If your roof has unsightly black stains or streaks, you are most likely dealing with a hard type of algae called Gloeocapsa Magma. This type of algae feeds on the crushed limestone, cellulose and various wood products that are used in the production of asphalt shingles, resulting in a destructive algae infestation. Rain and shade can worsen the condition by spreading the algae and causing black streaks on the roof. In fact, the appearance of black or green stains is the first sign that damage may be occurring. These streaks can not only affect curb appeal, but they can also cause shingles to fail prematurely. This happens by compromising the function of your shingle and not allowing them to reflect heat properly. If this biological growth has infected your roof, it should not be ignored.
Cleaning your roof is a simple and affordable way to protect your shingles and increase the life of your investment. Shingle companies like Owens Corning and GAF as well as the Asphalt Roofing Manufacturers Association (ARMA) recommend LOW PRESSURE(Soft Wash) roof cleaning using a chemical application to restore shingles suffering from algae. High pressure power washing should only be used as a last resort in the most severe cases of algae/mold buildup. Pressure washing could damage your shingles and void your existing warranty.
If your shingles are still in good shape, but have algae on them, having your roof cleaned will allow you to get the full life out of your shingles and save thousands of dollars. On average roof washing for a 2,000 square foot home is approximately $360. The replacement cost is around $12,000. That means you can wash your roof for roughly 3% of what it would cost to replace it. Soft wash roof cleaning should be the first option you look into before completely replacing your roof. If you would like an estimate or if you have any questions please feel free to contact us.
Here is a quick video of our soft wash roof cleaning: