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: On many roofs with asphalt shingles I notice black streaks. New light-colored orange-red asphalt shingles were installed on our roof about six years ago, and now I notice the dark streaks forming.

My roof has skid marks. And lichens. Next thing you know, it could grow a mossy beard. What's going on here? And more important, what can I do about it? You might be wondering the same thing, if your ...

If you've noticed dark streaks and stains on your home's roof, now's the time to take action before more damage is done. These stains are caused by algae, moss, mildew, bird droppings and other ...

Q: Many of the homes in our subdivision are 12 to 15 years old. In the last couple of years, I have noticed that many roofs, including our own, have dark stains flowing down one side or another. The ...

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 ...