Most roof stains are caused by the growth of algae, lichen colonies or moss that feed on the organic material found in the granules that make up roofing shingles, mainly limestone. This organic matter is the food source for these roof staining organisms. These organisms are literally eating your roof. The portions of a roof that receive the least amount of sunlight are more likely to have algae, lichen colonies, or moss growth. This explains why some homes may have roof stains only on one side of the roof, typically the northern and/or western exposure or in heavily shaded areas.
What is the ALGAE on my Roof
Algae is a living organism that thrives on dust, pollen, and the organic materials that make up the roof. Dampness triggers its growth. Stains are usually more prominent on northern and western exposures and in heavily shaded areas. Algae grows on, under, and behind the tiny granules that cover the shingles. This results in unsightly stains and streaks on the roof. Roofs with algae stains absorb heat rather than reflect it, resulting in a super-heated attic and higher home cooling costs as well as reducing the natural life span of the shingles.
About MOSS on your Roof
Thick moss growth with its shallow root system keeps the roofing materials damp for extended periods of time. This moisture promotes wood rot and causes erosion of the shingles. Moss typically starts to grow at the top of the vertical slots between the shingles. These areas of asphalt shingles are the last place water evaporates from a roof. Moss, like lichen colonies, is quite damaging to shingles and some of the granules underneath the moss be already be gone.
LICHEN COLONIES on your Roof
Lichens are a fungus, that grow with algae, resulting in a composite organism that characteristically forms a crust-like or branching growth on shingle granules. Lichens put out root-like tentacles that penetrate deep into the shingle’s organic, oil base for nourishment, eventually ruining them by creating dark spots, or pock marks where they grow. Call A. Oliveri Siding and Remodeling to clean your Dirty Roof. We gently clean your roof without the use of a power washer. We apply our special blend of detergent to clean your roof and make it look new again. We are fully Licensed and Insured. We also offer a 2 year Spot Free Warrantee on your Soft Wash Roof Cleaning. Call Today 631-588-5032 or visit our website @ www.softwashli.com
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A. Oliveri Soft Wash Roof Cleaning 631-588-5032 www.SoftWashLI.com Servicing Suffolk County NY Roof Algae: Black Streaks your Shingles Black streaks running down your roof aren't a sign that the asphalt shingles are dissolving or that you need a new roof. Rather, you have roof algae. The organisms arrive on the rooftop as either spores or clumps of cells. If they land on the north side of the roof, where the sun is less harsh and moisture more plentiful, the algae will have a good environment to multiply, spreading in a delta down the slope of the roof. Asphalt shingles contain limestone, which makes them heavy, durable and reflective. Roof algae over time will slowly consume the limestone, ultimately weakening the shingles. Algae cells produce a dark pigment that...
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