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Rain and water is one of the major weather factors that continually threaten down your roof and invade your house in the form of a roof leak. Roof flashing is as important in preventing roof leaks as are the shingles themselves. The roof flashing is a thin metal, usually painted, galvanized or can be made from copper, aluminum etc. But not all flashing is the same. There are several different types of flashing which can be used close to many details on the roof.

Flashings: eaves, rakes, walls, chimneys, etc.

All areas on the roof surface where roof planes intersect or protrude through the roof surface (chimneys, vent stacks, dormers, walls, etc.) require flashings. Flashing is the construction procedure which is necessary to make these areas waterproof. Metal flashings are effective, because when properly installed, they can help accommodate roof, chimney, wall, or structural movements due to settlement, expansion, and contraction. Roof flashing drains water and is constructed in a system to work with the effect of gravity. When designed and installed correctly, flashings can only be defeated by water running upward. This can happen in the presence of snow, ice or wind-driven rain.

Flashings installation

Drip edge flashing on eaves and rakes

Drip edge is the simplest flashing. It is used at the rakes and eaves. It provides efficient water shedding and protects the underlying wood from rotting. The drip edge should be made of a corrosion-resistant material that extends back at least 8 cm from the roof edge and bends downward over the fascia/roof boarding. Apply the drip edge underneath the underlayment along the eaves to allow water to shed smoothly off the roof if it gets under the shingles.

The rake flashing is installed on top of the underlayment to prevent wind-driven rain from getting beneath it.