This study has been made to determine the main factors related to deterioration during the service period of buildings by analyses of separation failures and fall-off accidents of actual exterior wall ceramic tile coverings which had been installed by the manual method and the prefabricated form tile installation method. The important factors closely related to the detached failures of ceramic tile coverings applied by the manual method were the shapes and sizes of lugs at the back of tiles providing mechanical bond between tiles and bedding mortar, and the derection in which the tiled walls faced.
