Quote:
Originally Posted by Dannny
Is it necessary? If so, how is that determined?
thanks
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Like so many things it is a matter of opinion. Roof shingles are tar with fine gravel on top.
The color is the color of the gravel. The gravel protects the tar underneath that people call roofing shingles. Washing the roof will remove some of the gravel. What people see is dirt is partly dirt and partly mold. As it is black, in color a light colored roof will show the dirt and mold more.
Our roof is dark colored. It is ten years old. There is some mold on it. If, I was selling, I would likely have it washed. Since, I am not selling I would not have it washed.