Roof Cleaning is the removal process of algae, mold, mildew, lichen, and moss buildup from the surface of the roof. Cleaning your roof can significantly extend the lifespan of your roof, and prevent you from replacing it prematurely.
Most organic buildup, including algae, usually forms on the northern and western parts of the roof because these areas are often shaded or receive less sun. The accumulation and presence of soot, dirt, or organic materials can also affect how much sunlight your roof absorbs, which in turn can affect the amount of heat a building absorbs.
Ordinarily, roof cleaning is accomplished with a soft wash process using bleach or vinegar solution and a surfactant. However, as of late, there has been a tremendous amount of controversy between this process and an entirely green process.
Additionally, zinc strips near the roof’s peak may also reduce the regrowth of algae, moss, and other biomass.
It’s recommended when cleaning your roof to use a low-pressure method versus using high-pressure spraying to prevent any damage to your roof. Most materials, including asphalt shingles and ceramic tiles, can be damaged from the high PSI pressure from the machines.
Most manufacturers suggest a soft-wash application process allowing soaps and solvents to attack and clean any algae, moss, lichen, or mildew on a roof. Once the soft wash is applied, it should be rinsed off thoroughly after it has had time to saturate the roofing material for a decent amount of time.