Those ugly black streaks you see on asphalt shingle roofs are a bacteria called Gloeoscpsa Magma. This bacteria feeds on the limestone in shingles, leading to premature degradation. Insurance companies are aware of this and have started requiring roof washes to continue coverage. The Asphalt Roofing Manufacturers Association recommends a soft wash to safely clean your shingles to avoid damage from a pressure washer. The average cost of a new asphalt shingle roof in Middle Tennessee over $20,000. Upkeep uses the most up to date techniques and equipment to safely clean your roof and help you uphold your side of the deal so you can hold your insurance company to their side.