Glazed tiles are laid with spaces or grouted joints between them and so this variation is taken up in these grout joints.
Vitrified, porcelain, or full bodied tiles are 'rectified' in the factory. After firing, these unglazed tiles are fed through a machine that actually cuts or grinds the tiles to size. These tiles have very small tolerances in size variation. Of course, from time to time, a malfunction in the sorting process may allow tiles to be packed with an overly generous variation in size.
Tiles shrink during manufacture, and that shrinkage can vary from tile to tile. The industry standards, both Australian and European, ensure that the variation is kept to an acceptable level.
For example, a tile 300mm x 300mm is allowed to vary in size up to 2.25mm either side of the work surface. This means that the tiles can be 297.75mm to 302.25mm and still be within the standard.
Try not to worry! If you have a tiler they will tell you if the tiles vary to much in size. To satisfy your curiosity, you can lay a box full of tiles of the floor and see for yourself how the size variation can be taken up.
If you still think that your delivery of tiles has too much variation in size, take a box back to the Beaumont Tiles store where you purchased them. Our friendly staff will check the variation, and also, call through to the tile warehouse to see if that variation is indicative of the rest of the stock.
If we have stock that is more dimensionally accurate, we can then arrange to swap your order over.
It is important to look over your tiles before tiling to check for imperfections and size issues, unfortunately once tiles are laid we cannot offer a replacement or refund