The traditional Mexican roof tiles are generally made from locally available materials such as clay, terracotta or slate. Modern materials such as concrete, metal and plastic are are sometimes used but not in Valle de Bravo. Interestingly "tejas" is the word that ultimately was mis-spelled and slightly mis-pronounced to become the name for the State of Texas.
There are different methods of installation. We're using the free-form method of installation where the tiles are held in place by their own weight with the exception of concrete on the sides (to protect the wood from water) and the peak of the roof for a good waterproof seal there.
With other methods of installation, the roof tiles are 'hung' from the framework of a roof by fixing them with nails or screws. There are also roof tiles for special positions, particularly where the planes of the several pitches meet. They include ridge, hip and valley tiles. These can either be bedded and pointed in cement mortar or mechanically fixed. But the traditional building approach creates these specialty tiles by chipping pieces from the regular roof tiles.
Similarly to roof tiling, tiling has been used to provide a protective weather envelope to the sides of timber frame buildings. These are hung on laths nailed to wall timbers, with tiles specially molded to cover corners and jambs. Often these tiles are shaped at the exposed end to give a decorative effect. Another form of this is the so-called mathematical tile, which was hung on laths, nailed and then grouted. This form of tiling gives an imitation of brickwork and was developed to give the appearance of brick, but avoided the brick taxes of the 18th century.
Slate roof tiles were traditional in some areas near sources of supply, and gave thin and light tiles when the slate was split into its natural layers. It is no longer a cheap material, however, and is now less common.
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