Dear James: Our three-year-old light-colored roof already has dark stains over most of it, except for near the chimney. Why is that, and how can we stop the staining from getting worse?—Phil R.
Dear Phil: Your roof-staining problem is not uncommon, especially with a light-colored roof where it is most noticeable. You made the correct choice in installing light-colored shingles, and the color is not causing the staining problem.
