What Is Gloeocapsa Magma?
Dark roof streaks are often associated with an algae-like cyanobacterium. Here is what homeowners should know about the discoloration.
Those dark streaks on your roof
Gloeocapsa magma is a cyanobacterium commonly associated with dark discoloration on asphalt-shingle roofs. Growth and staining are often most noticeable where shade and moisture persist.
Does it always mean roof damage?
A black streak is not, by itself, proof of a roof leak or structural failure. A qualified roof inspection can help distinguish surface staining from damaged or aging roofing materials.
Why soft washing is used
Roof soft washing uses controlled, low-pressure cleaning methods rather than aggressive high-pressure spray. Solution choice, roof condition and manufacturer guidance all matter.
When to get advice
If you see persistent streaking, moss or lichen—or notice loose shingles or leaks—ask for a roof assessment before scheduling cleaning.