Flashing helps direct the flow of water around openings. Learn how to correctly install flashing when constructing a new house or altering the exterior of a house.
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Flashing can be made of sheet metal, plastic or composite materials. Sheet metal flashing is the most durable, and usually the most expensive choice. Copper or stainless steel can be used as flashing. Plastic flashing, usually PVC-based, is a less expensive alternative to metal, but if parts are exposed, it can wear with direct sun contact. Metal flashing is usually chosen for dormer windows. Flashing squares are inserted between each row of roofing material. Flashing can also be used as a strip that runs around the dormer and under the roofing material. Unlike other windows in your home, the flashing is also extended into a front apron, which overlaps the roof material. As dormer size and window style vary from house to house, the details can be different for your house.
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