Water Jet System For Preparing External Wall Surface Repainting Takashi Nireki*1　Tatsuo Inukai*2　Kenji Motohashi*3 Teruo Kondo*4　Terusato Inoue*5 キーワード External wall surface, Recoating, Repainting, Surface preparation, Water jet 概要 Surface treatment or preparation work on external walls is a key factor to achieving the required level of performance for repainting or recoating work. A Water Jet System (WJS) enable this surface treatment to be more effectively carried out. This paper describes the results of several experimental approaches and some 50-site investigations on the use of WJS. These studies formed the basis for deriving the specifications and operation manual for the effective use of WJS in repainting work. *1　Tsukuba Building Test Laboratory, Center for Better Living, Director *2　Tsukuba Building Test Laboratory, Center for Better Living *3　Building Research Institute, Dr. Eng. *4　Technology Development Division, Shimizu Corporation, Dr. Eng. *5 Kowa Chemical Co. Ltd., CIB　W70，pp.267-274，November 1998