Various companies have different methods for cleaning a roof. Some will show up to your home with brooms and brushes to knock off the moss. They’ll finish the roof with a zinc powder. This method is usually the cheapest and offers immediate visual results. The downside is that it is going to significantly age your roof by removing vital granules and the roots will still be intact. The result is that the moss will just be back next year. For a typical 2 story 2,000 sq ft roof, you can expect to pay $300-500 for this service that needs to be completed yearly.
Professional cleaning companies will utilize a soft wash method. They will use an areal map to get the square footage of your flat roof. They will add units to compensate for pitch, complexity, and the amount of growth. Then they will provide a price based on these factors. For a typical 2 story 2,000 sq ft roof, you can expect to pay $600-900 for this service that needs to be completed every 3-5 years.
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