What “large-format” actually means
Anything with a side longer than 15 inches is considered large-format, but the most common sizes we install are 12x24, 24x24, 24x48, and slab-sized panels for accent walls and showers.
What large-format demands from the substrate
Large-format tile is unforgiving on uneven floors. The bigger the tile, the more obvious any high or low spot becomes. We check flatness with a long straightedge and use self-leveling or shimming as needed before any tile is set.
Layout and grout
Most large-format installs use a 1/3 offset or straight stack rather than 50% offset, which can cause lippage. Grout joints are sized to the manufacturer’s spec.