The answer to 'architectural shingles algae growth' is that algae growth on architectural shingles is a common problem caused by a combination of moisture, shade, and organic debris. Symptoms include dark green, black, or reddish-brown stains or streaks on the shingles. While this is primarily an aesthetic issue, it can lead to premature shingle deterioration if left untreated.
The best solution is to regularly clean the affected shingles using a soft-bristle brush and a mild bleach-based cleaner. For more severe cases or hard-to-reach areas, it's best to call in a professional roofing contractor who can safely and effectively remove the algae growth. DIY approaches should be limited to small, accessible areas, as working on a roof can be dangerous without the proper safety equipment and experience.