York Roofing | Roofing Services in York, PA 17404

Those black streaks are actually a type of algae called Gloeocapsa magma, which thrives in York's humid climate. It feeds on the limestone filler in asphalt shingles. While it doesn't immediately damage the roof structure, it's unsightly and can trap moisture. We don't recommend pressure washing, as it can damage shingles. Instead, we use a specialized, low-pressure soft wash system with an EPA-approved algaecide to safely eliminate the algae and help prevent it from returning quickly.

Not necessarily, but it's a serious warning sign common in our area. Shingle curling in York is often caused by moisture trapped underneath from poor attic ventilation or from thermal shock due to our temperature swings. We start with a thorough inspection to diagnose the root cause. Sometimes, improving ventilation can halt the problem. If the curling is isolated, repairs may suffice. However, widespread curling indicates the shingles are failing, and we'll advise if a replacement is the most cost-effective, long-term solution to protect your home.

For a lasting solution against York's specific challenges, we recommend and install algae-resistant shingles. These shingles have copper or zinc granules embedded in them that inhibit algae growth, preventing those black stains. We also ensure your new roof system includes proper, code-compliant attic ventilation to regulate temperature and moisture, which is key to preventing shingle curling and premature aging. Investing in these quality materials and correct installation from the start saves you money and headaches down the road.