As a trusted and reputed stacked stone manufacturer, GloRem advises our customers to use a polymer modified tile thin-set. You have to ensure that it complies or surpasses the best standards in the industry. The most accepted norms are ANSI 118.11 and ANSI 118.4 adhesion standards. Prior to deciding on the right adhesive product, you should evaluate the weight of the natural stone cladding carefully.