Large-format tile is defined as any tile with at least one side longer than 15 inches, though many commercial panels now exceed 48 inches. Working with these units poses unique challenges, primarily regarding substrate flatness. Because the surface area of each tile is so large, even minor deviations in the concrete floor can result in significant 'lippage'—where one edge of a tile sits higher than the next—which creates both a trip hazard and a surface prone to chipping. Industry standards like those published by the TCNA require a very high level of substrate tolerance, often necessitating self-leveling underlayment to achieve the required flatness. Furthermore, achieving sufficient mortar coverage is more difficult with large units. Installers must use proper trowel sizes and back-buttering techniques to ensure that at least 80 percent to 95 percent of the tile's back is covered in mortar, depending on the exposure. Large tiles also expand and contract more as a single unit, making the correct placement of movement joints (soft joints) mandatory to prevent the floor from tenting or cracking due to structural stress. When specifying large-format tile, it is essential to involve a qualified installer who has the specialized tools, such as suction-cup handling systems and leveling clips, necessary to handle these units safely. Proper planning of the layout and the use of the correct ANSI-compliant mortar are the two most important factors in ensuring a successful installation.
Key considerations
- large format commercial tile, commercial large porcelain tile, installing large tile in commercial spaces
- large-format tile, porcelain tile, commercial tile
- heavy traffic, layout stability, cleanability
- fewer grout joints, large modules, continuous appearance