Tile is rated using a grading system and is solely based on the tile’s durability and resistance to surface damage. An easy way to think of it is that a rating or grade 1 means that the tile is more likely to be prone to scratches and or dents where as a grade 5 is considered a more durable tile and resistant to surface damage.
Here is a breakdown of all 5 rating levels and their suitable applications:
No foot traffic. These tiles should be used for walls only.
Light traffic. Good for interior residential and commercial walls. These are for areas where little abrasion occurs, like bathrooms!
Light to moderate traffic. Use these in residential settings with normal foot traffic. They are also great for countertops and walls.
Moderate to heavy traffic. These tiles are acceptable for all home spaces, in addition to medium commercial spaces.
Heavy to extra heavy foot traffic. Approved tile for all residential applications and heavy commercial spaces.