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The National Tile Contractors Association (NTCA) is a nonprofit trade association dedicated to the professional installation of ceramic tile and natural stone, established in 1947. [1] The NTCA aims to improve the industry through education and training, participation in the development of standards and methods.
Some states may require a written examination for a license, while others may require several years of field experience as a student or intern, or both. The requirements regarding who must be licensed may include uncommon or strange licenses; for example, four states require licensing for interior designers. [4]
Ceramic tiles are set in beds of mortar or mastic with the joints between tiles grouted. Varieties of ceramic tiles include quarry tile, porcelain, and terracotta. Many different natural stones are cut into a variety of sizes, shapes, and thicknesses for use as flooring. Stone flooring uses a similar installation method to ceramic tile.
In the United States, licenses are typically issued by state agencies, whereas certifications are usually awarded by professional societies or educational institutes. Obtaining a certificate is voluntary in some fields, but in others, certification from a government-accredited agency may be legally required to perform certain jobs or tasks.
The history of thinset dates back to the post-World War II era when the tile industry sought more efficient methods for tile installation. [7] Before thinset, the standard method for installing tiles was the thick-set or mud-set method, which involved a thick layer of a sand and cement mixture.
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Specialized cement is necessary for installation of porcelain tiles, and in the US specifications, are set by the Tile Council of America [2] and supported by the Tile Contractors Association. Porcelain, being denser and heavier than ordinary ceramic tiles, needs a stronger adhesive to hold the weight on walls.