The covering to be used on a given wall or floor must serve tow functions: one is an aesthetic function, as a design element; another is a technical function, as a construc-tion material capable of withstanding a range of environmental stresses without breakage or wear.
These two functions are basic and essential; both are indispensable .
The buyer/user know that both these functions can be served , in theory at least, by various types of surface coverings. We say "theoretically", since in general there are a variety of practical and economic options to choose form. In specific cases, though, the number of alternatives is much smaller, and sometimes only one material is technically suitable and economically advantageous.
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