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Cleaning algae off of a composition roof is not as crucial as cleaning moss off of a composition roof but it is important. Algae usually manifests itself by causing a dark discoloring of your roof. On a white roof the results are of course much more noticeable than they would be on say a black roof. Cleaning off this algae can return your roof to its natural color which makes a very noticeable and a very desirable change in appearance. The aesthetic benefits are of value but are not the most important factor to consider. Though algae is not as immediately damaging as moss it can take its toll on your roof. Primarily the problem is that it will hold water and water of course breaks things down, things like your roof. Algae can also encourage moss and other damaging biological growth, such as lichen*, to grow by creating a moist environment and by providing other nutrients.
Cleaning algae off of your roof is not as stressful to your roof as is cleaning moss off of a composition roof. Most of the cleaning power comes from the use of a chemical solution, not high pressure. In this picture the right side has been sprayed with a chlorine solution and has not even been rinsed. Already the algae discoloration has nearly been removed. Unfortunately the moss does not come off with out the added use of pressure but as you can see the algae can be cleaned with not much more than a rinsing.
Of course preventative maintenance is always best so please look over the material under the question "How Often Should I Have My Composition Roof Pressure Washed?"
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Professional Pressure Washing Services
"Keeping the Green State in a Clean State"
We provide professional cleaning services for the Greater Puget Sound Region of Washington State. Practical Pressure is based in Tacoma, Washington and offers cleaning in the following cities and towns.
Seattle, Tacoma, Lakewood, Lacey, Olympia, Tumwater, Kent, Auburn, Black Diamond, Puyallup, Bellevue, Renton, Tukwila, Federal Way, DuPont, Steilacoom, Spanaway, Yelm, Roy and more.
Our services include roof cleaning (tile, shake and composition) maintenance and repairs as well as moss removal and moss prevention. We power wash decks, driveways, siding, gutters (we also do gutter cleaning), and just about anything else that you may want cleaned.