Most roof stains are caused by the growth of algae (which can harbor a number of molds), lichen colonies (fungus), or moss that feeds on the organic material like limestone that is frequently found in the mineral-based granules that make up roofing shingles. 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.
There are numerous reasons to protect your roof and rid it from these stains. Roof algae, lichens, and/or moss can eat through your shingles and into your roof deck causing wood rot. When the wood rots, moisture gets in through the cracks and creates an environment hospitable to mold growth. A roof covered with algae creates a situation where the granules on your shingles are no longer able to reflect sunlight efficiently, but instead absorb heat Super-heating your attic and increasing you cooling cost. Finally, restoring the beauty of your home is probably the most compelling reason to have your roof cleaned. A dirty roof detracts from your home’s curb appeal. A well maintained home needs a solid, reliable, attractive roof.
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