Many people are not familiar with roof flashing and its uses. Roof flashing is a material used in construction and roofing to seal the joints between different materials. It is available in a variety of widths, thicknesses, and finishes to suit any need. There are three main types of roof flashing: lead, copper, and aluminum. Each type has its own advantages and disadvantages.

Lead is the most common type of roof flashing. It is durable and easy to work with. Lead can be formed into any shape and will not corrode. However, lead is heavy and difficult to install. Copper is another common type of roof flashing. Copper is light and easy to work with. It will not corrode and is fires resistant. However, copper is expensive and difficult to install. Aluminum is the least common type of roof flashing. Aluminum is light and easy to work with. It will not corrode but it is not as durable as lead or copper.

Types of Flashing and Their Installation Methods

Valley Flashing: Valley flashing is installed in the valleys formed where two sloping roof planes meet. It is installed over the top of shingles on both sides of the valley and then covered with new shingles. Valley flashing can be riveted, screwed, or soldered in place.

Chimney Cricket Flashing: Chimney cricket flashing is installed on the back side of a chimney to shed water that comes down the roof slope behind the chimney. It is usually made of copper or flashing lead and should be installed by a professional.

Skylight Flashing: Skylight flashing helps to seal skylights against water infiltration. It can be either factory-made or field-made using drip edge, base flashings, counter flashings, and cap flashings.

Hip and Ridge Cap Flashing: Hip and ridge cap flashing helps seal the hip and ridge lines of a roof against water infiltration. It should be made of corrosion-resistant material like galvanized steel, aluminum, or copper. Hip and ridge cap flashings can be either factory-made or field-made using individual step flashings.

Wall Step Flashing: Wall step flashing helps shed water that runs down vertical walls behind the plane of a sloping roof. It consists of L-shaped pieces of metal that are installed over the course of shingles up the wall until they reach the top edge of the sloping roof plane.

Flashing plays an important role in preventing water infiltration in your home by sealing vulnerable areas where roofs meet walls or valleys are present. While some types of flashing can be installed by DIY enthusiasts, we recommend consulting with or hiring a professional for installation to ensure proper protection for your home.