This is an example of a roof covered with algae. The soft washing cleaning method is also great for removing moss and lichen which are both organic materials growing on the surface on the roof. Soft washing works by killing the mold and algae and then clinging to the cells to be rinsed away.
According to Wikipedia, standard American asphalt shingle roofs contain limestone, which store high levels of 'bacteria food'.
It is very common for this algae, moss, and mold to grow on the north facing side of homes our buildings. This is because the north side receives less sunlight allowing the algae to grow in a cool damp surface.
Roof cleaning is a great way to maintain the aesthetic appeal of your home but it also helps reduce the amount of algae spreading around your homes exterior surfaces.
Shingle roofs are the most common types of roofs we clean in Harrisburg, however soft washing can be used on metal roofs, tile roofs, and rubber roofs. Soft washing is great because of its versatility in the exterior cleaning market. The soft wash process can be used to clean many different types of exterior surfaces without the risk of causing damage.