Why is my white roof turning black? Three reasons, food, water and shelter, caused by an algae, scientifically known as gloeocapsa magma. Once present in an area, the algae can quickly spread by airborne spores. The water source is a combination of the humidity in the air and the time your roof takes to dry after it rains, have you ever wondered why the black stains start most of the time at the bottom near the gutter. The food source is a combination of the limestone and particles in the air that cling to your roof and the shelter is the lack of sun, have you ever noticed the stains are mostly in the shade or the North side of the house. It is important to maintain a clean roof for the aesthetic value and curb appeal, but also to provide protection against building degradation. When mold, mildew, algae and other environmental pollutants are allowed to remain on the exterior surfaces of a roof surface it will contribute to premature shingle failure and can also cause permanent staining. How long can I expect my roof to stay clean? Each and every property is its own unique situation. Roof surfaces can stay clean for up to three years or longer. There are many factors and variables. Trees can cause shade for instance, and will create damp areas, creating an ideal environment for algae and mildew to develop and thrive in. Unusually dry or damp weather conditions can also have a direct effect on the length of time that a roof surface will stay clean. Main Causes of Roof deterioration Moss and Algae - Moss can grow on your roof if they are kept moist by poor sunlight conditions or bad drainage. Once it grows, moss holds even more moisture to the roof surface, causing rot, and its roots actually work their way into the wood. Algae also grows in damp, shaded areas on asphalt shingle roofs. Besides creating an ugly black-green stain, it can retain moisture, causing rot and deterioration. Trees and bushes should be trimmed away from the house to eliminate damp, shaded areas, and gutters should be kept clean to ensure good drainage. Tree and Leaves - Tree branches touching the roof will scratch and gouge the roof material as they are blown back and forth by the wind. Falling branches from overhanging trees can damage-or even puncture-shingles and other roof materials. Leaves on the roof surface retain moisture and cause rot, and leaves in the gutters block drainage. Sun - Heat and ultraviolet rays cause roofing materials to deteriorate over time. Rain - When water gets underneath the shingles, shakes or other roofing materials, it can work its way to the deck and cause the roof structure to rot. And, the extra moisture encourages mildew and rot elsewhere in the house, including damaged walls, ceilings, insulation and even the electrical system. Roof Cleaning Northern Virginia
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