The black streaks that you're seeing on your roof are called Gloeocapsa Magma, aka (roof algae), and it feeds on the limestone that is embedded in your shingles. This is very destructive to the singles structural integrity. Roof algae is alive and living and it spends it entire life feeding on your roof and eventually infesting the entire roof. At this point it is only a matter of time for your roofs integrity to fail. Typically, on an untreated 25 year shingle, you only get 15 to 18 years of protection. Over the years I have been witness to hundreds of roofs that have prematurely failed due to Gloeocapsa Magma. Gloeocapsa Magma has many different vessels it uses to disseminate itself. Such vessels include squirrels, birds and the wind. There really is no way to stop it from spreading. The best thing you can do is treat it.
Treating your roof should be done by a Certified Roof Cleaner. This is very important! Having been in the construction industry for over 20 years, I have seen professional roofers fall off roofs. Any kind of roof cleaning should be done by a Certified roof cleaner If you can’t find a certified roof cleaner in your area, check out this link American Roof Cleaners Association.or Roof Cleaning Institute of America Theses sites are ranked the best in the world for roof cleaning industry.
Another important issue I would like to address about roof cleaning is the methods by which it is done. Roof cleaning should follow the recommendations of the shingles manufacturers. Here are some links to the Shingles Manufactures. These methods should be practiced by all certified roof cleaners. Another issue I would like to talk to you about is the usage of a power-washer/pressure washer on your roof. I can’t emphasize on how much damage this can cause to your asphalt shingle roof. Power washing your roof decreases the life of the roof considerably and voids out all your warranty. Typically, if someone tells you that they use low pressure on your roof, but they use a standard power washer,they are not a certified roof cleaner and don’t know what they are doing. They will do more harm them good. It very much concerns me that there still are guys out there using power washers on roofs. These guys are giving roof cleaners a bad name in the business…PRESSURE WASHERS belong on the ground not the ROOF!!!!
Certified Roof Cleaning - Gutter Cleaning - House Washing - Algae Removal - Mold Removal - Deck Staining - Deck Cleaning - Fence Staining - Fence Cleaning - Wood Restoration - Window Cleaning - Pre Construction - Post construction - Pressure Washing - Roof Stain Removal