
When used as exterior tiling, it can only be used in very mild climates, as harsh weather can damage the tile, it needs almost annual upkeep. Therefore, it is very rarely used for outdoor purposes these days, though in very warm climates like the Gulf coast of Florida, well maintained and sealed Saltillo tile makes for a nice tile flooring option for a patio. Typically, Saltillo tiles should be sealed after they have been installed and are completely dried and clear of extra dirt and debris and annual upkeep is highly recommended for exterior applications.
Since humidity has a definite effect on whether or not the white salt spots appear on exterior Mexican tile, it can be assumed that efflorescence is a seasonal problem. The intensity of efflorescence increases after rainy winter seasons, decreases in spring, and by summer has practically disappeared.
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