The Different Types of Valley Flashing
2. Choosing the Right Material
Now that we know what valley flashing is, let’s explore the different types available. Just like there are different kinds of pizza (and everyone has their favorite), there are different types of valley flashing, each with its own pros and cons. Choosing the right one depends on your roof’s material, the climate you live in, and, of course, your budget.
Open Valley Flashing: This type leaves the flashing exposed, creating a visible channel for water to flow. It’s often used with materials like slate or tile, as it allows for better drainage. Picture it like a mini-canal running down your roof. It needs to be wide enough to handle heavy rainfall.
Closed Valley Flashing: With closed valley flashing, the roofing material is woven or overlapped to conceal the flashing beneath. This offers a more aesthetically pleasing look, but it’s important to ensure the weaving is done correctly to prevent water from getting trapped and causing problems. Think of it as a secret agent, hidden from view but working hard behind the scenes.
Woven Valley Flashing: This is a specific type of closed valley where shingles from each side of the valley are interwoven. It’s generally used with asphalt shingles and provides a clean, seamless look. However, it can be more prone to leaks if not installed with precision. It’s a bit like a carefully crafted braid, but with shingles.
Metal Valley Flashing: Regardless of whether the valley is open or closed, the flashing itself is typically made of metal. The common choices include aluminum, steel (often galvanized), and copper. Copper is the most durable and aesthetically pleasing (it develops a cool green patina over time), but it’s also the most expensive. Aluminum and steel are more budget-friendly options, but they may not last as long, particularly in coastal environments. Think of it as choosing between a luxury car (copper) and a reliable sedan (aluminum/steel).