Bob & Sons Roofing | Roofing Services in Minneapolis, MN 55410

That black grit is likely granules from your asphalt shingles, and it's a common issue we see in Minneapolis. Our intense sun in summer, heavy rain, and winter freeze-thaw cycles can accelerate granule loss, which is a sign of shingle wear. While some loss is normal, excessive loss leaves your roof vulnerable. We recommend a professional inspection to assess the extent and discuss repair or replacement options to prevent leaks.

In Minnesota, flashing—the metal strips around chimneys, vents, and valleys—often fails due to repeated expansion and contraction from our extreme temperature swings. This can cause it to separate, bend, or crack, leading to leaks. At Bob & Sons, we repair or replace damaged flashing using durable, properly sealed materials and techniques designed to withstand our local climate, ensuring a watertight seal for years.

It can be tricky! Normal wear, like granule loss, is often uniform, while hail or wind damage from one of our Twin Cities storms typically creates a random pattern of dents or localized lifting. The best course is a free, expert inspection from our team. We'll identify the cause, document any storm damage for your insurance claim, and provide a clear, honest recommendation for the necessary repair.