Certified Porcelain Tile Labeling – a Game of Branding.
For St. Lucie County homeowners, the “Certified Porcelain Tile” labeling on a box of tile certifies little of particular value.
That label insures only that the tile has been tested by the American Society for Testing and Materials (ASTM) and the tile has a water absorption rate of 0.5% or less. The label insures nothing more that that. As St. Lucie County’s temperature almost never gets below freezing, that certification is of no value for any tile installation done here, either indoors or outdoors.