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In page Spanish missions in California:

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Each mission had to fabricate virtually all of its construction materials from local materials. Workers in the carpintería (carpentry shop) used crude methods to shape beams, lintels, and other structural elements; more skilled artisans carved doors, furniture, and wooden implements. For certain applications bricks (ladrillos) were fired in ovens (kilns) to strengthen them and make them more resistant to the elements; when tejas (roof tiles) eventually replaced the conventional jacal roofing (densely packed reeds) they were placed in the kilns to harden them as well. Glazed ceramic pots, dishes, and canisters were also made in mission kilns.[citation needed]