This mission was built using adobe, sun-dried blocks made from mud and straw. Clay tiles were added for roofs. They protected the mud walls from rain which would cause significant damage. The adobe bricks were not fired like the roof clay tiles and weren't very durable. The clay roof tiles also helped during attacks from the natives. When the first adobe structures were built, they had thatch roofs made from plants. Flaming arrows burnt down to the ground several mission buildings along the Camino Real. Clay tiles solved that problem.
Building supply
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