The answer to 'metal roof algae growth' is that it is a common problem caused by environmental factors like moisture, shade, and poor air circulation. Symptoms include dark green or black discoloration on the metal roof surface. The good news is that there are several effective solutions, both DIY and professional, to address this issue.
For minor algae growth, homeowners can often clean the roof themselves using a mild detergent or bleach solution and a soft-bristle brush. However, for more extensive or recurring algae problems, it's best to call in a professional roofing contractor. They have the right tools, products, and expertise to properly treat the roof and prevent future algae growth.