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Nominal size is defined in ANSI A137.1 Specification for Ceramic Tile as, “the approximate facial size or thickness of tile, expressed in inches or fractions of an inch (or in centimeters or millimeters) for general reference.” In other words, nominal size is the generic tile size which is usually noted on the tile box or on product data sheets. Typical nominal sizes are 8″x 8″, 12″x 12″, 16″x 16″, 24″ x 24″, etc.

The ANSI A138.1 standard for sustainable tiles and tile installation materials establishes criteria for products throughout their full life cycle. Over the past several blog entries, we’ve reviewed the first four sections of the standard. This time, we’ll have a look at the fifth and final section, Innovation.

Caliber range is defined in ANSI A137.1 Specification for Ceramic Tile as, “an acceptable size range for tiles to be used in the same installation.” In other words, this is what determines how much size variation can exist between tiles on the same job. This is important as it relates to whether or not the layout of an installation looks good with even joints throughout.