Large format tile installation requires particular attention to proper substrate preparation, grout joint sizing, trowel selection, and mortar coverage. It is critical that large format tile be installed on a level substrate. Additionally, there must be at least 90% mortar contact and a minimum grout joint of 3/16". Refer to the published installation instructions prepared by your preferred manufacturer of setting materials for optimal tools and setting methods to achieve your desired result.
For proper bonding, medium bed mortar should be used in installing tiles with a dimensional length greater than 20" x 20", large rectangles or tiles with greater dimensional thickness than normal. Back buttering tiles of this nature in the installation process will also assure proper coverage for body.