Why does the tile overage default to 15%?

Industry standards suggest adding at least 15% overage due to tile cuts, potential breakage, or future repairs.

Industry standards suggest adding at least 15% overage due to tile cuts, potential breakage, or future repairs. There is always the potential of breakage during moving and shipping tiles (2%-4%). We highly recommend having additional tiles for making tile cuts during your installation and to store for possible future plumbing (or other construction) repair needs. For many of our tiles, there is color variation from batch to batch so if you need more tile in the future it may not match your current tile.