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Show Metal Drip Edge, 'Flashing Strip' Bar Roof Damage When applying asphalt shingles to a new deck or over an old roof, a metal drip edge and a "flashing .strip of mineral-surfaced roll roofing at least 36 inches wide should be applied along the eaves. The purpose is to protect the roof deck and interior walls and ceilings from damage in the event the roof drainage system becomes clogged because of ice forming in eaves troughs. The flashing strip, extending 36 inches up the roof, prevents backed-up slush and snow from penetrating the roof deck. First to be applied is the metal drip edge, made of corrosion-resistant corrosion-resistant 26-gauge sheet metal. Galvanized steel, painted on both sides, generally is used. The drip edge, two to four inches wide, should be bent down over the eaves far enough to cover the edges of the roof deck sheathing. Then the flashing strip of heavy asphalt roll roofing is placed along the eaves in such a manner that it will overhang the metal drip edge by one-fourth to three-eighths three-eighths of an inch. |