The flashing itself is sheet metal, or similar material which is applied at the joints, openings, or where different materials meet, e.g. chimney, vents etc. it is intended to protect the framing and insulation from the rain, snowmelt, and moisture. If any of those penetrates the roof, they may cause damage to insulation – affecting the energy consumption, and may also damage walls and ceilings. Flashing will be used where roof and wall join. The most common material used for flashing is aluminum; it is lightweight, inexpensive, and resistant to corrosion. One problem it has is its shininess, it needs to be painted, and aluminum does not paint well. A better yet more expensive option is copper; it has a very long life expectancy and requires no maintenance.
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