Kriegar's Roofing & Siding | Roofing Services in Rochester, NY 14590

Those black streaks are typically a type of algae called Gloeocapsa magma, which thrives in our humid Rochester climate, especially on north-facing roof slopes that stay damp. While the algae itself doesn't immediately damage the shingles, it retains moisture that can accelerate the breakdown of the roofing granules and shorten your roof's lifespan. It's also a sign your roof isn't drying properly. We can safely remove the stains and recommend solutions to prevent rapid regrowth.

Finding some granules, especially after a new roof is installed or a severe storm, can be normal. However, consistent or excessive granule loss is a common sign of aging shingles here in Rochester, often accelerated by freeze-thaw cycles and sun exposure. Granules protect the asphalt coating from UV rays. When they're gone, the shingles deteriorate faster. We'll inspect to determine if the loss is isolated or widespread, helping you decide between repair and replacement before leaks start.

The decision often comes down to the extent of damage and the age of your roof. For localized issues like a few damaged shingles from a fallen branch, a repair is usually sufficient. However, if we see widespread granule loss, curling or cracking shingles across multiple slopes, or recurring algae issues despite treatment, it often indicates the roofing system is nearing the end of its service life. We provide a thorough, honest assessment, factoring in Rochester's specific weather challenges, so you can make a cost-effective, long-term decision for your home.