The difference between wall and floor tiles is actually quite simple. You can use floor tiles on the wall, but not on the floor. Wall tiles are thinner and less strong than floor tiles. This is partly due to the wear value of tiles.
Less intensive use
Wall tiles do not have to have such a high wear value as floor tiles, because you do not walk on wall tiles. These tiles are therefore used a lot less intensively and no sand or the like will rub over them.
Ceramic wall and floor tiles can be divided into rectified and non-rectified tiles. You should pay attention to this when you buy tiles, because this has an effect on the end result.
Cut to size
Rectified tiles have clean, straight and cut-to-size edges and corners. After the firing process, the tiles are cut to size again. This ensures that the tiles are dimensionally stable. This has the advantage that tiles can be placed closer together and a minimal joint is possible. This will give you a tighter end result.
To indicate whether a tile has been rectified, there is often an 'R' or 'Rett' after the format or on the packaging. A 60 x 60 tile that has been rectified often has the following size: 59,2 x 59,2 centimeters. So if it is not clear, you can also see whether a tile has been rectified or not based on the format.
Non-rectified tiles are therefore less dimensionally stable.
The wear resistance of the surface of ceramic tiles is measured with the PEI (Porcelaine Enamel Institute) standard. It indicates in which wear class the tile falls and how well a tile is resistant to scratching dirt. The PEI value in tiles is examined by means of a tester, which runs over the surface of the ceramic tile with a rotating gear wheel. Using steel balls and aluminum powder as an abrasive, it is determined after how many revolutions there is visible damage. Based on this research, ceramic tiles can be divided into five different classes.
PEI 1: These tiles are the most sensitive and suitable for places where people always walk without shoes. For example, consider a bedroom. You can also use these tiles as wall tiles. > 600 revolutions
PEI 2: Applicable in places where people walk with soft footwear, with minimal presence of scratching dirt. > 900 revolutions
PEI 3: Suitable for normal use and footwear, with minimal amount of scratchy dirt. These tiles are, for example, very suitable for the hall or kitchen. > 1200 revolutions
PEI 4: Can be used in heavily trafficked areas and dirt. For example, think of catering establishments and showrooms. > 1500 revolutions
IEP 5: Tiles of this class are suitable for very intensive use for indoor and outdoor use. These tiles are also frost-resistant: so they can be used on a terrace or garden. >10.000 revolutions