If you peel back the red tiles on a roof, the roofing system below has several parts. 1. The roof deck: The deck is the structural wood base of the roof, usually plywood or oriented strand board. It gives the tile roof the solid support needed to carry the weight of the roof. 2. The underlayment: The underlayment is the waterproof layer installed over the wood deck. It may be asphalt-saturated felt or a modern synthetic membrane. This is the layer that keeps water from reaching the structure. 3. Battens: Battens are small wood or metal strips fastened across the roof. Some tiles hang from these strips with lugs on the underside. Other roofs use fasteners that secure the tile more directly. 4. Flashing: Flashing is sheet metal installed at valleys, edges, walls, chimneys, vents, and other roof penetrations. It channels heavy water flow away from vulnerable areas. 5. The tiles: Clay or concrete tiles are the visible armor of the roof. They take sun, wind, and rain. They shed most of the rainwater, while the underlayment catches moisture that gets driven below the tile field. The same layered planning matters on any full roof installation.
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