Flashing is an essential component of a roof's structure, yet it's often overlooked when we think about roofing. So, let's delve into what flashing is and why it's so crucial to the longevity and functionality of your roof.
At its most basic, flashing consists of metal pieces strategically placed around the more vulnerable points of your roof. While most of the roof is covered in underlayment and shingles, areas such as eaves, rakes, valleys, sidewalls, and roof penetrations require additional protection—that's where flashing comes in. These spots are significantly more prone to leaks, especially if the flashing isn't sealed or installed correctly.
It's a rare occurrence to find a leak stemming from the center of a field shingle or underlayment. Typically, the culprit behind a leaking roof is faulty flashing. For instance, consider the valleys on your roof, where two planes meet and form a V-shaped depression. These valleys channel a considerable amount of water that needs to flow smoothly off the roof. Valley metal, which can vary in width, is installed here to ensure that water doesn't pool and cause damage. Without properly installed valley flashing, sloped areas can become reservoirs of trouble.
As for sidewalls, step flashing is commonly used where the roof meets a vertical structure, such as a wall. This type of flashing accounts for the expansion and contraction seen in colder climates, where materials are exposed to a wide range of temperatures. In warmer climates, like Florida, a different set-up, such as L flashing, might be embedded directly into stucco surfaces. If these critical connections aren't correctly flashed, water can penetrate, trickle down the walls, and eventually find its way into your home.
Don't forget about the penetrations in your roof—things like vents and skylights. These areas are exceptionally susceptible to leaks if not properly sealed. Special pieces, such as lead boots or gooseneck vents, are used to ensure that water can't infiltrate around these openings. If these flanges aren't installed and sealed properly, even the best shingle job won't prevent leaks when water is funneled towards these penetrations.
It's important to recognize that each section of flashing has its specific purpose and requires a tailored approach to installation. The flashing for a vent is different from what you would use for a valley or a sidewall. Moreover, the particular design of these pieces is meticulously thought out to meet the needs of those vulnerable roof sections and prevent water damage.
In conclusion, while shingles might get all the glory in the roofing world, flashing is the unsung hero, safeguarding the trickiest spots from moisture and the elements. Properly installed and maintained flashing is the key to a healthy roof that stands up to the battering of rain, snow, and wind over time. Always ensure that your flashing is in good condition, and if you're unsure, consider consulting with a roofing professional to prevent minor problems from becoming major leaks.
