What is meant by the term calibration when used by tile manufacturers to refer to tile sizes?
Although a tile size may be stated as 30cm x 30cm the nature of the manufacturing process means that it is impossible to ensure all tiles are of an equal size. It is for this reason that tile manufacturers produce a number of calibrations for the same tile. The specific calibration provides an indication of the variance from the stated size of the tile. When calibrations are indicated at the outset of a project, the tiles will be as close to a uniform size as you are ever likely to achieve. If this is not done however, there can be problems with the grout lines not running straight as a result of the variance in the tile sizes used.
