Cleaning Black Roof Algae Tampa Florida At A Glance

Roof algae, not mildew or fungi, causes the black streaking often seen on homes in areas where moisture collects on shingles. Gloeocapsa Magma has been described as the most common type by 3M scientists. Algae spores are borne by the wind, which is why this issue can affect so many homes in a community. This particular algae strain has become more hardy over the last 20 years, allowing it to adapt to less humid conditions than in the past. In areas where it has previously been observed, the staining occurs earlier, is more intense, and settles on a larger number of roofs. If you would like to learn more about this, read more.

Pressure cleaning or chemical solutions containing Chlorine Bleach or Sodium Hydroxide are common roof cleaning methods. These techniques can clean the roof with minimal negative impact if used properly, but the results are only temporary and will need to be replicated every 6-18 months to keep the roof looking good.

A chlorine and water solution, followed by a thorough rinse, can be used. Of course, since chlorine is toxic to humans and plants, extra measures should be taken to protect workers and the surrounding environment from overspray and runoff. When compared to other processes, the advantages of using chlorine include a much quicker washing process and less rinsing. This means the roof – particularly asphalt shingle roofs – will last much longer.

While sodium hydroxide-based cleaners are commonly marketed as being safer for landscaping, sodium hydroxide is caustic and highly toxic, so extra caution should be taken to protect workers and surrounding property. Sodium hydroxide functions well as a degreaser as well. As a result, high levels of sodium hydroxide in a cleaning product can cause permanent damage to an asphalt shingle roof. These products normally necessitate a lot more rinsing than chlorine-based products. Not only is the rinsing process time-consuming, but it can also be harmful to the roof if not performed correctly. To effectively rinse an asphalt shingle roof, a quality sodium hydroxide-based product should not require more than 100 psi, and even then, some granule loss should be expected.

Pressure cleaning is only recommended for concrete, barrel tile, or metal roofs. Pressure washing has the benefit of not needing chemicals, which cuts down on costs as well as concerns over chemical contamination and landscaping. The downside of pressure cleaning is that it takes a long time and exerts a lot of energy on a surface that isn’t built to handle it. Furthermore, constant pressure cleaning will wear away the surface of some tiles with just a thin layer of colouring. When this happens, the grey concrete colour tends to show through, necessitating the staining or painting of the roof.