Gauged Porcelain Tile Panels/Slabs Trends Gauged porcelain tile panels/slabs (GPTP) are gaining a lot of traction in the tile and stone industries as of late. The large-format materials, which are technically defined as tiles measuring 1 x 1 meter (40 x 40 inches) or larger, have been around for almost 10 years now, but have been creating a lot of buzz in the marketplace over the last handful...