WHAT IS THAT?

Gloeocapsa magma is a species of bacteria in the gloeocapsa genus of cyanobacteria.  Gloeocapsa magma may resemble "algae" in that they are green, but in fact cyanobacteria are bacteria. This particular type of cyanobacteria is responsible for creating black stains and streaks on roofs. The bacteria accumulate over time as it feeds on moisture and calcium carbonate. This accumulation begins to show the black stains as the cyanobacteria develop their dark and hard UV-protective outer coating.

Once the bacteria have become noticeable, the stains will continue to worsen year to year. As the bacterial colony grows, gravity pulls it downward, resulting in the smear-like stain down roofs. Most experts within the subject area conclude the bacteria to be harmful, if left untreated, as the growth holds moisture within shingles causing premature aging, rotting, and/or granule loss. The buildup of Gloeocaspa magma on residential properties has led to earlier roof replacements, lowered property resale values, insurance companies canceling policies and increased utility costs as the black stained roofing draws in more heat.

There are many available options for the eradication of Gloeocapsa Magma, the most common and most widely accepted solution being an application of sodium hypochlorite[3] as well as copper sulfate. The preferred technique is a non-pressure application of a properly proportioned detergent mix, as this will avoid costly damage to the shingles. Many roof cleaning contractors offer this method of cleaning.The above method is used mainly in the USA