Tile terminology can be confusing. Most types of tiles that are made from clay or a mixture of clay and other materials, then kiln-fired, are considered to be a part of the larger classification called “Ceramic Tiles”. These tiles can be split into two groups, porcelain tiles and non-porcelain tiles. These non-porcelain tiles are frequently referred to as ceramic tiles by themselves, separate from porcelain tiles.

“Ceramic” or non-porcelain tiles are generally made from red or white clay fired in a kiln. They are almost always finished with a durable glaze which carries the color and pattern. These tiles are used in both wall tile and floor tile applications, are softer and easier to cut than porcelain, and usually carry a PEI 0 to 3 rating. Non-porcelain ceramic tiles are usually suitable for very light to moderate traffic and generally have a relatively high water absorption rating making them less frost resistant and they are more prone to wear and chipping than porcelain tiles.

Porcelain tile is a tile that is generally made by the dust pressed method from porcelain clays which result in a tile that is dense, impervious, fine grained and smooth, with a sharply formed face. Porcelain tiles usually have a much lower water absorption rate (less than 0.5%) than non-porcelain tiles making them frost resistant or frost-proof. Glazed porcelain tiles are much harder and more wear and damage resistant than non-porcelain ceramic tiles, making them suitable for any application from light traffic to the heaviest residential and light commercial traffic. Full body porcelain tiles carry the color and pattern through the entire thickness of the tile making them virtually impervious to wear and are suitable for any application from residential to the highest traffic commercial or industrial applications. Porcelain tiles are available in matte, unglazed or a high polished finish.

Glazed tiles are coated with a liquid glass, which is then baked into the surface of the clay. The glaze provides an unlimited array of colors and designs as well as protects the tile from staining. The unglazed tiles are pretty much the same as the glazed tile, except that their surface is not coated. Full-body porcelain tiles do not show wear because their color extends throughout the tile, making them ideal for commercial applications.

Yes, but this depends heavily on the installation. To optimize durability, the subfloor or base on which the tiling will be glued must be flat, stable, and without irregularities. Depending on the dimensions of each tile, the proper mortar must be used. For larger pieces, manufacturers recommend double gluing on the subfloor and the back of the tile. Generally, carefully following the manufacturers' recommendations is always the best thing to do.

Rectified tiles go through a cutting process called grinding, which trims all pieces to the same exact size. As a result, seating joints can be minimal, reducing the amount of grout and making the assembly more aesthetically pleasing.

Wall tiles (because they are not intended to be load bearing) are typically thinner, lighter and softer than floor tiles. Wall tile glazes are not designed to handle the abrasive forces from foot traffic. Increasingly, floor tiles are being applied to walls and this is no problem so long as the walls are strong enough to support their weight and proper ceramic tile installation methods are used. However, it is not usual to recommend using wall tiles in floor applications.