What are those ugly roof stains? Ugly roof stains are not caused by trees, birds, leaves, or pine needles. The stains are caused by the air-born spores from black algae, fungus and mold. The spores land on your roof and grow on the asphalt material the shingles are made from.
Why do the stains only grow on one side of my roof? Black algae usually grows on the North side of the home as well as areas under trees. The North side of the home gets the least amount of sun and therefore stays wet the longest. The same is true with the area under trees where there is the most shade and the trees drip rain water keeping the surface wet for longer. The moisture allows the algae to flourish.
Will the algae harm my shingles? Yes, if left untreated for long enough. Over time the algae growth can cause your shingles to dry, crack and curl. Leaks will result leading to premature roof replacement. With proper maintenance, your roof should last at least as long as the warranty period.
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