If you’ve noticed long black stains running down your shingles, it’s not just dirt — it’s Gloeocapsa Magma, a type of roof algae that thrives in humid conditions. Over time, this algae feeds on the limestone filler in asphalt shingles, breaking down the very material meant to protect your home.
Left untreated, those streaks spread quickly — especially on shaded or north-facing slopes. What begins as a cosmetic issue can turn into a serious problem for your home.
The Black Streak Story
A Homeowner’s Wake-Up Call
Last summer, a family in South Jersey called us after noticing their once-beautiful roof turning almost black. They thought it was just dirt, but within months, their shingles started curling at the edges and moss was spreading across half the roof. Their energy bills had climbed, and they were considering a costly replacement.
Instead, we stepped in with our safe, non-bleach cleaning system. Within a day, the black streaks were gone, the roof looked brand-new, and they saved thousands by avoiding premature replacement. Their curb appeal — and peace of mind — came back instantly.
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