Commercial and Residential: Asphalt and Metal Roof Cleaning
Metal Roof Cleaning
Metal roofing is sometimes a process all it's own.
With metal we can get heavy discoloration from oxidation(a natural process that happens to aluminum). The way we treat it is with aggressive surfactants and in some cases brushing the roof with no marring soft bristled brushes to float off the oxidation. With this type of roof we are still using a low pressure process(can be read about more in paragraphs below) because of the gaskets around the screws attaching the metal sheeting to the roof(these are a soft rubber and sometimes silicone gasket that could be damaged with high pressure).
Asphalt Roof Cleaning
Your roof, if we are talking about black streaks and discoloration, is being overtaken by blue green algae named Gloeocapsa Magma. Gloeocapsa Magma is an air born algae that moves from roof to roof and common in most humid areas(typical dominance on North Facing structures). Best conditions for spread of this algae are humid, wet and/or shaded areas. Gloeocapsa Magma can act as a magnifying glass raising your roof temperature and as such increasing the energy costs by forcing the cooling system to run excessively. If the problem is not addressed this algae, it can cause granule loss and shorten the life span of your roof.
Our process: When cleaning an asphalt roof we follow the guide lines laid out and recommended by ARMA (Asphalt Roof Manufacturers Association) and all other major shingle manufacturers like GAF and Owens Corning. The process is a “Low Pressure” application of recommended cleaning detergents that is designed to safely remove any algae, moss, lichens. In the case of extreme lichen buildup we do however treat and recommend letting them detach in an organic matter after the detergents have an opportunity to do their work. Our process uses no more pressure than that of a standard garden hose. High pressure should NEVER be used on asphalt shingles because it will void warranty and cause tremedous irreversible damage.
When working around sensitive plants (such as Japanese Maple, some rose varieties, etc) we do cover and use a plant wash to neutralize and eliminate any potential for damages. We guarantee no damage to plantlife.
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