Q. I live in a mansard-style home with shingles down the entire second floor. On the east side of the roof, lichens have established quite a home. Without ruining the fiberglass shingles, how do I ...

Dear Jerry: Our house was recently painted, and the contractor told us that the roof shingles on the north side have mold that should be removed. The house was built in 1966 and has the third roof on ...

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 ...

Q. I have a 10-foot-by-12-foot tool shed in a shady area with a roof covered with unsightly lichen. Can you suggest any relatively simple way to remove it before I paint the shed? A. Ah, yes, lichen ...

Q I have a six-year-old asphalt shingle roof with a patch of moss on the north side. Is there a safe and effective way to remove it? A It's unlikely to be moss. That usually takes longer than six ...