When you’re choosing tiles, it’s important to consider how hard-wearing different tiles are. The PEI rating measures how easily the surface of a tile will scratch, so it’s a good way to determine how durable your tiles will be. There are six PEI ratings, from 0 to 5: Tiles rated PEI 0 are for wall use only. Tiles rated PEI 5 are very tough, and can be laid over commercial floors. For further information, please read our guide to the PEI Rating.