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Roof flashing is an essential component of any roofing system. Often underrated, it plays a pivotal role in maintaining the integrity and longevity of your home. Flashing acts as a waterproof seal at the various intersections on the roof, such as around chimneys, vents, and where the roof joins a wall. Understanding its importance can save homeowners from costly repairs due to water damage.

Here are three reasons why roof flashing is vital for the health of your roof:

  • Prevents Water Damage: By channeling water away from vulnerable areas, flashing prevents it from seeping into the roof decking and into your home.
  • Protects Against Corrosion: Materials used in roof flashing are designed to resist corrosion, thereby protecting the structural integrity of the roof.
  • Enhances Roof Longevity: Properly installed flashing can significantly extend the life of your roof by minimizing leaks and other weather-related issues.

In this post, we’ll explore the five main types of roof flashing that every homeowner should know about. Understanding these can help in identifying potential issues and make informed decisions when consulting roofing professionals.

Continuous Flashing

Continuous flashing, also known as “apron flashing,” is a long, single piece of metal that directs water down to the shingles below, mostly used where a vertical wall meets a sloped roof. It’s crucial for preventing water from seeping behind the chimney or vertical walls. Continuous flashing is typically made of aluminum, copper, or coated steel.

Continuous flashing needs to allow for expansion and contraction, which can be handled through the use of expansion joints or by installing sections of flashing in a way that lets them move.

step flashing

Step Flashing

Step flashing consists of rectangular flashing pieces intertwined with shingles and integrated into the siding. It’s used around chimneys, walls, dormers and other vertical structures that penetrate a sloped roof. Step flashing provides protection from water damage by creating a waterfall effect as it directs water away from the vulnerable joints.

This type of flashing is most effective along the walls that intersect the roof. Each piece of step flashing directs water over the shingle below it. This layered installation method makes it exceptionally reliable at keeping water out, particularly in areas that experience heavy rainfall.

Counter Flashing

Counter flashing is typically installed on top of step flashing or continuous flashing to provide extra protection against water infiltration. It’s commonly used on chimneys, where it’s layered with step flashing along the sloped parts of the chimney and then sealed off with mortar or caulk. Counter flashing is typically made of metal and can be customized to fit the specific design and size of a chimney.

Counter flashing is an essential component in preventing moisture from getting behind brick, stucco, or other wall materials that are typically not waterproof. It’s commonly used around chimneys where step flashing meets the chimney’s masonry.

Drip Edge Flashing

Installed along the edges of the roof, drip edge flashing serves a dual purpose. First, it helps water drop off the roof edge cleanly, away from the underlying structures and the foundation of the home. Second, it prevents wind-driven rain from getting under the roofing materials at the edges.

Drip edge flashing can be made from various materials, including aluminum, stainless steel, and plastic. It comes in two shapes: L-shaped and T-shaped. The L-shaped drip edge is designed to fit under the layer of shingles at the edge, while the T-shaped drip edge goes on top of it. Both types have a small angled lip that directs water away from the fascia board and into the gutters.

This type of flashing is integral to maintaining dry and damage-free roof decking and fascias.

Vent Pipe Flashing

Vented pipes are common on most roofs, and flashing in this area is critical for preventing water leaks. Vent pipe flashing consists of a boot-shaped piece of metal with a rubber gasket that surrounds the vent pipe, creating a watertight seal. The base of the boot sits over the shingles, allowing rainwater to run off without seeping into the roof.

Valley Flashing

Valleys are found where two roof slopes meet, creating an area that is highly susceptible to water runoff and thus potential leaks. Valley flashing is made to protect these critical areas. It’s installed under the shingles on both sides of the valley and over a layer of roof membrane. Valley flashing is typically made from galvanized steel, but it can also be found in copper and aluminum.

Proper installation of valley flashing is vital to ensure that water runoff flows seamlessly down into the gutters or off the edge of the roof. Typically, it’s a W-shaped piece of metal that channels water down the roof’s valley safely away from the decking and into the gutters.

a chimney

Chimney Flashing

Chimney flashing seals the gap between the chimney and the roof to avoid water penetration. This system usually comprises three parts: the saddle, the step flashing, and the counter flashing.

The saddle is the top piece that sits at the base of the chimney. It’s a continuous piece of metal that diverts water runoff onto each side. Step flashing is installed on top of the shingles and overlaps with the saddle, while counter flashing covers it from above and overlaps with the step flashing.

This type of flashing requires precision in its installation to prevent water from seeping in between the layers. Each part works together to redirect water away from the chimney and off the roof, ensuring no water can enter your home through the chimney base. Proper installation of chimney flashing is critical for preventing water damage to both the roof and the chimney itself.

Get Your Roof Flashing Checked Out Today

Whether you’re maintaining an existing roof or planning a new roofing project, understanding the types of roof flashing is crucial. Each type plays a unique role in directing water away from the house, preserving the structure of your roof, and ensuring your home remains safe and dry.

If you’re inspecting your roof and notice issues with your flashing or have concerns about potential leaks, don’t hesitate to reach out to the experts. Contact Kenneth Daniel Roofing for professional advice and repair services. Ensuring your roof’s flashing is correctly installed and maintained is an investment in the health and longevity of your home.

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