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BRC Exterior Cleaning Solutions Details Why North-Facing Slopes Streak First in Summit County Akron, United States - ...
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If you see black streaks running down your roof shingles, here's what they're telling you
Black streaks on shingles are caused by a living algae called Gloeocapsa magma, not pollution or dirt. The algae feeds on limestone filler in asphalt shingles and can be invisible for one to two years ...
House Digest on MSN
Those Dark Stains On The Roof Aren't Dirt
If you're noticing some dark stains on your roof that aren't easily cleaned, you may have a bigger problem than you think.
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