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Algae Discoloration: Cleaning black stains from your roof

  • September 4, 2018

Technical bulletin Asphalt Roofing Manufacturers Association 1156 15th St., NW, Ste. 900 Washington, DC 20005 Tel: (202) 207-0917 • Fax: (202) 223-9741 www.asphaltroofing.org ARMA Form No. 217-RR-89 What are the Black stain's on your roof? For many years, roof discoloration…

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