Will Excessive Water Make Ceramic Tiles Loose?

Water Absorption Rates

• Ceramic tile's water absorption rate depends on the raw materials used in the actual tile and during manufacture. According to the Tile Council of North America, water absorption determines tile classification. Ceramic tiles for walls may have high water absorption rates, between 7 and 20 percent, with certain tiles as high as 30 percent. Water goes into the tile body during rain and snow if used outside. The tile expands during freezing temperatures and may crack. Even if you live in a warm climate, take care when choosing outside tile if the temperature ever goes below freezing.

Glazed Ceramic Tile

• Also known as vitreous tile, glazed ceramic tile includes a thin layer of liquid glass placed on it before baking in a kiln. While this glazing allows for countless colors and patterns, it also makes the tile somewhat slippery and is not generally recommended for flooring. This type of tile is often used for walls and countertops. Glazed ceramic tile is usually very dense, permitting little or no water absorption. Excessive water should not damage glazed ceramic tiling.

Tile Ratings

• Ceramic tiles are rated by the International Standards Organization, so the ratings hold true throughout the world. Choose the right-rated tile for your use. A zero rating indicates a decorative-only tile; 1 is for no-foot traffic, which may be used on walls; 2 is for light traffic areas; 3 is for interior residential rooms; 4 is for light commercial use; and 5 is for very heavily trafficked areas. For outdoor use where water damage may occur, choose a 4 or 5 rating.

Porcelain Tiles

• Porcelain tiles have a water absorption rate of less than 1 percent. These tiles differ from ceramic tiles in that they originate from porcelain clays and are produced by the dust-press method. Red or white clays are used for ceramic tiles. Both ceramic and porcelain tiles are kiln-fired. Considered impervious, porcelain tiles make a good choice for installation in any area where excessive water might be a problem. Most tile dealers carry ceramic and porcelain tiles. Choose from unglazed, glazed or matte finishes.