Those ugly black streaks on your roof are actually an algae growth called Gloeocapsa Magma and it is feeding on the limestone filler in the shingle. Left untreated it will undermine the granules of the shingle, and hold moisture, leading to increased cooling costs due to the inefficiency of the roof and not to mention thousands of dollars in early replacement costs.
Once the algae have become noticeable, it has actually been growing on the roof for quite some time. The algae will continue to colonize, getting worse rather quickly, especially on the north facing slopes.
The solution to this unsightly and damaging problem is our Safe Non-Pressure Roof Cleaning system. Ohio Power Washing uses the ARMA (Asphalt Roofing Manufacturers Association) Approved cleaning method. Never use or let anyone use a pressure washer on your roof, this can do severe damage and void your warranty. Our treatment will safely remove the algae and restore your roof to its original color and beauty, adding curb appeal and value.