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Independent Studies & Trusted Resources
As part of our commitment to help homeowners, this section is here to help you stay informed. We' have gathered independent studies and credible resources that explain the science behind our soft-washing methods, environmental impact, and long-term value. We believe an informed customer is an empowered one—and we are proud to share the knowledge that guides everything we do.
Source:
Asphalt Roofing Association
Technical Service Bulletin
For many years, roof discoloration caused by algae has been observed throughout the United States and Canada. The dicoloration usually has a brown to black appearance and may be mistaken for fungus growth, soot, dirt, moss, or tree droppings.
Gloeocapsa magma is 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 on roofing structures and other outdoor surfaces. Natural pigments produced by these algae may cause white or light-colored roofs to gradually turn dark brown or black. Discoloration may appear uniform or as streaks. The algae discolorations should not be confused with moss or tree droppings, which typically produce only localized discoloration. Consult the shingle manufacturer for information concerning the effects of moss growing on asphalt shingles and recommendations for its removal.
Algae discoloration of roofs is 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 U.S. and southern regions of Canada, especially those subjected to warm, humid conditions. It should be noted that almost all types of roofing systems are susceptible to algae discoloration. It is, of course, most readily visible upon light- colored roofs, while it is not so visible upon darker shades of roofing.
Link to full report:
Independent Website:
https://www.asphaltroofing.org/algae-discoloration-of-roofs/
