The layers in this assembly are predictable: structural sheathing material covered with tar paper, clay tile, dirt, and a few weeds. The dirt and weeds soak up much of the rain. Any water that gets past the soil drains down the tar paper and off the roof.
— Fernando Pagés Ruiz is ProTradeCraft's Latin America Editor. He is currently building a business in Ecuador and a house in Mexico. Formerly, he was a builder in the Great Plains and mountain states. He is author of Building an Affordable House and Affordable Remodel (Taunton Press).