Tile that experiences much foot traffic should be harder and denser than than that receives no foot traffic. Tile installed on a wall receives no foot traffic and, in fact, almost no wear of any kind.
PEI = Porcelain Enamel InstituteThe Porcelain Enamel Institute, headquartered in Norcross, GA, is "dedicated to advancing the common interests of porcelain enameling plants and suppliers of porcelain enameling materials and equipment," according to its website. The PEI has been representing the interests of porcelain enamellers since 1930.
PEI Ratings: From One to Five
- PEI Class 1 Rating: No foot traffic. Wall use only in residential and commercial applications.
- PEI Class 2 Rating: Light traffic. Both wall use and bathroom floor applications.
- PEI Class 3 Rating: Light to moderate traffic. Countertops, walls, and floors for normal foot traffic.
- PEI Class 4 Rating: Moderate to heavy traffic. All residential applications as well as medium commercial and light institutional.
- PEI Class 5 Rating: Heavy to extra heavy traffic. All residential and heavy commercial and institutional foot traffic.