While flashing is available in a number of different materials the most commonly used is galvanized metal. Flashing is used for protection against leaks in vulnerable areas of the roof and/or where there is heavy water runoff. One way to think of flashing is like a kind of metal molding around chimneys, dormers, vents, skylights, and in valleys those areas where leaks are most likely.
The most common types of flashing are:
Vent pipe flashing used to protect the area around a vent it typically has a flange at the bottom which is incorporated into the shingles as they are installed.
Valley flashing protects the valleys of a roof. Flashing is installed on top of the felt paper and then the roofing material is installed over top.
Z flashing used for flashing the area where a roof or deck meets a wall.
Step flashing creates a step like appearance on the side of a chimney or dormer. This is created by individual strips of flashing being added with each layer of shingles.
Lead flashing used with tile roofs the lead is formed to the shape of the tile.
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