Roof soft washing does more than just make your roof look better, it can actually add years to its life-span. As your roof ages, especially if parts of it are shaded for extended periods of the day, mold, algae, and mildew take up residence on the tiles and proliferate across the surface. Because the climate of Cypress, Katy, Tomball, and Northwest Houston are so humid and the roofs here are predominantly constructed using asphalt shingles, algae and mold buildup is almost inevitable. A particular strain of algae (Gloeocapsa magma) commonherefeed on the limestone filler used asphalt shingles and can cause substantial decay.