A green, moss-covered roof may make you think you’ve wandered into a fairy tale, complete with a quaint little woodcutter’s cottage. But, in the real world, moss is much less a fantasy than it is a ...

Q. Many roofs in my neighborhood, mine included, are covered with black streaks. What's causing this to happen, and can the roofs be cleaned? I'm able to walk on my asphalt shingle roof with ease, but ...

Part of my roof gets very little direct sun. Both moss and green and black algae grow on the shingles. Are these organisms damaging my roof? What is the best way to remove them? Is there a permanent ...

Many roofs in my neighborhood, mine included, are covered with black streaks. What’s causing this to happen, and can the roofs be cleaned? I’m able to walk on my asphalt shingle roof with ease but am ...