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DEAR TIM: 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 ...

Q: I have a newer asphalt shingle roof, but parts of it are covered with moss, lichens and algae. Is a pressure washer the best choice for cleaning roof shingles? Will it remove all of this growth?

Q. In the past year my asphalt shingle roof seems like it has really started to go bad. I see large areas of my shingles that have no granules. You can see the fiberglass fibers in the mat. The ...

QDEAR TIM: My roof needs cleaning. It's a newer asphalt shingle roof, but parts of it are covered with moss, lichens and algae. Is a pressure washer a good tool for cleaning roof shingles? Will it ...

High-pressure water can do serious damage in seconds.

Q: We have a “green roof” that is not meant to be green. Moss (I guess it is moss) is collecting on one side of the asphalt roof. The roof is otherwise in good shape. What I have learned so far is ...

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 ...