We have a 1960's style home with a tar and rock roof. There is quite a bit of moss on the roof, but the roof doesn't need replacing right now. We would like to know if we can just clean off the moss and rocks and not replace the rocks, or is there a real purpose for replacing the rocks. Also, what is the best way to clean the moss off the roof.
So now, if we are thinking of replacing the tar and rock roof, would it be a good idea to replace it with shingles?