Q: I have lived in my house for 25 years. Just in the past couple of years, some kind of mold or mildew has formed on the vinyl siding on the north side of the house. Why is this happening, and what ...

This is mold and mildew on siding. It happens on siding of all types, including vinyl, wood and fiber cement. (Tim Carter) Perspective by Tim Carter Q: My house is 25 years old. It’s covered with ...