Have noticed a fair amount of greenish Mold (or Moss ?) on shingles in some areas of my roof.
Live in New England; gets quite cold up here during the winter.
- Is it harmful for the Shingles ? (my primary question and concern)
- Will the cold temp. kill the stuff over the winter ?
- Will it rejuvenate itself in the Spring ? Or, just new patches in other areas likely ?
What causes ?
If it is really necessary to treat before the winter sets in, and I can get up there to spray it with something, what's good to use that won't harm the Shingles ?
Would prefer, I think, a commercial product rather than mixing something up myself.