Discoloration of Roofs(All Information sourced from Asphalt Roofing Manufacturers Association)
Roof discoloration caused by algae has been observed throughout the United States and Canada. The
discoloration usually has a brown to black appearance, and may be mistaken for fungus growth, soot, dirt, moss, or tree
Gloeocapsa magmais probably the most prevalent of several algae species that contribute to discoloration. All species are transported through the air, and tend to collect and grow upon roofing structures.
- Algae growth occurs to varying degrees in all regions of the country,
especially those subjected to warm, humid conditions.
- Algae discolorations are difficult to remove from roofing surfaces, but may be lightened by applying a solution of liquid household chlorine bleach (sodium hypochlorite) and water.
Natural pigments produced by these algae may cause a white or light colored roof to gradually turn dark brown or black. Discoloration may appear as uniform discolorations or streaks. The algae discolorations should not be confused with moss or tree droppings, which typically produce only localized discolorations. This type of roof discoloration has been most widespread in the Gulf States and along the Northwest and Eastern Seaboards.
It is not, however, confined exclusively to these regions. Algae growth occurs to varying degrees in all regions of the country, especially those subjected to warm, humid conditions. It should be noted that almost all types of roofing systems are susceptible to algae discoloration.
We'll save you money by safely cleaning your roof!
We can clean the unsightly black streaks and stains on your roof by using a low pressure chemical application using certain cleaners to restore shingles and tiles suffering from roof algae, followed by a low pressure rinse. We use the cleaners and methods recommended by these roof manufacturing companies for a safe and damage free roof cleaning. If your shingles are still in good shape but have roof algae on them, having your roof cleaned will allow you to get the full life out of your shingles, saving you thousands of dollars.
We can save you thousands by cleaning it rather than replacoing it
Some roofing contractors tell you it can't be cleaned without damaging the shingles. They may tell you that the roof needs to be replaced. This is absolutely false. If your shingles are still in good shape. The algae can be killed and removed properly without damaging the shingles using a low pressure chemical application (recommended by shingle manufacturers).