Interior walls should be installed on cement board or exterior grade plywood using a polymer modified mortar following the manufacturer’s guidelines for trowel use and mortar recommendations.
Set The Tile
Stacked stone is similar to installing wall tile except in some cases no grout joints are required. Apply the appropriate adhesive for the product you are using and set the stones. If you are tiling a corner, some manufactures offer pre-made corners. Another option is to overlap and intertwine the stones.
A properly prepared wall will help achieve the best results.