Black and green stains are evidence of algae, moss, or lichens. They’re common, particularly in wet and humid climates, and should be cleaned regularly to avoid the rot, mold, and water damage that they can cause.
METAL ROOF HANDLE WIND, RAIN, FIRE, LIGHTNING, AND HAIL?
If you’re concerned that your metal roof won’t stand against the weather and elements, you can relax. Metal roofing can handle winds