Today, most asphalt shingles begin with a dense mat glass fiber, shaped to the size of a shingle. The purpose of the fiberglass is to make the shingle sturdy, not waterproof. Adding a layer of asphalt to the fiberglass is what makes a shingle waterproof. Since asphalt will not adhere to fiberglass, manufacturers mix limestone fillers with the asphalt to form a bond to the fiberglass. The asphalt mixture then envelopes the fiberglass base, filling all voids and rendering the shingle utterly waterproof. The top layer of a shingle consists of ceramic granules embedded into a thin layer of adhesive asphalt.
Through weathering, the top layer of a shingle thins, leaving the organic filler vulnerable to mold and fungus growth. The most common reason for cleaning asphalt shingles is to remove fungus. Growths such as mold, fungi, and lichen feed on the limestone filler, causing shingles to break down and no longer serve as a waterproof barrier for your roof.
If your roof has tell-tale signs of fungus growth, then you need to clean your asphalt shingles. Do not wait until your entire roof becomes enveloped with thick growth. Before attempting to clean the shingles yourself, however, speak with the shingle manufacturer or the contractor who installed your roof. Different manufacturers will suggest different cleaning products and methods, and some will void your warranty if you use products or methods not approved by them. However, all roofing manufacturers agree that you should never use high pressure washers to clean your asphalt shingles since the force will strip away the ceramic granules and the top layer of asphalt, making your home vulnerable to water damage.
While most people call a contractor to clean their shingles, you can save the expense and do it yourself. Follow these steps to clean your asphalt shingles:
Visit your local home improvement store and discover the products available to protect asphalt singles. The 3M Corporation makes a product that prevents mold and mildew from growing on asphalt shingles. Always take extreme care when you work on your roof. The mold and mildew create slippery conditions when you add water. As a safety measure, it is best to work with another person when you clean your asphalt shingles.
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