Atlanta Roofing: Article About Types Of Roof Flashing
Flashing is one of the most critical elements of any roof, protecting seams and the most vulnerable areas of the roof from damage. While all roof flashing works in essentially the same way, it can vary slightly in its composition. When considering a new roof installation or significant repair job, it's worth consulting with a few reputable Atlanta roofing contractors to determine how best to handle the job. Among the various factors to consider, selecting the right kind of roof flashing can go a long way toward the roof's resilience and longevity.
In essence, roof flashing consists of metal sheets. These sheets are sized and shaped to fit snugly over any areas of the roof that have exposed seams. For example, if a chimney or dormer protrudes through the roof, it is typically necessary to affix flashing around the resulting seams. Likewise, in roof structures such as cross gabled roofs, the exposed valleys require flashing in order to prevent water from leaking through. Whatever the form of roof flashing used, its most fundamental requirement is that it provides an extra layer of protection for these areas, causing any precipitation to flow away from seams.
Typically, roof flashing is made of copper or steel, including tin coated or galvanized steel. Aesthetic as well as functional concerns may determine which kind of flashing material the architect or builder selects.
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Aside from the selection of materials, flashing may have either a one part or two part construction. As the name implies, one part flashing systems are attached securely to the rest of the roofing structure. These flashing systems consist of rigid sheets of metal, which cover areas such as the seams around chimneys or roof valleys.
On the other hand, two part flashing systems consist of two distinct elements: the base or step flashing and the counter flashing. The base or step flashing is securely fastened to the roofing. The other element, the counter flashing, sits atop this piece, but is not fixed in position. As a result, these two part flashing systems are uniquely suited to adjust as the roofing materials contract or expand. Whereas base or step flashing is almost always made of metal, the counter flashing may be made from wood siding, stucco, vinyl, aluminum siding or whatever material blends with the materials used in the house's construction.
Flashing serves a simple and crucial function. Yet, it comes in a variety of materials and designs. Consulting with a professional is the best way to ensure the right type of flashing is installed on a home.