The purpose of this paper is to clarify seismic safety of ALC curtain wall under severe earthquake ground motion, and seismic deformation tests were performed about critical differential movements of the ALC curtain wall and fall-off capacity of tiles. In addition, adhensive strength test and a deformational performance test were conducted to compare normal tiling system and R-tile system which is supported of metal and mortar for renewals of external walls. As a result, the tile did not fall-off though adhesive strength of the tile was small inthe R-tile system. Therefore, it is thought that R-tile system can be used as a tiling system for renewals of external walls.
