old roof tiles were immersed in SS-101 for two hours and then dried in air for three weeks. 300 old roof tiles were treated, and 256 of them were reused, representing about 15% (254 out of 1728 tiles) of all plain roof tiles. 30 of the other treated roof tiles were tested at the Tokyo National Research Institute of Cultural Properties. (2) Restoration of the partially broken decorative eave roof tiles: For the preliminary test, some kinds of artificial roof tile were examined as to workability, appearance and durability. The following two combinations were considered most suitable: A) Epoxy resin 100 parts, Powder of rooftile 30 parts, Glass micro balloon 40 parts, Pine carbon black (a proper dose); B) Epoxy resin emulsion 100 parts, Powder of roof tile 100 parts, Glass micro balloon 8 parts, Pine carbon black (a proper dose). Using A for filling up the simple missing parts and B for shaping the decorative losses, eight decorative eave roof tiles were restored in the laboratory of the Tokyo National Research Institute of Cultural Properties, and were then reset on their original positions.