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The black roof stains on asphalt roofs across the Midwest are caused by an airborne algae known as roof algae. This algae is becoming increasingly problematic in this region of the country and has been for several years now. Shingle manufacturers are trying to eradicate the problem by producing algae resistant shingles. There is still a lot of testing to get the results that they are looking for. We have seen many cases of algae resistant shingles suffering from black roof algae so certainly there is still some work to be done by the shingle manufacturers. Another helpful suggestion of the shingle manufacturers to help combat the roof algae problem is to recommend roof cleaners and roof cleaning methods. These guidelines are effective for restoring a roof’s appearance without harming the shingles. When done correctly, these roof cleaning techniques can be extremely effective and can keep algae away for years at a time. The method that is recommended by the shingle makers is a low pressure chemical application followed by a low pressure rinse and spot treatments if necessary. Caution should be taken to protect plants and landscaping. What is not suggested and is even warned against is the use of a pressure washer for cleaning roof algae off of asphalt shingles. High water pressure will blow away the shingle granules which are there to protect the shingles. This will definitely lessen the longevity of any asphalt shingle roof. Neglecting the black roof algae will also result in premature failure of asphalt shingles. The roof algae will only get worse if it is not taken care of and will raise home heating and cooling costs. Roof cleaning should be considered before a premature roof replacement as it can save you money. Roof cleaning usually costs about a tenth of the price of a total roof replacement and can completely restore your roof’s appearance when it is done correctly by a reputable roof cleaning company.
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