John C Fast Roofing | Roofing Services in Coldwater, MI 49036

Those black stains are likely roof algae, which is common in our humid Michigan climate. While DIY cleaning is possible, improper methods or pressure washing can damage shingles. We safely apply EPA-approved, zinc-based cleaning solutions that kill the algae at the root without harming your roof's integrity, providing a longer-lasting solution than surface cleaning alone.

Coldwater's freeze-thaw cycles and temperature extremes are tough on traditional flashing materials, accelerating corrosion and weakening seals. We combat this by using premium, corrosion-resistant metals like aluminum or copper for flashing replacements and ensuring precise installation with durable sealants. A proper inspection can determine if repair or a full corrosion-resistant replacement is needed.

Absolutely. A professional inspection is the best defense. We look for early signs of algae growth, which can trap moisture and degrade shingles over time, and meticulously check all flashing points for corrosion, cracks, or separation. Catching these local issues early allows for simpler, more affordable repairs and prevents minor problems from leading to major leaks or structural damage.