Gloeocapsa Magma (roof algae) is the most common type of algae on roofs today. Please allow me to get right to the facts: Gloeocapsa Magma spreads through air borne spores. It embeds itself deep in the granules and FEEDS on the limestone in the shingle. This cuts the life of the roof considerably. By not treating this infestation the roof will fail prematurely costing thousands. By treating the roof, you can put years of life back into your roof.
An average roof runs about $300 to $600 dollars to treat. The average roof replacement is $4000 to $10.000. Here is another fact, 50% of the roofs are replaced due to the way they look, not the structural integrity of the shingles. For more info check out Roof Cleaning Institute of America orAmerican Roof Cleaners Association Here you will find a unlimited amount of information and also you can find a certified roof cleaner in your area.

Lichen and Moss are also commonly found on roofs. This too will cause failure to the roof if untreated. Lichens are the hardest to remove safely. Lichen roots run deeper in the shingle than moss. They take allot longer too release from the shingle as where moss only takes a few days to release. Moss is the worst one you can have on your roof due to the fact that it holds allot of moisture against your roof and likes to grow on the edges of the shingle causing them to lift. This makes the roof vulnerable to wind damage. When treated, lichen and moss will start to turning colors, eventually turning black or white indicates that the fungus are dead. Once they are dead they will release their hold on the surface. Depending on the amount of rain fall will determined the amount of time this fungus stays on the roof. Rain will eventually wash it all away.. I tell all my customers when dealing with lichen and moss you have to be patient.AND NEVER USE A PRESSER WASHER on the roof...