Roof flashing is a vital component of a roofing system that helps prevent water leakage and protects vulnerable areas of the roof. Here are some common types of roof flashing:
1. Step Flashing
Step flashing is typically used along the junction where the roof meets a vertical surface, such as a chimney or wall. It consists of individual metal pieces that are interwoven with the shingles or roofing material and the vertical surface, creating a step-like pattern. Step flashing helps redirect water away from these vulnerable areas and ensures a watertight seal.
2. Valley Flashing
Valley flashing is installed in roof valleys, where two roof planes intersect and create a channel for water flow. It is typically made of metal, such as aluminum or galvanized steel, and is designed to direct water down the valley and away from the roof. Valley flashing is often installed beneath the shingles or roofing material and is crucial for preventing water penetration in this critical area.
3. Drip Edge Flashing
Drip edge flashing is installed along the edges of the roof, where the roof deck meets the eaves or the roof overhang. It helps direct water away from the fascia and prevents water from seeping under the roofing material. Drip edge flashing is typically made of metal and is available in various shapes and sizes to accommodate different roof configurations.
4. Chimney Flashing
Chimney flashing is used around the base of a chimney to create a watertight seal between the chimney and the roof. It typically consists of step flashing along the sides of the chimney and a base flashing at the bottom. Chimney flashing may also include a cricket or saddle, which is a small peaked structure that diverts water around the chimney.
5. Pipe Flashing
Pipe flashing is used to seal around protrusions such as plumbing vent pipes or exhaust vents. It typically consists of a base flashing that is secured to the roof and a flexible rubber or metal collar that fits around the pipe. Pipe flashing ensures a watertight seal around these vulnerable areas and helps prevent water infiltration.
6. Skylight Flashing
Skylight flashing is specifically designed for skylight installations. It includes a combination of step flashing, apron flashing, and collar flashing to provide a watertight seal around the skylight opening. Skylight flashing is essential for preventing water leaks around the skylight and maintaining the integrity of the roofing system.
These are just a few examples of the types of roof flashing commonly used in construction. The specific type and configuration of flashing required depend on the design of the roof, the materials used, and the specific installation requirements. It’s important to consult with a roofing professional to ensure proper selection and installation of flashing for your specific roofing project.