Homeowners with concrete and asphalt driveways often deal with unwanted green patches of moss — that moss thrives in shady or damp areas. Growth can happen year-round, and while it may seem like 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 ...

Dear Jerry: I may have asked you sometime before, but I’d like your current recommendations for what's best to use to kill moss on a shady roof and lichens on a deck railing. Hopefully, the same ...