How to Clean Algae on a Roof

Algae is the thin green or black coating you will see present in cool and damp areas of your roofing system. As we discussed in our article, “How to prevent Algae Growth,” algae can deteriorate the life of your shingles but not as much as cleaning it can.

Algae can make your roof look older than it is and less desirable if you are trying to sell your home. The condition of your roof is also one of the first things people notice as well as appraisers. According to this article on Houselogic (http://houselogic.com/home-advice/home-improvement/adding-curb-appeal-value-to-home/ , your roof greatly affects your homes curb appeal and can save you thousands as well as shorten the length of time it takes to sell.

If would like to have your roof cleaned you most certainly can but hear the precautions before proceeding with any roof cleaning;

  1. Make sure that anyone cleaning your roof is experienced and knowledgeable with roofing systems.
  2. Appropriate precautions need to be taken with your gutters and shrubbery around the perimeter of your home. Some chemicals used can tarnish copper gutters and kill shrubbery.
  3. Check with your shingle manufacturer to see what their recommendations are for cleaning your roofing system to ensure that you do not void your manufacturer’s warranty.
  4. If your roofing system is within a few years of replacement we do not recommend cleaning your roof as you will further reduce the life expectancy of your roof and most likely cause leakage with more damage.

When cleaning your roofing system you will need to use great care not to damage the shingles and reduce the roof life. We recommend removing the algae with a gentle cleansing brush or water hose after using a liquid Chlorine Bleach, TSP (Tri-sodium phosphate) and water.